Gnamptogenys ejuncida

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Gnamptogenys ejuncida
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ectatomminae
Tribe: Ectatommini
Genus: Gnamptogenys
Species: G. ejuncida
Binomial name
Gnamptogenys ejuncida
Lattke, 1995

Nothing is known about the biology of Gnamptogenys ejuncida.

Identification

A member of the porcata subgroup (in the striatula species group). On account of size, sculpture, pilosity and posteriorly inclined petiole node this species seems to be most closely related to Gnamptogenys pilosa, a very similar species found in an Andean canyon NW of Cali, Colombia. The sculpture of pilosa is much finer and its pilosity is a bit denser, including abundant erect hairs, practically lacking in ejuncida. The presence of erect to suberect hairs in pilosa vs. subdecumbent to decumbent hairs in ejuncida is especially notable on the femora. In lateral view the angle formed by the junction of the dorsal and declivitous propodeal faces is greater in ejuncida than in pilosa, giving it a more slender appearance. (Lattke 1995)

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Neotropical Region: Colombia (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Not much is known about the the biology of Gnamptogenys ejuncida. We can speculate that the biology of this species is similar to other species of the genus. Gnamptogenys are predatory ponerine ants that inhabit tropical and subtropical mesic forests. Nesting is typically at ground level in rotten wood or leaf litter. Some exceptions include species that are arboreal, a dry forest species and species that nests in sandy savannahs. Colony size tends to be, at most, in the hundreds. Queens are the reproductives in most species. Worker reproduction is known from a few species in Southeastern Asia. Generalist predation is the primary foraging/dietary strategy. Specialization on specific groups (millipedes, beetles, other ants) has developed in a few species.

Castes

Nomenclature

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

  • ejuncida. Gnamptogenys ejuncida Lattke, 1995: 165, figs. 48, 50 (w.) COLOMBIA.

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

Description

Worker

Holotype measurements: HL 1.10; ML 0.26; HW 0.88; SL 1.02; ED 0.18; WL 1.54 mm, CI 0.80; SI 1.56; OI 0.21.

With head in frontal view: vertexal margins slightly convex, lateral margins broadly convex and anterior clypeal margin convex; mandibles triangular and with rugose dorsum; anterior pronotal face with six transverse costulae, dorsum with longitudinal costulae; mesonotum with anteriorly convex costulae, transverse at metanotum and posteriorly convex on dorsal propodeal face; anepisternum with three transverse costulae that descend from mesonotum; rest of mesosomal side obliquely costulate, some curve around propodeal spiracies; declivitous propodeal face with longitudinal costulae; in lateral view dorsal mesosomal outline evenly convex, with no abrupt breaks or depressions; petiolar node posteriorly inclined: in lateral view transversely costulate with convex anterior margin, concave posterior margin and overhanging apex; subpetiolar process triangular and projecting anterad. Anterior face to dorsal two-thirds of postpetiolar dorsum with transverse costulae; rest of gastric sculpture longitudinal; postpetiolar sternum anteriorly transversely costulate, posteriorly divergent; transverse costulae on procoxae and anterior faces of meso- and metacoxae; metacoxal tooth well developed . Abundant suberect hairs and pubescence on body and extremities.

Type Material

Holotype worker. Colombia, Putumayo, Mocoa, 610 m, 4-1-77, C. Kugler, leg. Deposited in Instituto de Zoologia Agricola.

Etymology

This sleek species inspired the use of the Latin word for slender, ejuncida.

References