Gnamptogenys extra

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

Gnamptogenys extra P casent0179995.jpg

Gnamptogenys extra D casent0179995.jpg

Specimen Label

Nothing is known about the biology of Gnamptogenys extra.

Identification

A member of the porcata subgroup (in the striatula species group). This species has a fairly pointed petiolar node apex, but it doesn’t approach the extremely pointed condition of Gnamptogenys acuta. The node is more robust and subquadrate (lateral view) than in other porcata subgroup species and is reminiscent of the condition in G. tortuolosa. This species could be closely related to Gnamptogenys striatula on account of the node shape (erect) and the lacking anterior peduncle. (Lattke 1995)

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Neotropical Region: Colombia, Ecuador (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 extra. 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.

  • extra. Gnamptogenys extra Lattke, 1995: 167, figs. 45-47 (w.) ECUADOR.

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

Description

Worker

Holotype (Paratypes) measurements: HL 1.20 (1.10-1.12); HW 1.00 (0.94-l.00); ML 0.34 (0.30-0.34); ED 0.16 (0.14-0.18); SL 1.26 (l.00-1.20); WL l.68 (1.44-1.50) mm; CI 0.83 (0.85-0.98); SI 1.26 (1.06-1.20); IO 0.16 (0.15-0.19) n = 4.

With head in frontal view: vertexal margin straight, laterally convex with eyes slightly behind midlength, and anterior clypeal margin convex; mandibles triangular with dorsal striae; scapes relatively thick in appearance and surpassing vertexal margin; vertex with 2-3 transverse costulae; anterior pronotal face with 5-7 transverse costulae, dorsally with anteriorly arching costulae; costulae on mesonotal concentric or longitudinal; costulate on metanotum and dorsal propodeal face transverse to longitudinal, sometimes arched; declivitous propodeal face with longitudinal costulae that diverge posteriorly, basally with 2-3 transverse costulae.

Petiolar node in lateral view subquadrate, with broad anterodorsal convexity and sharp posterior drop with overhanging apex; subpetiolar apex is an anteriorly projecting lobe; anterior postpetiolar face with transverse costulae that arch back and become longitudinal posteriorly; rest of dorsal gastric costulae longitudinal, divergent on posterior postpetiolar sternum; ventral stridulitrum present on fourth abdominal segment. Scapes with abdundant decumbent pilosity and no suberect or subdecumbent hairs; decumbent pilosity also present on coxae and legs, with no standing hairs; sparse suberect hairs on rest of body. Body dark brown, legs and antennae slightly lighter.

Paratype Specimen Labels

Type Material

Holotype worker. Ecuador, Pichincha: Tinalandia, 16 km SE Santo Domingo de Los Colorados, VI-1976, S. & J. Peck, leg. Deposited in Instituto de Zoologia Agricola. Paratypes: (1) One worker with the same data as the holotype. Deposited in Museum of Comparative Zoology. (2) Two workers from Colombia, Choco: Lloro, Vereda Penaloza, 26-III-1988, V. Jaimes, leg. One worker in The Natural History Museum and Los Angeles County Museum of Natural History, respectively.

References