Gnamptogenys grammodes

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Gnamptogenys grammodes
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ectatomminae
Tribe: Ectatommini
Genus: Gnamptogenys
Species: G. grammodes
Binomial name
Gnamptogenys grammodes
Brown, 1958

Gnamptogenys grammodes casent0900561 p 1 high.jpg

Gnamptogenys grammodes casent0900561 d 1 high.jpg

Specimen Labels

A denizen of New Guinea rainforests. Some collections of this species have been made from rotten logs.

Identification

Modified from Lattke (2004) - Keys out close to Gnamptogenys biroi. Gnamptogenys grammodes may be closely related to biroi based on similarities in the occipital lamella and the shape of the subpetiolar process. The postpetiolar dorsum of G. grammodes differs from that of G. biroi in having a posterior strip of longitudinal carinulae and smoother cuticle anterad with punctae and no foveolae as in G. biroi. G. grammodes has a mostly smooth fourth abdominal tergite and is a smaller ant (HL > 1.2 mm;WL > 1.60 mm) than G. biroi.

Distribution

Based on current collection records this ant is endemic to New Guinea.

Distribution based on Regional Taxon Lists

Indo-Australian Region: Indonesia, New Guinea (type locality).

Distribution based on specimens

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The above specimen data are provided by AntWeb. Please see Gnamptogenys grammodes for further details

Biology

Not much is known about the the biology of Gnamptogenys grammodes. 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.

  • grammodes. Gnamptogenys grammodes Brown, 1958g: 310, fig. 41 (w.) NEW GUINEA. Lattke, 2004: 118 (q.m.).

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

Lattke (2004) - Head with convex lateral margins that curve gradually onto straight to slightly convex posterior margin in frontal view; occipital lobe lacking, occipital lamella forming blunt, triangular lobe. Postpetiolar dorsum with scattered foveolae over mostly smooth background sculpturing, posterior one-third up to one-half with longitudinal parallel carinulae.

Description

Worker

Lattke 2004 Gnamptogenys fig 25-27

Lattke (2004) - Metrics (n = 5): HL 1.04-1.14, HW 0.90-0.96, ML 0.53-0.58, SL 0.91-1.02, ED 0.23-0.29, WL 1.41-1.53 mm. CI 0.83-0.87, SI 1.01-1.06, MI 0.55-0.62, OI 0.24-0.31. Head with convex lateral margins curving gradually onto straight to slightly convex posterior margin in frontal view, anterior margin of clypeal lamella with median convex lobe; frons longitudinally strigulose-foveolate; vertex mostly smooth; clypeus longitudinally strigulose. Scape mostly smooth with longitudinal strigulae; occipital lobe lacking, occipital lamella forming blunt, triangular lobe. Pronotum foveolate with smooth posteromedian area; mesometanotum longitudinally rugose-foveolate; katepisternum mostly rugulose-foveolate; metapleuron anterodorsally mostly smooth, posteroventrally longitudinally strigulose; propodeum foveolate with scattered longitudinal to oblique undulations and rugulae, propodeal dorsum foveolate with low transverse undulations and strigulae, propodeal dorsum curves gradually onto mostly smooth declivity.

Petiolar node with anterior margin forming gradual convexity in lateral view, higher posterad than anterad; dorsum mostly smooth with scattered lateral foveolae; ventral process projecting anterad as small, acute triangular lobe; postpetiole mostly smooth laterally with scattered foveolae, each foveola abruptly impressed anterad and gradually sloping posterad, posterior margin with longitudinal strigulae; pospetiolar dorsum with scattered foveolae over background sculpturing ranging from mostly smooth to transversely strigulose, posterior one-third up to one-half with longitudinal parallel carinulae; dorsum of abdominal segment 4 mostly smooth with scattered punctulae, posterolaterally with narrow band of longitudinal striae, sternum rugulose. Fore coxa transversely strigulose in lateral view; fore tarsus opposite strigil with single stout seta followed apically by row of slender setae; metacoxal tooth triangular and slender. Dorsum of thorax and abdominal segments 1-4 with scattered erect to subdecumbent hairs. Head, mesosoma, petiole, and gaster dark brown; mandibles, antennae, legs ferruginous brown.

Queen

Lattke (2004) - Metrics (n = 1): HL 1.25, HW 1.06, ML 0.65, SL 1.03, ED 0.36, WL 1.79 mm. CI 0.85, SI 0.97, MI 0.61, OI 0.34. Pronotum foveolate in lateral view, foveolae irregularly distributed among smooth areas; mesonotum with scattered foveolae and low longitudinal strigulae; mesoscutum longitudinally strigulose-punctulate; lateral propodeal face transversely rugulose-punctate; petiolar node with smooth median area and transverse strigulae on anterior and posterior margins in dorsal view. Postpetiole with transverse strigulae along anterior one-third, longitudinally strigulose along posterior two-thirds.

Male

Lattke (2004) - Metrics (n = 1): HL 0.84, HW 0.77, ML 0.43, SL 0.28, ED 0.31, WL 1.48 mm. CI 0.92, SI 0.36, MI 0.56, OI 0.40. Frons irregularly areolate on low rugulae; median longitudinal ridge extends from posterior clypeal margin to between antennal insertions on elevated area; frontal triangle relatively wide and flat bottomed; clypeus strigulose; mandible longitudinally strigulose. Pronotum, mesopleuron mostly smooth with scattered shallow foveolae in lateral view; metapleuron, lateral propodeal face rugulose; mesonotum with large smooth areas and irregularly scattered shallow foveolae; scutellum strigulose. Fourth abdominal tergite with low, fine longitudinal undulations, slightly colliculate; fourth abdominal sternite strigulose.

Type Material

Lattke (2004) - Holotype worker: Papua New Guinea, Bisianumu, near Sogeri (Wilson) (Museum of Comparative Zoology) [Examined].

References