Polyrhachis gamaii

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Polyrhachis gamaii
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Camponotini
Genus: Polyrhachis
Subgenus: Myrma
Species group: gammaii
Species: P. gamaii
Binomial name
Polyrhachis gamaii
Santschi, 1917

Polyrhachis gamaii casent0906822 p 1 high.jpg

Polyrhachis gamaii casent0906822 d 1 high.jpg

Specimen Labels

Nothing is known of the biology of this species, but a lone female without wings was found in South Africa in March (Bolton 1973)

Identification

Polyrhachis gamaii species-group

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Afrotropical Region: South Africa (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Nomenclature

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

  • gamaii. Polyrhachis (Myrma) gamaii Santschi, 1917b: 295 (q.) SOUTH AFRICA. Arnold, 1947: 136 (w.). See also: Bolton, 1973b: 351.

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

Description

Worker

Bolton (1973) - TL 7.7-8.5, HL 1.81-1.97, HW 1.70-2.08, CI 94-105, SL 1.81-2.08, SI 100-106, PW 1.18-1.48, MTL 2.37-2.59. (6 measured.)

Head truncated in front so that the clypeus is almost vertical, its anterior margin entire. Sides of head convex, the convex eyes situated well up from the ventrolateral margin, not breaking the outline of the sides of the head in full-face view. Pronotum and mesonotum not marginate, the dorsal surfaces rounding into the sides; propodeum marginate laterally. Humeral angles of the pronotum without spines but projecting as bluntly rounded tubercles. Propodeum with a pair of thick, tuberculiform teeth, directed upwards and weakly outwards. Promesonotal suture distinct; the mesoscutellum present on the dorsum, separated from the scutum in front and the propodeum behind by a pair of weakly raised, transverse carinae, best seen in profile. Petiole armed with a dorsal pair of long straight spines whose apices curve slightly inwards in front view, and with a laterally placed pair of acute teeth. The subpetiolar process is developed anteriorly into a dentiform lobe.

Erect hairs present only on the mandibles, clypeus and the apex of the gaster. A fine, sparse pubescence is present on the antennal scapes, the legs, and the first gastral segment in some individuals.

Sculpturation of head varying above the eyes from finely reticulate-punctate to superficially reticulate. The alitrunk dorsally finely reticulate to reticulate-punctate; the sides and the petiole more coarsely so. Declivity of propodeum and gaster very faintly and finely, superficially reticulate. Colouration a variable mixture of black, black-brown, red, and red-brown. Head black with red-brown mandibles, the antennal scapes red-brown or black. Alitrunk varying from red-brown with large infuscated areas to mostly black with weak red-brown or black-brown patches. The sides of the alitrunk usually red-brown but variously infuscated. Petiole and gaster varying from red-brown to black-brown; legs usually red-brown. In general the larger individuals tend to have more black and less red on the alitrunk than do the smaller forms.

Queen

Bolton (1973) - In general body form and sculpturation the differences between the female and the workers are only as expected between the two castes, but the female is distinctly more pilose and has the petiolar spines disproportionally spaced in comparison to the worker. Marked similarities include the head shape, development of pronotal tubercles and propodeal teeth, form of petiole, and the presence of a dentiform subpetiolar process.

Type Material

Bolton (1973) - Holotype queen, SOUTH AFRICA : Natal, Durban (H. B. Marley) (probably in NM, Basle).

References