Rhytidoponera wilsoni

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This species forages during the daylight hours on foliage and over rocks on the forest floor.

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

Rhytidoponera-wilsoni-Holotype-MCZ29863L.jpg

Rhytidoponera-wilsoni-Holotype-MCZ29863D.jpg

Holotype Specimen Label


Identification

Holotype [MCZ] a stray diurnal forager taken on foliage at 180-400 m. on Mt. Mou, north of Paita, New Caledonia (E.O. Wilson leg., XII-10-1954, No. 110). Paratype workers were taken with the holotype and at Le Chapeau Gendarme, east of Yahoue, and at Ciu, near Mt. Canala (Wilson Nos. 73, 74, 80, 96 and without numbers). These were taken foraging during the daylight hours on foliage and over rocks on the forest floor. One nest was found beneath a stone; other workers came from leaf litter berlesates. The Ciu sample was very dark, and had the legs dark brown. The occipital border varied in degree of concavity. Paratypes in MCZ, USNM and elsewhere.

Distribution

Distribution based on Regional Taxon Lists

Australasian Region: New Caledonia (type locality).

Specimens have been collected by G.B. Monteith from dung traps (#11094) at Yahoue, 90 meters elevation, 3-4 November 2002, 22°12′0″S 166°30′0″E / 22.2°S 166.5°E / -22.2; 166.5 .

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

These were taken foraging during the daylight hours on foliage and over rocks on the forest floor. One nest was found beneath a stone; other workers came from leaf litter berlesates.

Castes

Nomenclature

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

  • wilsoni. Rhytidoponera wilsoni Brown, 1958g: 294, fig. 38 (w.) NEW CALEDONIA. See also: Ward, 1984: 150.

Type Material

Description

Holotype worker: TL 5.2, HL 1.25, HW (excluding eyes) 1.06 (CI 87) WL 1.73, scape L 1.12, max. diameter eye 0.26 mm. Very similar to Rhytidoponera numeensis, from which it differs principally in have a notably more strongly anteroposteriorly compressed node, with a different petiolar process; the posterior face of the node is concave as seen from the side. The head of wilsoni has a more broadly concave occipital margin (straighter in some views) and slightly more sharply rounded occipital corners than in numeensis. The sculpture differs in several details; generally speaking, the punctures are coarser and more closely contiguous over head, alitrunk and gaster, and the ridges between tend to form coarse, rather indefinite rugules (longitudinal on head, diagonal on sides of alitrunk, transverse on propodeum and anterior face of petiolar node) in place of the fine, dense striation of these same areas in numeensis. Postpetiole rather finely arched-striate, passing into a posteromedian area of finer, concentric striae that are interrupted by and interspersed with fine, indistinct punctulation. Coarse piligerous punctures of this segment very shallow, indistinct, and not so clearly elongate as the corresponding ones in numeensis. Second gastric segment very finely and densely striate, the pattern arched over a posteromedian weakly shining area of very superficial elliptical-concentric striation (longitudinal axis) that is very finely interrupted or coriaceous (clearcut, uniform, and predominantly longitudinal striation in numeensis). Coarse piligerous punctures of this segment small and inconspicuous, much smaller than the corresponding ones of numeensis.

Erect pilosity and appressed pubescence fairly abundant but not dense, uneven in length, the pubescence conspicuous at all only on the gaster and appendages. Color piceous, the head, petiole and gaster ligher and a bit more reddish than the alitrunk. To the naked eye, the body appears very dark, nearly or quite black. Legs, mandibles and antennae orange-brown. Coloration in general much like that of numeensis.

References