Rhytidoponera depilis

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This rainforest species is found along the coast foraging on low vegetation. The nests are distinctive in the form of a clay turret constructed around the base of a sapling.

Rhytidoponera depilis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ectatomminae
Tribe: Ectatommini
Genus: Rhytidoponera
Species: R. depilis
Binomial name
Rhytidoponera depilis
Ward, 1984

Rhytidoponera-depilis-Paratype-MCZ001L.jpg

Rhytidoponera-depilis-Paratype-MCZ001D.jpg

Paratype Specimen Label

Identification

This is a large, black pulchella-group species which can be immediately recognized by the lack of erect hairs on most parts of the body and by the densely pubescent gastric tergites.

Distribution

Distribution based on Regional Taxon Lists

Australasian Region: New Caledonia (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

R. depilis is known only from coastal rainforest (10 m elevation). Workers were observed foraging on low vegetation. Two colonies were collected: both were located in soil next to a small sapling, and had a distinctive nest entrance in the form of a clay turret constructed around the base of the sapling.

Castes

Nomenclature

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

  • depilis. Rhytidoponera depilis Ward, 1984: 157, figs. 39, 40, 45, 46 (w.) NEW CALEDONIA.

Type Material

Description

Holotype worker. New Caledonia: Fausse Yate Riviere 10 m, 26. iv. 1980, foraging on low vegetation, rainforest (P.S. Ward acc. No. 4106) (ANIC Type No. 7581).

Paratype workers: (1)A series of 2 accessions from Fausse Yate Riviere (P.S. Ward acc. Nos 4104, 4106) (ANIC, PSW). (2)A series of 2 accessions from 6 km SE Touaourou, 10m, 27. iv. 1980, workers foraging on low vegetation and nesting in soil at base of sapling, rainforest (P.S. Ward acc. Nos 4130-1, 4131) (BMNH, MCZ, MNHN, PSW). (3) 2 workers, Touaourou, 20.x.1958 (B. Malkin) (BPBM).

Non-paratypic material: 1 worker, Oubatche (Sarasin and Roux)(MHN). I suspect that this worker, which Forel presumably received from Emery, has been mislabelled. Oubatche is north-west of Hienghene, at the opposite end of the island to the type locality. It is possible that this specimen is the 'puchella' worker which Emery (1914, p. 396) referred to, and briefly described, from Yate.

Measurements <br.

Holotype worker. HW 1.24, WL 1.91, CI 0.91, MI 0.36, SI 1.05, SL12 0.19, SSC 0, FSC 0.

Paratype workers. HW 1.18-1.24, WL 1.78-1.85, CI 0.89-0.92, MI 0.35-0.40, SI 1.01-1.05, SL13 0.17-0.20, SSC 0, FSC 0 (n=9).

Diagnosis of Worker

Similar to arbores (Q.V.) in relative body dimensions, sculpture, and colour. Eyes a little larger (OI 0.27-).30). Occipital lobes broadly rounded and not protruding in lateral view. Pronotum averaging a little more slender than in arborea (PI 0.74-0.78). Petiolar node relatively narrow in dorsal view (PN12 0.42-0.450. Subpetiolar proess with a rather broad tooth (SPI 0.21-0.31). Rugose sculpture on head becoming longitudinally rugostriate on vertex, near the posterior margin. Inter-rugal punctures on pronotum becoming isolated on the sides, surrounded by irregular striate sculpture. Sculpture on petiolar node and abdominal tergite III finder than in arborea (rugulose on node; finely rugostriate to striate on abdominal tergite III). Erect pilosity sparse or absent on most of the upper body surface, lacking entirely on the legs and scapes; gastric tergites covered by a dense mat of appressed pubescence, which is multibranched on abdominal tergit IV.

References

Ward, P. S. 1984. A revision of the ant genus Rhytidoponera (Hymenoptera: Formicidae) in New Caledonia. Aust. J. Zool. 32: 131-175(page 157, figs. 39, 40, 45, 46 worker described)