Rogeria lacertosa

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Rogeria lacertosa
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Solenopsidini
Genus: Rogeria
Species: R. lacertosa
Binomial name
Rogeria lacertosa
Kempf, 1963

Nothing is know about the biology of this species.

Identification

Kugler (1994) - germaini species group. WL 0.93-1.05mm. Clypeal apron with median notch. Metanotal groove weak to strong. Petiolar keel with single lamellate carina. Sting shaft apex has dorsal flange; lancets acute; both weak. Macrosculpture not effaced on side of head below eye. Promesonotal rugae sharp and narrow like those on head. Sides of both nodes distinctly macroareolate. Erect hairs on scapes. No decumbent hair on gaster; little if any on mesosoma dorsum.

Similar to Rogeria germaini but differs in size (lacertosa larger), clypeal shape, sculpture on side of head, and pilosity. Rogeria pellecta, also from southern Brazil, differs in petiole keel, sting and lancets, promesonotal sculpture, and pilosity.

Keys including this Species

Distribution

Only from the type material collected from 100-200m elevation in southern Brazil.

Distribution based on Regional Taxon Lists

Neotropical Region: Brazil (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

The following is modified from Kugler (1994): Little is known about these cryptic ants. Collection records typically range from sea level to 1000m, but five species extend higher and two (Rogeria unguispina and Rogeria merenbergiana) can be found at 2000m. Rogeria are generally collected in moist forests (primary or secondary forests, coffee or cacao plantations), but at higher elevations can be found in pastures (Rogeria leptonana, Rogeria merenbergiana). Several species (Rogeria creightoni, Rogeria cuneola, Rogeria foreli) have been found in moist and dry climates. Rogeria foreli is the most unusual, with some members dwelling at over 1800m in the temperate mountains of southern Arizona.

Most species have only been collected as strays or by Berlese or Winkler sampling, from leaf litter and rotten wood, but occasionally among epiphytes and moss (Rogeria belti, creightoni, Rogeria exsulans). Nests of several species (belti, Rogeria blanda, merenbergiana) have been found under the loose bark of rotten logs. Nests of blanda and Rogeria tonduzi have been taken from the trunks of cacao trees. A nest of Rogeria leptonana was found at 1750m under a rock in a pasture.

Nests are rarely found. Males are known for only four species (belti, blanda, leptonana and Rogeria stigmatica) and queens associated through nest series for only nine species.

Castes

Only known from workers.

Nomenclature

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

  • lacertosa. Rogeria lacertosa Kempf, 1963a: 194, fig. 5, 6 (w.) BRAZIL. See also: Kugler, C. 1994: 44.

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

Description

Worker

(holotype) - Total length 3.9 mm; head length 0.81 mm; head width 0.77 mm; maximum distance between outer edges of frontal carinae 0.29 mm; eye length 0.10 mm; scape length 0.61 mm; thorax length 1.01 mm; pronotum width 0.56 mm; petiole length 0.51 mm; petiole width 0.24 mm; postpetiole length 0.27 mm; postpetiole width 0.29 mm. Ferruginous; gaster dark brown.

Head. Mandibles smooth and shining with the usual 6 teeth on chewing border. Median lobe of clypeus truncate in front, laterally carinulate. Frontal area impressed. Frontal carinae broadly expanded, distance between their outer edges exceeding 1/3 of maximum head width. Scape finely and rather vestigially punctate, quite shining. Funicular segments IX and X not distinctly longer than broad. Compound eyes with about 20 facets. Front and cheeks with widely spaced, strong, posteriorly slightly diverging, longitudinal rugae; sculpture becoming coarsely reticulate-rugose on vertex, occiput and sides of head; on top of the vertex, the transverse, arched rugae predomina te as is usual for the species of the genus. Interrugal spaces finely and rather superficially reticulate-punctate, not quite shining.

Thorax. Scapular angle indistinct. Promesonotal disc longitudinally vermiculate-rugose, with occasional cross-connections among rugae. Mesoepinotal groove scarcely impressed. Basal face of epinotum somewhat longer than broad, with 7 transverse carinules, the first more prominent, the 2nd to 5th somewhat irregular, not all of them complete. Epinotal spines widely separated from each other at base, scarcely diverging and gently raised towards apex, not longer than their distance at base. Interrugal spaces on thorax sculptured as those on head; rather obsolete microsculputure on sides of thorax, which are predominantly horizontally rugose and quite shining. Metasternal lobes with superior and inferior corners angulate to subdentate. Declivous face of epinotum smooth and shining. So are also the legs.

Petiolar peduncle shagreened and opaque above, smooth and shining below with a prominent, thin, sagittal crest; slightly shorter than the elongate, coarsely reticulate-rugose, feebly compressed, anteriorly abruptly raised, node which forms in front a rounded peak. Postpetiole a bit broader than long, finely reticulate-punctate, and more coarsely longitudinally rugose, rugae stronger on sides than on disc. Sides of postpetiole strongly converging towards petiolar insertion, in dorsal view very gently constricted also in front of gastric origin. Gaster smooth and shining.

Erect, fine and long hairs abundant and very dense on body, oblique on scapes and legs (very prominent). Gaster lacking decumbent hairs between the erect ones.

The measurements of the 8 paratypes vary as follows: head length 0.83-0.91 mm; head width 0.72-0.80 mm; thorax length 0.93-1.04 mm The compound eyes are variable in size and number of facets according to body length: larger specimens have about 20, smaller specimens only 15 facets. Upper angle of metasternal lobe quite variable. Transverse carinules on basal face of epinotum 6-7 in number when distinguishable; sometimes highly irregular and difficult to make out as regards carinules 2-5.

Kugler 1994 fig 24-31

Kugler (1994) - TL 3.6-4.0, HL 0.83-0.91, HW 0.72-0.81, SL 0.59-0.61, EL 0.10-0.11 (19-20 facets), PW 0.52-0.60, WL 0.93-1 .05, SpL 0.17-0.20, PetL 0.43-0.45, PpetL 0.23-0.26mm, CI 0.87-0.88, OI 0.13-0.14, SI 0.75-0.79, PSI 0. 18-0.20. N=4

The following supplements Kempf (1963). All specimens at hand with 6 mandibular teeth decreasing in size basad, except for a large basal tooth. Eyes elliptical. Nuchal groove forms a notch in lateral view of head. Anterior edge of propodeum not marked by a transverse carina. Metapleural lobes low and broadly rounded or triangular with more narrowly rounded apex. Postpetiolar node from above like that of pellecta. Sting apparatus as inermis, but sting shaft and lancets are less sclerotized (easily twisted) and the lancets lack the barbule.

Laterodorsa of head predominantly rugose to rugose-areolate. Back of head areolate in a transversely arched pattern. Microsculpture vestigial; intervals with a shiny, effaced granular appearance. Anterior face of pronotum transversely areolate; disc with diverging, longitudinal, vermiculate rugae with variable number of cross-ridges imparting a rugose-areolate appearance in places. Sides of mesosoma predominantly longitudinally rugose, but with occasional cross-ridges making elongate cells. Intervals in mesosoma macrosculpture shiny, nearly smooth, especially on sides. Anterior and sometimes dorsal faces of nodes weakly sculptured. Nodes slightly dulled by vestigial microsculpture.

Head dorsum with erect-suberect hairs in addition to the typical decumbent pilosity.

Color yellowish-brown; gaster slightly darker. Legs and, sometimes, antennae lighter, more yellowish. Mandibles often slightly darker than head capsule.

Type Material

Kugler (1994) - Holotype and paratype workers, BRAZIL: Rio Grande do Sui State, Sinimbu (F. Plaumann) Museu de Zoologia da Universidade de Sao Paulo [All 4 paratypes examined; holotype not examined].

References

  • Kempf, W. W. 1963a. Additions to the Neotropical ant genus Rogeria Emery, with a key to the hitherto recorded South American species (Hym., Formicidae). Rev. Bras. Biol. 23: 189-196 (page 194, fig. 5, 6 worker described)
  • Kugler, C. 1994. A revision of the ant genus Rogeria with description of the sting apparatus (Hymenoptera: Formicidae). J. Hym. Res. 3: 17-89 (page 44, see also)[[category:Need Images]