Gnamptogenys laticephala

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

Nothing is known about the biology of Gnamptogenys laticephala.

Identification

A member of the banksi complex (in the banksi subgroup of the rastrata species group). The two lobes between the antennal fossae and clypeal lamella distinguish this species from all other New World members of the group, which lack such lobes, including its closest relative, Gnamptogenys banksi. Other characters in which banksi differs are the following: areolate sculpture on the cephalic dorsum, occiput and anterior pronotal face with transverse rugae, deep lateral and mesonotal pits for the spiracles (such pits lacking in fraudatrix), pronotal suture interrupts sculpture, and the inner mandibular sulcus only reaches the basal angle. In general the sculpture of banksi is rougher, mostly of gaster I, which is reticuate rugose and gaster II has rough, widely spaced, dorsal longitudinal rugae, becoming more irregular laterally. The form of the pronotal-mesopleural suture and the lobes formed by the pronotum and anepisternum at the base of the suture are reminiscent of some minuta group species. (Lattke 1995)

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Neotropical Region: 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 laticephala. 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.

  • laticephala. Gnamptogenys laticephala Lattke, 1995: 172, figs. 54, 55 (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 measurements: HL l.71; ML 1.01; HW 1.94; SL 1.53; ED 0.34; WL 2.32 mm; CI 1.13; SI 0.79; OI 0.18.

Head in frontal view broad, vertexal margin fairly straight, lateral margins slightly convex and anteriorly diverging; eyes large and situated at cephalic midlength; anterior clypeal lamella broadly concave with lateral triangular teeth near mandibular insertions; clypeus with two small anteriorly projecting lobes between anterior border of antennal fossae and anterior lamella; cephalic dorsum with longitudinal rugae that di verge slightly posterad on to vertex; rugae between frontal lobes and eyes more irregular than rugae between and behind frontal lobes; abundant piligerous punctures present. Antennal scapes smooth and shining, surpassing vertexal margin; gula with median longitudinal carinae and transverse costae at each side; mandibles falcate, longitudinally costulate with interior glabrous sulcus that ends at apical tooth, basal tooth marks the end of basal margin and is followed by two more pre-apical teeth; anterior pronotal face opaque, not as shiny as rest of pronotum and with faint transverse rugulae; mesosomal dorsum with parallel longitudinal costulae, promesonotal suture well impressed but does not break longitudinal sculpture, mesometanotal suture deep and interrupting sculpture except for some ridges that join a few costulae on either side of suture; lateral pronotal face with slightly oblique parallel costulae; pronotal-mesopleural suture very broad and deep; meso- and metepisterna with parallel, longitudinal costulae; mesometepisternal suture well impressed and metepisternal-propodeal suture distinct; metepisternal lobe well developed; declivitous propodeal face with longitudinal costulae; petiolar node in lateral view low, anterodorsal margin convex and posterodorsal margin sharply convex; transversely costulate; subpetiolar process anteriorly triangular, with slighty rounded posterior lobe.

Postpetiolar costulation longitudinal, weakly roughened and becoming rugulose laterally, ventrally with transverse costulate that tend to fade medially; gastric tergum II strongly vaulted anteroventrally with dorsal and lateral sculpture as on preceding segment; apical gastric segments with faint transverse strigulae, tending to smooth and shining; anterior face of procoxae smooth and shining laterally with oblique costulae; meso- and metacoxae laterally smooth and shining, dorsally transversely costulate; metacoxal teeth well developed; body with sparse suberect and decumbent hairs, longest on gastric apex and clypeus, no appressed pilosity on scapes, just suberect and decumbent hairs. Mesosoma dark reddish brown; head, node and gaster darker; legs and antennae brown; mandibles brown to yellow brown.

Type Material

Holotype worker. Ecuador, Guayas: 3 km 5 Bucay, 24-VII-73, W. L. Brown, leg. Deposited in Museum of Comparative Zoology.

Etymology

The name alludes to the relatively broad head when seen in frontal view.

References