Difference between revisions of "Mystrium rogeri"

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m (Text replacement - "|subfamilia = Amblyoponinae |genus = ''Mystrium''" to "|subfamilia = Amblyoponinae |tribus = Amblyoponini |genus = ''Mystrium''")
 
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|familia = [[Formicidae]]
 
|familia = [[Formicidae]]
 
|subfamilia = [[Amblyoponinae]]
 
|subfamilia = [[Amblyoponinae]]
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|tribus = [[Amblyoponini]]
 
|genus = ''[[Mystrium]]''
 
|genus = ''[[Mystrium]]''
 
|species group = ''mysticum''
 
|species group = ''mysticum''
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[[:File:Mystrium rogeri casent0000760 label 1.jpg|Specimen labels]]|Specimen labels
 
[[:File:Mystrium rogeri casent0000760 label 1.jpg|Specimen labels]]|Specimen labels
 
}}
 
}}
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''Mystrium'' are predators that specialize on large centipedes. ''Mystrium rogeri'' colonies have a single dealate queen and average 94 workers. Nests are found in rotten logs (Molet et al. 2007).
 +
 +
{{Photo Gallery
 +
|name1=Mystrium rogeri Queen workers Peeters.jpg
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|comment1=Dealate queen and workers of ''M. rogeri'', showing weak dimorphism in body size. Photo by Patrick Landmann.
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|name2=Mystrium rogeri Larvae feeding Landmann.jpg
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|comment2=Older larvae feeding directly on a mealworm in the laboratory. Photo by Patrick Landmann.
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|name3=Mystrium rogeri Expt. nest Landmann.jpg
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|comment3=Observation nest showing workers and all brood stages. Photo by Patrick Landmann.
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|name4=Mystrium rogeri cocoon spinning Landmann.jpg
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|comment4=Newly spun cocoon with pupating larva inside. Debris used as scaffolding have not been completely removed by workers yet. Photo by Patrick Landmann.
 +
}}
 +
 
==Identification==
 
==Identification==
[[Key to Malagasy Mystrium Species|Key to Malagasy ''Mystrium'' Species]]
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The females of ''Mystrium rogeri'' can be distinguished easily from other ''Mystrium'' females by the combination of a distinct longitudinal carina on the central portion of the labrum or a single lateral spine on abdominal sternum VII, and the straight anterior margin of the clypeus. In addition to these diagnostic characters, a combination of unsculptured and smooth areas on the ventral portion of the vertex and the straight anterior clypeal margin separates ''Mystrium rogeri'' from the other ''Mystrium'' species workers; and a larger-sized alate queen (HW>1.99) with spatulate setae on the pronotal dorsum separate ''M. rogeri'' from the queens of other species. For males, the small eye and small ocelli that are separated from each other by a distance of more than 3 × the maximum diameter of lateral ocellus, petiolar dorsum and abdominal tergum VIII with rough and deep punctures, and less developed basoventral expansion of aedeagus separate M. rogeri from the other Mystrium males in the Malagasy region. (Yoshimura and Fisher 2014)
  
The females of ''Mystrium rogeri'' can be distinguished easily from other ''Mystrium'' females by the combination of a distinct longitudinal carina on the central portion of the labrum or a single lateral spine on abdominal sternum VII, and the straight anterior margin of the clypeus. In addition to these diagnostic characters, a combination of unsculptured and smooth areas on the ventral portion of the vertex and the straight anterior clypeal margin separates ''Mystrium rogeri'' from the other ''Mystrium'' species workers; and a larger-sized alate queen (HW>1.99) with spatulate setae on the pronotal dorsum separate ''M. rogeri'' from the queens of other species. For males, the small eye and small ocelli that are separated from each other by a distance of more than 3 × the maximum diameter of lateral ocellus, petiolar dorsum and abdominal tergum VIII with rough and deep punctures, and less developed basoventral expansion of aedeagus separate M. rogeri from the other Mystrium males in the Malagasy region. (Yoshimura and Fisher 2014)
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{{Species identification keys}}
  
 
==Distribution==
 
==Distribution==
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<!--END OF DISTRIBUTION LIST-->
 
<!--END OF DISTRIBUTION LIST-->
  
{{Google Maps||-19|46|5}}
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{{AntMapsMap}}
 
==Biology==
 
==Biology==
Queens in this species are larger than workers, have normally developed wings upon eclosion, and exhibit fully developed worker-like mandibles. When founding a new colony these queens may forage for food; presumably non-claustral independant nest founding is the main mode of colony founding. Dissected workers and queens were found to have four ovarioles per ovary with from 1 to 15 mature oocytes per ovary. Most worker have ovarioles with no oocytes but this is not absolute. Some workers do possess oocytes and presumably are able to lay some male eggs. No workers were found to be mated. (Molet et al. 2007)
+
Workers vary greatly in body size, and this corresponds to differences in mandible shape. Queens are larger than the biggest workers, with normal wings upon eclosion. When founding a new colony these queens may forage for food; this is termed non-claustral independent colony founding. Dissected workers and queens were found to have four ovarioles per ovary with 1-15 mature oocytes per ovary. Most workers have ovarioles lacking oocytes. Some workers have yolky oocytes and presumably are able to lay some male eggs. No workers were found to be inseminated. (Molet et al. 2007)
  
 
==Castes==
 
==Castes==
 +
===Worker===
 
<gallery perrow=4 caption='The following images are provided by AntWeb'>
 
<gallery perrow=4 caption='The following images are provided by AntWeb'>
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File:Mystrium rogeri casent0003309 head 1.jpg|Head view
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File:Mystrium rogeri casent0003309 profile 1.jpg|Side view
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File:Mystrium rogeri casent0003309 dorsal 1.jpg|Top view
 +
File:Mystrium rogeri casent0003309 label 1.jpg|Specimen labels
 
File:Mystrium rogeri casent0003308 head 1.jpg|Head view
 
File:Mystrium rogeri casent0003308 head 1.jpg|Head view
 
File:Mystrium rogeri casent0003308 profile 1.jpg|Side view
 
File:Mystrium rogeri casent0003308 profile 1.jpg|Side view
 
File:Mystrium rogeri casent0003308 dorsal 1.jpg|Top view
 
File:Mystrium rogeri casent0003308 dorsal 1.jpg|Top view
 
File:Mystrium rogeri casent0003308 label 1.jpg|Specimen labels
 
File:Mystrium rogeri casent0003308 label 1.jpg|Specimen labels
File:Mystrium rogeri casent0003309 head 1.jpg|Head view
 
File:Mystrium rogeri casent0003309 profile 1.jpg|Side view
 
File:Mystrium rogeri casent0003309 dorsal 1.jpg|Top view
 
File:Mystrium rogeri casent0003309 label 1.jpg|Specimen labels
 
 
File:Mystrium rogeri casent0003310 head 1.jpg|Head view
 
File:Mystrium rogeri casent0003310 head 1.jpg|Head view
 
File:Mystrium rogeri casent0003310 profile 1.jpg|Side view
 
File:Mystrium rogeri casent0003310 profile 1.jpg|Side view
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File:Mystrium rogeri casent0003806 dorsal 1.jpg|Top view
 
File:Mystrium rogeri casent0003806 dorsal 1.jpg|Top view
 
File:Mystrium rogeri casent0003806 label 1.jpg|Specimen labels
 
File:Mystrium rogeri casent0003806 label 1.jpg|Specimen labels
File:Mystrium rogeri casent0007826 head 1.jpg|Head view
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File:Mystrium rogeri casent0101670 head 1.jpg|Head view
File:Mystrium rogeri casent0007826 profile 1.jpg|Side view
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File:Mystrium rogeri casent0101670 profile 1.jpg|Side view
File:Mystrium rogeri casent0007826 profile 2.jpg
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File:Mystrium rogeri casent0101670 dorsal 1.jpg|Top view
File:Mystrium rogeri casent0007826 profile 3.jpg
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File:Mystrium rogeri casent0101670 label 1.jpg|Specimen labels
File:Mystrium rogeri casent0007826 dorsal 1.jpg|Top view
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File:Mystrium rogeri casent0102172 head 1.jpg|Head view
File:Mystrium rogeri casent0007826 label 1.jpg|Specimen labels
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File:Mystrium rogeri casent0102172 profile 1.jpg|Side view
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File:Mystrium rogeri casent0102172 dorsal 1.jpg|Top view
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File:Mystrium rogeri casent0102172 label 1.jpg|Specimen labels
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File:Mystrium rogeri casent0135223 head 1.jpg|Head view
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File:Mystrium rogeri casent0135223 profile 1.jpg|Side view
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File:Mystrium rogeri casent0135223 dorsal 1.jpg|Top view
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File:Mystrium rogeri casent0135223 label 1.jpg|Specimen labels
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File:Mystrium rogeri casent0136702 head 1.jpg|Head view
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File:Mystrium rogeri casent0136702 profile 1.jpg|Side view
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File:Mystrium rogeri casent0136702 dorsal 1.jpg|Top view
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File:Mystrium rogeri casent0136702 label 1.jpg|Specimen labels
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File:Mystrium rogeri casent0172602 head 1.jpg|Head view
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File:Mystrium rogeri casent0172602 profile 1.jpg|Side view
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File:Mystrium rogeri casent0172602 dorsal 1.jpg|Top view
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File:Mystrium rogeri casent0172602 label 1.jpg|Specimen labels
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File:Mystrium rogeri casent0429930 head 1.jpg|Head view
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File:Mystrium rogeri casent0429930 profile 1.jpg|Side view
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File:Mystrium rogeri casent0429930 dorsal 1.jpg|Top view
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File:Mystrium rogeri casent0429930 label 1.jpg|Specimen labels
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File:Mystrium rogeri casent0429933 head 1.jpg|Head view
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File:Mystrium rogeri casent0429933 profile 1.jpg|Side view
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File:Mystrium rogeri casent0429933 dorsal 1.jpg|Top view
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File:Mystrium rogeri casent0429933 label 1.jpg|Specimen labels
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File:Mystrium rogeri casent0429953 head 1.jpg|Head view
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File:Mystrium rogeri casent0429953 profile 1.jpg|Side view
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File:Mystrium rogeri casent0429953 dorsal 1.jpg|Top view
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File:Mystrium rogeri casent0429953 label 1.jpg|Specimen labels
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File:Mystrium rogeri casent0429955 head 1.jpg|Head view
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File:Mystrium rogeri casent0429955 profile 1.jpg|Side view
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File:Mystrium rogeri casent0429955 dorsal 1.jpg|Top view
 +
File:Mystrium rogeri casent0429955 label 1.jpg|Specimen labels
 
File:Mystrium rogeri casent0009349 head 1.jpg|Head view
 
File:Mystrium rogeri casent0009349 head 1.jpg|Head view
 
File:Mystrium rogeri casent0009349 profile 1.jpg|Side view
 
File:Mystrium rogeri casent0009349 profile 1.jpg|Side view
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File:Mystrium rogeri casent0009969 dorsal 2.jpg
 
File:Mystrium rogeri casent0009969 dorsal 2.jpg
 
File:Mystrium rogeri casent0009969 label 1.jpg|Specimen labels
 
File:Mystrium rogeri casent0009969 label 1.jpg|Specimen labels
File:Mystrium rogeri casent0101670 head 1.jpg|Head view
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</gallery>
File:Mystrium rogeri casent0101670 profile 1.jpg|Side view
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===Queen===
File:Mystrium rogeri casent0101670 dorsal 1.jpg|Top view
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<gallery perrow=4 caption='The following images are provided by AntWeb'>
File:Mystrium rogeri casent0101670 label 1.jpg|Specimen labels
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File:Mystrium rogeri casent0490713 head 1.jpg|Head view
File:Mystrium rogeri casent0102172 head 1.jpg|Head view
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File:Mystrium rogeri casent0490713 profile 1.jpg|Side view
File:Mystrium rogeri casent0102172 profile 1.jpg|Side view
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File:Mystrium rogeri casent0490713 profile 2.jpg
File:Mystrium rogeri casent0102172 dorsal 1.jpg|Top view
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File:Mystrium rogeri casent0490713 dorsal 1.jpg|Top view
File:Mystrium rogeri casent0102172 label 1.jpg|Specimen labels
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File:Mystrium rogeri casent0490713 label 1.jpg|Specimen labels
File:Mystrium rogeri casent0135223 head 1.jpg|Head view
 
File:Mystrium rogeri casent0135223 profile 1.jpg|Side view
 
File:Mystrium rogeri casent0135223 dorsal 1.jpg|Top view
 
File:Mystrium rogeri casent0135223 label 1.jpg|Specimen labels
 
File:Mystrium rogeri casent0136702 head 1.jpg|Head view
 
File:Mystrium rogeri casent0136702 profile 1.jpg|Side view
 
File:Mystrium rogeri casent0136702 dorsal 1.jpg|Top view
 
File:Mystrium rogeri casent0136702 label 1.jpg|Specimen labels
 
 
File:Mystrium rogeri casent0146246 profile 1.jpg|Side view
 
File:Mystrium rogeri casent0146246 profile 1.jpg|Side view
 
File:Mystrium rogeri casent0146246 profile 2.jpg
 
File:Mystrium rogeri casent0146246 profile 2.jpg
 
File:Mystrium rogeri casent0146246 dorsal 1.jpg|Top view
 
File:Mystrium rogeri casent0146246 dorsal 1.jpg|Top view
 
File:Mystrium rogeri casent0146246 label 1.jpg|Specimen labels
 
File:Mystrium rogeri casent0146246 label 1.jpg|Specimen labels
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</gallery>
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===Male===
 +
<gallery perrow=4 caption='The following images are provided by AntWeb'>
 +
File:Mystrium rogeri casent0007826 head 1.jpg|Head view
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File:Mystrium rogeri casent0007826 profile 1.jpg|Side view
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File:Mystrium rogeri casent0007826 profile 2.jpg
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File:Mystrium rogeri casent0007826 profile 3.jpg
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File:Mystrium rogeri casent0007826 dorsal 1.jpg|Top view
 +
File:Mystrium rogeri casent0007826 label 1.jpg|Specimen labels
 
File:Mystrium rogeri casent0147379 head 1.jpg|Head view
 
File:Mystrium rogeri casent0147379 head 1.jpg|Head view
 
File:Mystrium rogeri casent0147379 profile 1.jpg|Side view
 
File:Mystrium rogeri casent0147379 profile 1.jpg|Side view
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File:Mystrium rogeri casent0147379 dorsal 1.jpg|Top view
 
File:Mystrium rogeri casent0147379 dorsal 1.jpg|Top view
 
File:Mystrium rogeri casent0147379 label 1.jpg|Specimen labels
 
File:Mystrium rogeri casent0147379 label 1.jpg|Specimen labels
File:Mystrium rogeri casent0172602 head 1.jpg|Head view
 
File:Mystrium rogeri casent0172602 profile 1.jpg|Side view
 
File:Mystrium rogeri casent0172602 dorsal 1.jpg|Top view
 
File:Mystrium rogeri casent0172602 label 1.jpg|Specimen labels
 
File:Mystrium rogeri casent0429930 head 1.jpg|Head view
 
File:Mystrium rogeri casent0429930 profile 1.jpg|Side view
 
File:Mystrium rogeri casent0429930 dorsal 1.jpg|Top view
 
File:Mystrium rogeri casent0429930 label 1.jpg|Specimen labels
 
File:Mystrium rogeri casent0429933 head 1.jpg|Head view
 
File:Mystrium rogeri casent0429933 profile 1.jpg|Side view
 
File:Mystrium rogeri casent0429933 dorsal 1.jpg|Top view
 
File:Mystrium rogeri casent0429933 label 1.jpg|Specimen labels
 
File:Mystrium rogeri casent0429953 head 1.jpg|Head view
 
File:Mystrium rogeri casent0429953 profile 1.jpg|Side view
 
File:Mystrium rogeri casent0429953 dorsal 1.jpg|Top view
 
File:Mystrium rogeri casent0429953 label 1.jpg|Specimen labels
 
File:Mystrium rogeri casent0429955 head 1.jpg|Head view
 
File:Mystrium rogeri casent0429955 profile 1.jpg|Side view
 
File:Mystrium rogeri casent0429955 dorsal 1.jpg|Top view
 
File:Mystrium rogeri casent0429955 label 1.jpg|Specimen labels
 
File:Mystrium rogeri casent0490713 head 1.jpg|Head view
 
File:Mystrium rogeri casent0490713 profile 1.jpg|Side view
 
File:Mystrium rogeri casent0490713 profile 2.jpg
 
File:Mystrium rogeri casent0490713 dorsal 1.jpg|Top view
 
File:Mystrium rogeri casent0490713 label 1.jpg|Specimen labels
 
File:Mystrium rogeri sam-ent-011507 head 1.jpg|Head view
 
File:Mystrium rogeri sam-ent-011507 profile 1.jpg|Side view
 
File:Mystrium rogeri sam-ent-011507 dorsal 1.jpg|Top view
 
File:Mystrium rogeri sam-ent-011507 label 1.jpg|Specimen labels
 
 
</gallery>
 
</gallery>
  
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*Holldobler, B., Obermayer, M. & Alpert, G.D. 1998. Chemical trail communication in the amblyopone species ''Mystrium rogeri'' Forel (Hymenoptera, Formicidae, Ponerinae). Chemoecology. 8:119–123.
 
*Holldobler, B., Obermayer, M. & Alpert, G.D. 1998. Chemical trail communication in the amblyopone species ''Mystrium rogeri'' Forel (Hymenoptera, Formicidae, Ponerinae). Chemoecology. 8:119–123.
 
*Menozzi, C. 1929e.  Revisione delle formiche del genere Mystrium Roger. Zool. Anz. 82: 518-536 (page 527, queen, male described)
 
*Menozzi, C. 1929e.  Revisione delle formiche del genere Mystrium Roger. Zool. Anz. 82: 518-536 (page 527, queen, male described)
 +
*Molet, M., Peeters, C. & Fisher, B.L. 2007. Winged queens replaced by reproductives smaller than workers in Mystrium ants. Naturwissenschaften. 94:280-287.
 +
*Molet, M., B. L. Fisher, F. Ito, and C. Peeters. 2009. Shift from independent to dependent colony foundation and evolution of 'multi-purpose' ergatoid queens in Mystrium ants (subfamily Amblyoponinae). Biol. J. Linn. Soc. 98:198-207.
 
*[[Media:Yoshimura, M. & Fisher, B.L. 2014. A revision of the ant genus Mystrium in the Malagasy region with description of six new species and remarks on Amblyopone and Stigmatomma.pdf|Yoshimura, M. & Fisher, B.L. 2014. A revision of the ant genus ''Mystrium'' in the Malagasy region with description of six new species and remarks on ''Amblyopone'' and ''Stigmatomma'' (Hymenoptera, Formicidae, Amblyoponinae). ZooKeys 394, 1–99.]]
 
*[[Media:Yoshimura, M. & Fisher, B.L. 2014. A revision of the ant genus Mystrium in the Malagasy region with description of six new species and remarks on Amblyopone and Stigmatomma.pdf|Yoshimura, M. & Fisher, B.L. 2014. A revision of the ant genus ''Mystrium'' in the Malagasy region with description of six new species and remarks on ''Amblyopone'' and ''Stigmatomma'' (Hymenoptera, Formicidae, Amblyoponinae). ZooKeys 394, 1–99.]]
  
{{Stub}}
 
 
[[category:Species]]
 
[[category:Species]]
 
[[category:Extant species]]
 
[[category:Extant species]]
[[category:Formicidae]][[category:Amblyoponinae]][[category:Mystrium]][[category:Mystrium rogeri]]
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[[category:Formicidae]][[category:Amblyoponinae]][[category:Amblyoponini]][[category:Mystrium]][[category:Mystrium rogeri]]
[[category:Amblyoponinae species]][[category:Mystrium species|rogeri]]
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[[category:Amblyoponinae species]][[category:Amblyoponini species]][[category:Mystrium species|rogeri]]
 
[[category:Need Overview]][[category:Need Body Text]]
 
[[category:Need Overview]][[category:Need Body Text]]
 +
[[Category:Ssr]]

Latest revision as of 21:35, 16 December 2019

Mystrium rogeri
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Amblyoponinae
Tribe: Amblyoponini
Genus: Mystrium
Species group: mysticum
Species: M. rogeri
Binomial name
Mystrium rogeri
Forel, 1899

Mystrium rogeri casent0000760 profile 1.jpg

Mystrium rogeri casent0000760 dorsal 1.jpg

Specimen labels

Mystrium are predators that specialize on large centipedes. Mystrium rogeri colonies have a single dealate queen and average 94 workers. Nests are found in rotten logs (Molet et al. 2007).


Photo Gallery

  • Dealate queen and workers of M. rogeri, showing weak dimorphism in body size. Photo by Patrick Landmann.
  • Older larvae feeding directly on a mealworm in the laboratory. Photo by Patrick Landmann.
  • Observation nest showing workers and all brood stages. Photo by Patrick Landmann.
  • Newly spun cocoon with pupating larva inside. Debris used as scaffolding have not been completely removed by workers yet. Photo by Patrick Landmann.

Identification

The females of Mystrium rogeri can be distinguished easily from other Mystrium females by the combination of a distinct longitudinal carina on the central portion of the labrum or a single lateral spine on abdominal sternum VII, and the straight anterior margin of the clypeus. In addition to these diagnostic characters, a combination of unsculptured and smooth areas on the ventral portion of the vertex and the straight anterior clypeal margin separates Mystrium rogeri from the other Mystrium species workers; and a larger-sized alate queen (HW>1.99) with spatulate setae on the pronotal dorsum separate M. rogeri from the queens of other species. For males, the small eye and small ocelli that are separated from each other by a distance of more than 3 × the maximum diameter of lateral ocellus, petiolar dorsum and abdominal tergum VIII with rough and deep punctures, and less developed basoventral expansion of aedeagus separate M. rogeri from the other Mystrium males in the Malagasy region. (Yoshimura and Fisher 2014)

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Afrotropical Region: Comoros.
Malagasy Region: Madagascar (type locality).


Distribution based on AntMaps

AntMapLegend.png

Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Workers vary greatly in body size, and this corresponds to differences in mandible shape. Queens are larger than the biggest workers, with normal wings upon eclosion. When founding a new colony these queens may forage for food; this is termed non-claustral independent colony founding. Dissected workers and queens were found to have four ovarioles per ovary with 1-15 mature oocytes per ovary. Most workers have ovarioles lacking oocytes. Some workers have yolky oocytes and presumably are able to lay some male eggs. No workers were found to be inseminated. (Molet et al. 2007)

Castes

Worker

Queen

Male

Nomenclature

The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • rogeri. Mystrium rogeri Forel, 1899b: 304 (w.) MADAGASCAR. Menozzi, 1929d: 527 (q.m.).

Type Material

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.

Description

Worker

Yoshimura and Fisher (2014) - Measurements: lectotype. HL 1.87, HW 1.85, SL 1.13, ML 1.72, HD 1.24, WL 2.09, PnW 1.14, PpW 0.98, PtW 0.92, PtL 0.53, CI 98.7, SI 61.4, MI 93.3, PpI 86.5, PtI 174.6.

HL 1.19–2.27, HW 1.12–2.28, SL 0.70–1.37, ML 1.18–2.38, HD 0.83–1.47, WL 0.18–2.52, PnW 0.67–1.23, PpW 0.57–1.05, PtW 0.51–1.04, PtL 0.33–0.65, CI 93.9–101.4, SI 59.2–64.6, MI 90.9–105.7, PpI 79.3–90.1, PtI 153.1–182.6 (10 specimens measured).

Posterolateral corner of head strongly expanding posteriorly. Posterior face of vertex forming slightly blunt angle with dorsal face on median line of head, so that declivity of vertex on lateral part slightly steeper than on median part. Ventral half of vertex smooth and not sculptured. Eye small to moderately small. Anterior margin of clypeus straight or weakly concave and with small conical setae. Genal tooth of head undeveloped, but anterolateral corner of head angulate. Masticatory margin of mandible narrowly visible in full-face view, and difference in width of dorsal surface of mandible relatively small between mandibular shaft and distal portion. Second maxillary palpomere longer than third. First flagellomere (third antennal segment) as long as pedicel (second antennal segment). Shallow and fine longitudinal striae irregularly impressed on central part of pronotal dorsum, and sometimes shallowly reticulated around those striae. On lateral surface of pronotum, deep, fine longitudinal striae impressed and wide and deep punctures arranged on central horizontal line. Mesonotum differentiated from propodeum in dorsal view, length as long as that of propodeum in large individuals, shorter than propodeum in small individuals. Metanotal groove shallowly impressed, mesonotum in lateral view as high as pronotum in large individuals, higher than pronotum in small individuals. Metanotum weakly developed in largest individuals. Metapleural gland bulla developed, so that propodeal declivity in lateral view weakly convex posteriorly on ventral portion. Petiole in dorsal view moderately narrow, relatively narrower than that of M. mysticum.

Body color brown to black.

Queen

Yoshimura and Fisher (2014) - Measurements: HL 1.94–2.31, HW 1.99–2.40, SL 1.20– 1.42, ML 1.87–2.48, HD 1.29–1.51, WL 2.78–3.31, MnW 1.42–1.83, PtW 1.03– 1.32, PtL 0.61–0.78, CI 99.8–104.2, SI 58.1–62.8, MI 90.4–103.1, MnI 68.1–76.1, PtI 155.3–185.1 (10 specimens measured).

Wings usually present and well developed; but lacking in intercaste. Wing sclerites fully developed even if wings have dropped off in queen; developed to undeveloped in variable degrees in intercaste. Posterolateral corner of head strongly expanding posteriorly, expansion not differentiated from that of workers. Posterior face of vertex forming slightly blunt angle with dorsal face on median line of head, so that declivity of vertex on lateral part slightly steeper than on median part. Ventral half of vertex smooth and not sculptured. Eye well developed. Both anterior and lateral ocelli clearly present in queen; ocelli varied from absent to developed in intercaste. Anterior margin of clypeus straight or weakly concave with small conical setae. Anterolateral portion of head weakly to strongly angulate or with short spine. Masticatory margin of mandible narrowly, slightly visible in full-face view, dorsal surface on distal portion moderately wider than on mandibular shaft, difference in width much smaller than that in M. mysticum. Teeth always present on whole mandibular shaft. Spatulate seta present on basal side of each basal denticle on masticatory margin of mandible. First flagellar segment on antenna as long as pedicel. Setae on pronotum spatulate, widened distally with sharp or blunt apex. Propodeal declivity in lateral view almost straight and forming right to slightly obtuse angle with its dorsal margin, of which ventral portion with small convexity by metapleural gland. Petiole relatively long in dorsal view, about 0.6× length of abdominal segment III.

Body color black.

Male

Yoshimura and Fisher (2014) - Measurements: HL 1.10–1.41, HW 1.43–1.85, SL 0.25–0.34, EL 0.59–0.76, WL 2.27–3.03, MnW 1.46–1.96, CI 127.9–132.0, SI 16.2–20.0, EI 49.9–54.1, MnI 101.4-107.6 (6 specimens measured).

Eye relatively small, occupying about half of head length. Ocelli relatively distant from dorsal margin of head in full-face view, or just failing to reach dorsal margin. Dorsal margin of head in full-face view rounded. Both anterior and lateral ocelli small. Distance between lateral ocellus and eye long, 3× longer than diameter of lateral ocellus. Posterior half of vertex clearly differentiated from dorsal half, dorsal face almost as long as posterior face. Palpal formula 4,3. First segment of maxillary palp flattened and distinctly wider than second segment. Second maxillary palpomere longer than third. Notauli clearly impressed on mesoscutum. Petiole in dorsal view thin, its length about 0.5-0.65× that of abdominal tergite III. Petiolar dorsum covered with rough, deep punctures. Abdominal tergum VIII roughly and deeply punctured.

Abdominal sternum IX punctured on its distal portion. Basal ring short, not extending basally. Telomere extending slightly further distally than digitus. Basoventral expansion of aedeagus less developed basoventrally, as long as dorsal extension. Ventral margin of aedeagus gently curved ventrally in lateral view. Aedeagus weakly narrowing distally, its distal portion widely rounded.

On forewing, cu-a located at junction of Media (M) and Cubitus (Cu).

Body color reddish brown to black.

Type Material

Yoshimura and Fisher (2014) - Lectotype [here designated]. Worker: CASENT0101670, MADAGASCAR, Amparafaravantsiv Moramangoufer [MHNG: examined].

References

  • Brown, W. L., Jr. 1960a. Contributions toward a reclassification of the Formicidae. III. Tribe Amblyoponini (Hymenoptera). Bull. Mus. Comp. Zool. 122: 143-230 (see also)
  • Forel, A. 1899c. Trois notices myrmécologiques. Ann. Soc. Entomol. Belg. 43: 303-310 (page 304, worker described)
  • Holldobler, B., Obermayer, M. & Alpert, G.D. 1998. Chemical trail communication in the amblyopone species Mystrium rogeri Forel (Hymenoptera, Formicidae, Ponerinae). Chemoecology. 8:119–123.
  • Menozzi, C. 1929e. Revisione delle formiche del genere Mystrium Roger. Zool. Anz. 82: 518-536 (page 527, queen, male described)
  • Molet, M., Peeters, C. & Fisher, B.L. 2007. Winged queens replaced by reproductives smaller than workers in Mystrium ants. Naturwissenschaften. 94:280-287.
  • Molet, M., B. L. Fisher, F. Ito, and C. Peeters. 2009. Shift from independent to dependent colony foundation and evolution of 'multi-purpose' ergatoid queens in Mystrium ants (subfamily Amblyoponinae). Biol. J. Linn. Soc. 98:198-207.
  • Yoshimura, M. & Fisher, B.L. 2014. A revision of the ant genus Mystrium in the Malagasy region with description of six new species and remarks on Amblyopone and Stigmatomma (Hymenoptera, Formicidae, Amblyoponinae). ZooKeys 394, 1–99.