Gnamptogenys pilosa

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

Gnamptogenys pilosa P casent0900555.jpg

Gnamptogenys pilosa D casent0900555.jpg

Specimen Label

Nothing is known about the biology of Gnamptogenys pilosa.

Identification

A member of the porcata subgroup (in the striatula species group). This is the hairiest of all Gnamptogenys species. On account of size, slender habitus, posteriorly inclined petiolar node, fine costulation, and abundant pilosity its nearest relatives appear to be Gnamptogenys gracilis and Gnamptogenys ejuncida. The sculpture of ejuncida is coarser, the pilosity is not as dense and the presence of erect hairs is considerably less. The break between the dorsal and declivitous propodeal faces is sharper in G. pilosa, giving it a more robust aspect. G. gracilis is an endemic from the Guiana Shield area, and has the postpetiolar sternal disc smooth and shining. (Lattke 1995)

Key to New World Gnamptogenys 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 pilosa. 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.

  • pilosa. Gnamptogenys pilosa Lattke, 1995: 178, figs. 51-53 (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 (paratypes) measurements: HL 1.44 (1.40-1.48); HW 1.20 (1.20-1.22); ML 0.54 (0.46-0.54); ED 0.28 (0.28-0.30); SL 1.46 (1.50-1.57); WL 2.00 (2.00-2.06) mm; CI 0.83 (0.81-0.86); SI 1.21 (1.25-1.28); OI 0.23 (0.23-0.25) n =4.

With head in frontal view, vertexal margin fairly straight, sides broadly convex; anterior clypeal margin convex, lamella well developed; eyes prominent on posterior one half of head; mandibles triangular, apical margin denticulate, dorsum striate; cephalic dorsum with longitudinal parallel striae, diverging posterad at vertex; 1-2 transverse striae parallel to occipital carina; anterior prontal face transversely striate; dorsal mesosomal surface, including all of propodeum, longitudinally striate; striae curve around propodeal spiracles with no transverse striae between spiracles; lateral pronotal surface obliquely to transversely striate, striation on pleura and lateral propodeal face parallel with dorsal striae; inner procoxal faces punctate, anterolaterally transversely striae; lateral faces of meso- and metacoxae weakly striate; metacoxa with well-developed tooth.

Petiolar node transversely striate, low; viewed laterally with convex anterior margin and concave posterior margin, apex overhanging; subpetiolar process with a projecting anterior lobe and subquadrate posteriorly; transverse striae anteriorly on gastric tergum, up to three-fourths length of tergum, rest of gaster longitudinally striate; anteroventral postpetiolar process prominent; sternite with longitudinal striation, diverging caudad; abundant erect to suberect hairs on body and extremities; abundant pilosity on coxae, propodeum, petiole, antennae and legs.

Type Material

Holotype worker. Colombia, Valle: Calima, Canon El Pital, F. Castano, leg. Deposited in Instituto de Zoologia Agricola. Paratypes: Three workers with same locality data as holotype. One deposited in each of the following: Los Angeles County Museum of Natural History, The Natural History Museum, Museum of Comparative Zoology.

The late Mr. F. Castano kindly provided additional information about the type locality. The site is by a stream called Quebrada El Pital (tributary of Rio Calima) in a gorge 900-1300 m above sea level. Approximate coordinates: 3°08'N 76°40'W. The site will soon be flooded due to construction of a dam. The specimens were found on leaf litter in a cloud forest.

Etymology

The species name is derived from the Greek word for hair: pilos.

References