Stigmatomma crenatum

Stigmatomma crenatum
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hymenoptera
Family:	Formicidae
Subfamily:	Amblyoponinae
Tribe:	Amblyoponini
Genus:	Stigmatomma
Species:	S. crenatum
Binomial name
	Stigmatomma crenatum; (Xu, Z., 2001) Specimen labels

The type material was found in a semi-evergreen monsoon forest and from a fragment of mountain rain forest.

Identification

Xu (2001) - This new species is close to Stigmatomma rothneyi, but eye much smaller, with only 18 – 19 facets; body smaller with TL 6.7 - 7.3 mm; body in color black with appendages reddish brown. This new species is also close to Stigmatomma quadratum, but head distinctly longer than broad; eye smaller with ED 0.11 - 0.13 mm; body smaller with TL 6.7 - 7.3 mm; body in color black with appendages reddish brown.

Hamer et al. (2023), Fig. 12. Head comparison of Stigmatomma nr. quadratum group specimen collected in Hong Kong (A; ANTWEB1010961) to the holotypes of Stigmatomma quadratum (B; CASENT0916797, Flavia Esteves), S. reclinatum (C; CASENT0915649, Harald Bruckner), S. bellii (D; CASENT0102510, April Nobile), S. rothneyi (E; CASENT0102517, April Nobile) and S. crenatum (F; CASENT0104983, April Nobile). Stigmatomma feae holotype (CASENT0102126) not included here. Pictures available from www.antweb.org.
Hamer et al. (2023), Fig. 14. Genal tooth shapes, in full face view, across species within the Stigmatomma reclinatum group. Stigmatomma nr. quadratum (A; ANTWEB1010866), Stigmatomma quadratum (B; CASENT0916797, Flavia Esteves), S. reclinatum (C; ZRC_HYM_571.1), S. bellii (D; CASENT0102510, April Nobile), S. rothneyi (E; CASENT0102517, April Nobile) and S. crenatum (F; CASENT0104983, April Nobile). Stigmatomma feae holotype (CASENT0102126) not included here. Pictures available from www.antweb.org.

Keys including this Species

Distribution

Yunnan Province, China.

Distribution based on Regional Taxon Lists

Palaearctic Region: China (type locality).

Distribution based on AntMaps

Distribution based on AntWeb specimens

Check data from AntWeb

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.

Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.

Biology

Castes

Worker

Images from AntWeb


Paratype of Stigmatomma crenatum. Worker. Specimen code casent0104983. Photographer April Nobile, uploaded by California Academy of Sciences.	Owned by SWFC, Kunming China.

Nomenclature

The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

crenatum. Amblyopone crenata Xu, 2001d: 553, figs. 18-20 (w.) CHINA (Yunnan).
- Type-material: holotype worker, 3 paratype workers.
- Type-locality: holotype China: Yunnan Prov., Mengla County, Manzhuang Village, 900 m., 14.viii.1997, No. A97-1680, semi-evergreen monsoon forest of Xishuangbanna Nature Reserve (Y. He); paratypes Yunnan Prov., Mengla County, Menglun Town, Man’gang Village, 1000 m., 9.vii.1997, No. A97-3042, mountain rainforest fragment of Xishuangbanna Nature Reserve (G. Hu).
- Type-depository: SFCY.
- Combination in Stigmatomma: Yoshimura & Fisher, 2012a: 19.
- Status as species: Xu, 2006: 152 (in key); Zhou & Ran, 2010: 102; Guénard & Dunn, 2012: 23; Xu & Chu, 2012: 1182 (in key).
- Distribution: China.

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

Description

Worker

Holotype worker. TL 7.4, HL 1.53, HW 1.28, CI 84, SL 0.90, SI 71, PW 0.85, AL 2.00, ED 0.11, ML 1.18, DPW 0.78, DPL 0.78, PH 0.83. Head roughly trapezoid, longer than broad, weakly widened forward. Occipital margin weakly concave, occipital corners rounded, Lateral sides weakly convex, anterolateral corner of head with small genal tooth. Mandibles slender, relatively straight, with 2 rows of teeth, the dorsal row with 6 teeth, the ventral row with 5 ones. Anterior margin of clypeus weakly convex, with 12 minute denticles. Median furrow present on the anterior 2/3 dorsum of head. Antennae 12-segmented, apex of scape reached to 3/4 of the distance from antennal socket to occipital corner, segments 4-10 about as broad as long. Eyes relatively large, situated behind the midline of head, each with 19 facets. In profile view, pronotum weakly convex, both promesonotal suture and metanotal groove distinctly notched. Dorsum of propodeum evenly convex, longer than declivity, the latter truncate, posterodorsal corner of propodeum rounded. In profile view, petiolar node roughly trapezoid, narrowed backward, anterior face trpncate and straight, dorsum evenly convex, an terodorsal corner bluntly prominent and close to a right angle, ventral face oblique. Subpetiolar process nearly rectangular, without fenestra, rounded anteriorly, posteroventral corner toothed. In dorsal view, mesothorax strongly constricted, petiolar node nearly square, as broad as long, anterior and lateral borders weakly convex, posterior border straight. Constriction distinct between the 2 basal segments of gaster. Mandibles longitudinally and obliquely striate, with apex smooth. Clypeus longitudinally striate. Head with dense large punctures, dull. Thorax, petiole and first segment of gaster with dense mid-size punctures, less dull. Segments 2-5 of gaster with sparse fine punctures, relatively shining. The whole body surface and appendages with sparse suberect hairs and dense decumbent pubescence. Body in color black. Mandibles, clypeus, antennae, legs and apex of gaster reddish brown.

Paratype workers. TL 6.7-7.3, HL 1.43-1.53, HW 1.25-1.30, CI 85-88, SL 0.90, SI 69-72, PW 0.83-0.85, AL 1.88-2.00, ED 0.13, ML 1.00-1.10, DPW 0.75-0.80, DPL 0.73-0.78. PH 0.78-0.85 (3 individuals measured). As holotype but eye with 18-19 facets, gaster black or brownish black.

Type Material

Deposited in the Insect Collection, Southwest Forestry College, Kun-ming, Yunnan Province, China. Holotype worker, No. A97-1680, 900 m, Manzhuang Village, Mengla County, Yunnan Province, 14.Aug.1997, collected by Mr. HE Yun-Feng in semi-evergreen monsoon forest of Xishuangbanna Nature Reserve in southern Yunnan. Para types: 3 workers, No. A97-3042, 1000 m, Man' gang Village, Menglun Town, Mengla County, Yunnan Province, 9 July 1997, collected by Mr. HU Gang in a fragment of mountain rain forest of Xishuangbanna Nature Reserve.

References

Xu, Z. 2001b. Two new species of the ant genus Dolichoderus Lund from Yunnan, China. Acta Zootaxonomica Sinica. 26:355-360. (page 553, figs. 18-20 worker described)
Hamer, M.T., Pierce, M.P., Guénard, B. 2023. The Amblyoponinae (Formicidae) of Hong Kong. Asian Myrmecology 16, e016005 (doi:10.20362/am.016005).
Khachonpisitsak, S., Yamane, S., Sriwichai, P., Jaitrong, W. 2020. An updated checklist of the ants of Thailand (Hymenoptera, Formicidae). ZooKeys 998, 1–182 (doi:10.3897/zookeys.998.54902).
Liu, C., Fischer, G., Hita Garcia, F., Yamane, S., Liu, Q., Peng, Y.Q., Economo, E.P., Guénard, B., Pierce, N.E. 2020. Ants of the Hengduan Mountains: a new altitudinal survey and updated checklist for Yunnan Province highlight an understudied insect biodiversity hotspot. ZooKeys 978, 1–171 (doi:10.3897/zookeys.978.55767).
Yoshimura, M. & Fisher, B.L. 2012. A revision of male ants of the Malagasy Amblyoponinae (Hymenoptera: Formicidae) with resurrections of the genera Stigmatomma and Xymmer. PLoS ONE 7(3):e33325 (doi:10.1371/journal.pone.0033325).

References based on Global Ant Biodiversity Informatics

Fontanilla A. M., A. Nakamura, Z. Xu, M. Cao, R. L. Kitching, Y. Tang, and C. J. Burwell. 2019. Taxonomic and functional ant diversity along tropical, subtropical, and subalpine elevational transects in southwest China. Insects 10, 128; doi:10.3390/insects10050128
Guénard B., and R. R. Dunn. 2012. A checklist of the ants of China. Zootaxa 3558: 1-77.
Xu Z. H. 2001. A systematic study on the ant genus Amblyopone Erichson from China (Hymenoptera: Formicidae). Acta Zootaxonomica Sinica 26: 551-556.
Xu Z.-H., and J. J. Chu. 2012. Four New Species of the Amblyoponine Ant Genus Amblyopone (Hymenoptera: Formicidae) from Southwestern China with a Key to the Known Asian Species. Sociobiology 59(4): 1175-1196.
Xu Zheng-hui. 2001. A systematic study on the ant genus Amblyopone Erichson from China (Hymenoptera: Formicidae). Acta Zootaxonomica Sinica 26(4): 551-556.
Zryanin V. A. 2011. An eco-faunistic review of ants (Hymenoptera: Formicidae). In: Structure and functions of soil communities of a monsoon tropical forest (Cat Tien National Park, southern Vietnam) / A.V. Tiunov (Editor). – M.: KMK Scientific Press. 2011. 277 р.101-124.