Gnamptogenys aspera

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Gnamptogenys aspera
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ectatomminae
Tribe: Ectatommini
Genus: Gnamptogenys
Species: G. aspera
Binomial name
Gnamptogenys aspera
Morgan, Mackay & Pachero, 2003

Collected from a litter sample from a montane evergreen forest.

Identification

Morgan et al. (2003) - A member of the strigata complex. The workers are medium sized, ranging from 3.0 to 4.5 mm in total length. The coloring on this ant is very interesting in that the costulae are dark brown on the edges while inside the folds the coloring is a deep red, rendering a mahogany color to the head, mesosoma and gaster. The legs are reddish brown, strongly contrasting with the remainder of the ant. The subpetiolar process is well developed with a poorly developed fenestra. The metacoxa has a well-developed tooth. The distinguishing character is the fine punctures on the costulate over her entire body, giving it a sequined look.

The worker of this species can be separated from most of the others in the genus, by the punctate costulae on all parts of the body. It can be separated from other members of the strigata complex by several characteristics: It is easily separated from Gnamptogenys bisulca (Costa Rica to Ecuador) by the lack the metanotal suture. The presence of costulae over the entire surface of the sternum of the postpetiole separates it from Gnamptogenys pittieri (Venezuela) in which the sternum is covered with weak, irregular rugae. It differs from Gnamptogenys ilimani by the presence of about five to seven, erect, coarse hairs on the scape, which are lacking (up to two may be present) in G. ilimani. It can be separated from G. andina (Columbia, Ecuador) as the fenestra on the subpetiolar process is poorly developed (very well developed in G. andina), and the punctated costulae, which are glossy and shiny in G. andina. Finally, G. strigata lacks the fine punctures on the costulae, which are all smooth and glossy. This new species could perhaps be confused with Gnamptogenys kempfi (Brazil, Columbia Peru), which also has fine punctures on the costulae (making the surface appear subopaque). It can be easily separated as the propodeum lacks spines (small teeth or angles are present on the propodeum of G. kempfi), and the metacoxal tooth is slender and slightly curved (straight and thickened in G kempfi). The costulae on the dorsum of the propodeum are longitudinal, whereas they are transverse in G. kempfi.

Keys including this Species

Distribution

Known only from the type locality in Bolivia.

Distribution based on Regional Taxon Lists

Neotropical Region: Bolivia (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Nomenclature

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

  • aspera. Gnamptogenys aspera Morgan, Mackay & Pachero, 2003: 554, figs. 1-6 (w.) BOLIVIA.

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

Description

Worker

Holotype in parentheses: HL 0.86-(0.96)-1.08; ML 0.50-(0.58)-0.62; HW 0.82-(0.91)-0.96; SL 0.72-(0.84)-0.90; ED (0.14)-0.1; EW 0.10-(0.12); WL 1.08-(1.20)-1.27; SSC 5-8 standing hairs. Indices: CI (89)-95; SI 86-(92)-94; OI 16-(19)-20; MI 69-(64)-65.

Mandibles triangular, with apical tooth curving down and inward toward head, mandibular margins meeting just in middle (no overlap); mandibles serrated with tiny teeth along masticatory, margin, apical being largerr than other teeth; clypeal margin rounded convexly with medial section protruding (Fig. 5), forming almost 90° angle at medial point; scape extends one diameter past posterior lateral margin of head; head oval- shaped; eyes medium sized, oval-shaped; promesonotal suture developed (Fig. 1), metanotal suture weakly apparent; petiole semicircular, posterior face flattened when viewed from above; subpetiolar process well developed; fenestra opaque; subpeduncular pro y-shaped when viewed from below (Fig. 2).

Integuement with longitudinal costulate on head, mesosoma, postpetiole and gaster; costulae in concentric circles on petiole when viewed from above (Fig. 4); surfaces of costulae covered with tiny punctures rendering a sequined look (Fig. 6).

Three to four long erect hairs along anterior margin of clypeus; scape with 5 to 8 erect hairs along dorsal surface, head with many long, erect hair in longitudinal rows curving toward frontal furrow; long erect hairs in longitudinal rows that continue on mesosoma, postpetiole, and gaster; petiole with erect hairs in concentric, circular rows as viewed from above.

The color is striking, depressions between costulae reddish-brown, surfaces dark brown, giving ant mahogany color; appendages medium brown distinctly contrasting with remainder of body.

Type Material

Holotype worker (deposited in the MCZ), Bolivia, Cochabamba, 109 km E Cochabamba at Lagunitas; 6 paratype workers, deposited in the collection of William and Emma Mackay, California Academy of Sciences, Instituto Humboldt (colobia), Instuto de Zoologia Agricola (Venezuela), and Museu de Zoologia da Universidade de Sao Paulo (Brazil).

Etymology

Latin from asperses meaning scattered or sprinkled, referring to the sculpture on the costulae.

References

  • Morgan, C.; Mackay, W.; Pacheco, J. 2003. A new Gnamptogenys of the striatula Group from Bolivia (Hymenoptera: Formicidae). Sociobiology 4(3):553-558. (page 554, figs. 1-6; map ; worker described)