Nesomyrmex mcgregori

Nesomyrmex mcgregori
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hymenoptera
Family:	Formicidae
Subfamily:	Myrmicinae
Tribe:	Crematogastrini
Genus:	Nesomyrmex
Species group:	simoni
Species:	N. mcgregori
Binomial name
	Nesomyrmex mcgregori; Mbanyana & Robertson, 2008

Four specimens were collected in Renosterveld vegetation on tillite soils. These were the only specimens captured from the extensive pitfall trapping, Winkler bag sampling and sweeping done in the Nieuwoudtville area of the Northern Cape, so it appears to be a rare species.

Identification

Mbanyana and Robertson (2008) - A member of the simoni species-group. Among the heavily sculptured species, N. mcgregori is similar looking to Nesomyrmex antoinetteae but is differentiated by the broader head (HW 0.836–0.934); the median portion of the dorsum of the head, which is smooth or reticulate and not covered by longitudinal rugulae; and the propodeum armed with acute spines. In N. antoinetteae head is narrower (HW 0.724–0.851); dorsum of the head is entirely covered by longitudinal rugulae; and the propodeum is armed with broad triangular teeth.

Keys including this Species

Distribution

Latitudinal Distribution Pattern

Latitudinal Range: -31.49972222° to -31.54305556°.


North Temperate	North Subtropical	Tropical	South Subtropical	South Temperate

Source: AntMaps

Distribution based on Regional Taxon Lists

Afrotropical Region: South Africa (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

Nomenclature

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

mcgregori. Nesomyrmex mcgregori Mbanyana & Robertson, 2008: 49, figs. 2j-l (w.) SOUTH AFRICA.

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

Description

Worker

Holotype. HL 1.106, HW 0.934, HW1 1.005, CI 84, SL 0.816, SI 87, PW 0.666, ML 1.343 EL 0.295, EI 32.

Mandibles with fine longitudinal striations. Clypeus smooth medially, bordered by two pairs of longitudinal striations. Median portion of the clypeus convex but almost flattened anteriorly. Eyes with 15 ommatidia in the longest row. Hind margin of head in dorsal view straight. Promesonotum in profile evenly convex and the metanotal groove conspicuously impressed. Propodeal dorsum convex. Propodeal spines short and broad, approximately same length as metapleural lobes. Metapleural lobes low and rounded. Anterior peduncle short and broad with rounded subpetiolar process that is roughly the length of the metapleural lobes. Petiolar node with anterior and posterior faces each angled at about 125 degrees with respect to the dorsum; dorsum sharply angled with respect to the anterior face but rounds evenly into the posterior face. Dorsum of postpetiole rounded in profile with anteroventral process. Dorsum of head with punctulate to finely reticulate ground-sculpture, which is overlaid by fine, longitudinal rugulae in places. Promesonotal dorsum with fine predominantly longitudinal rugulae, irregular in places. Propodeal dorsum and declivity with transverse rugulae, becoming irregular near metanotal groove. Petiolar dorsum with predominantly transverse rugulae, becoming reticulate-rugose in places. Postpetiolar dorsum reticulate-rugose. Base of first gastral tergite with costulae and rest of tergite with fine, superficial reticulate pattern. Head with four longitudinal lines of erect, acutely pointed hairs running between the eyes. The venter of head with only one curved hair and five straight hairs; sparse pubescence present. Promesonotum with four erect hairs; propodeal dorsum with six erect hairs; petiolar node with four suberect hairs and postpetiole with at least 10 suberect hairs. Sparse pubescence present. Regularly spaced suberect hairs on tergite and sternite of the gaster. Colour uniformly light brown.

Paratypes. HL 0.993–1.101, HW 0.836–0.915, HW1 0.915–0.981, CI 83–84, SL 0.733–0.806, SI 88, PW 0.577– 0.629, ML 1.175–1.292, EL 0.268–0.293, EI 32(2of3measured).

Same as holotype but the eyes with 14 ommatidia in the longest row instead of 15 ommatidia as is the case with the holotype. The venter of head with 5–6 straight hairs; pubescence present.

Type Material

Holotype: South Africa: Northern Cape: Glen Lyon farm, Sheep’s Leg Site (4.62 km 153° SSE Nieuwoudtville), 31°24.359’S 19°08.895’E, collected in natural Renosterveld on tillite, Pitfall,11–18 October 2000, H.G. Robertson, D. Larsen, R. Adams, NW00-TN2-P09, SAM-HYM-C019144. Paratypes: South Africa: Northern Cape: Glen Lyon farm, Sheep’s Leg Site (4.62 km 153° SSE Nieuwoudtville), 31°24.359’S 19°08.895’E, collected in natural Renosterveld on tillite, Pitfall,11–18 October 2000, H.G. Robertson, D. Larsen, R. Adams, NW00-TN2-P05, SAM-HYM-C019143; Glen Lyon farm, Sheep’s Leg Site (4.62 km 153° SSE Nieuwoudtville), 31°24.359’S 19°08.895’E, collected in natural Renosterveld on tillite, Yellow pan trap, 11–18 October 2000, H.G. Robertson, D. Larsen, R. Adams, NW00-TN2-Y20, SAM-HYM-C019141.

Etymology

Named after Neil McGregor who until recently owned the farm Glen Lyon, where the holotype was collected, and who has done so much to stimulate research, conservation and tourism in the Nieuwoudtville region.

References

References based on Global Ant Biodiversity Informatics

Hita Garcia F., Mbanyana N., Audisio T. L., and G. D. Alpert. 2017. Taxonomy of the ant genus Nesomyrmex Wheeler (Formicidae, Myrmicinae) in the Afrotropical region, with a review of current species groups and description of a new species of the N. angulatus group from Mozambique. European Journal of Taxonomy 258: 1–31.
Mbanyana N., and H. G. Robertson. 2008. Review of the ant genus Nesomyrmex (Hymenoptera: Formicidae: Myrmicinae) in southern Africa. African Natural History 4: 35-55.