Polyrhachis undulata

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Polyrhachis undulata
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Camponotini
Genus: Polyrhachis
Subgenus: Cyrtomyrma
Species: P. undulata
Binomial name
Polyrhachis undulata
Kohout, 2006

Polyrhachis undulata casent0903401 p 1 high.jpg

Polyrhachis undulata casent0903401 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of Polyrhachis undulata.

Identification

Similar to Polyrhachis emeryana and Polyrhachis pacifica. These other two species have a similar highly convex pronotum with the mesonotum and propodeum descending posteriorly in an uneven, stepped outline. Polyrhachis undulata shares the unevenly descending mesosomal profile but differs from Polyrhachis pacifica by a complete lack of propodeal spines and from Polyrhachis emeryana by distinctly angular pronotal humeri. Polyrhachis undulata also differs from both by its larger size (HL 1.53-1.59 in Polyrhachis undulata versus 1.28-1.34 in Polyrhachis pacifica and 1.34-1.40 in Polyrhachis emeryana) and in having the mesonotal dorsum distinctly higher than the pronotum. In Polyrhachis pacifica and Polyrhachis emeryana the summit of the pronotal dorsum is the highest point of mesosoma. (Kohout 2006)

Keys including this Species

Distribution

Solomon Islands

Distribution based on Regional Taxon Lists

Indo-Australian Region: Solomon Islands (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Known only from workers.

Nomenclature

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

  • undulata. Polyrhachis undulata Kohout, 2006b: 142, figs. 12G-H (w.) SOLOMON IS.

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

Description

Worker

Dimensions (holotype cited first): TL c. 6.30, 6.00-6.35; HL 1.59, 1.53-1.59; HW 1.50, 1.43-1.50; CI 94, 92-94; SL 1.72, 1.59-1.72; SI 115, 111-117; PW 1.25, 1.12-1.25; MTL 2.09, 2.00-2.09 (3 measured).

Clypeus in profile very weakly, evenly convex with weakly and narrowly impressed basal margin, indicated laterally by distinct line. Frontal triangle weakly impressed. Frontal carinae sinuate with weakly raised margins; central area weakly concave medially with rather faint frontal furrow. Sides of head in front of eyes straight, converging towards mandibular bases; behind eyes sides rounding into moderately convex occipital margin. Eyes moderately convex, in full face view just reaching or, at most, only marginally breaking lateral cephalic outline. Ocelli lacking; relative position of median ocellus indicated by small pit in cephalic sculpture. Pronotum in dorsal view with humeri obtusely angular. Mesosoma in profile with pronotal dorsum convex; promesonotal suture distinctly impressed; mesonotal dorsum convex, elevated above pronotum; metanotal groove indistinct dorsally, laterally evident as very short furrow; propodeum descending posteriorly in stepped outline, armed with pair of more-or-less distinct tuberculae; declivity very steep. Petiole with anterior face straight, posterior face weakly convex; dorsum armed with four acute spines, lateral pair slightly longer and more slender than dorsal pair. Subpetiolar process angulate anteriorly, widely rounded posteriorly. Anterior face of first gastral segment straight, narrowly rounding onto dorsum of segment.

Mandibles very finely rugose with numerous piliferous pits. Head, mesosoma and gaster shagreened with sides of pronotum and meso- and metapleurae reticulate to reticulate-rugose.

Mandibles with numerous semierect hairs at masticatory borders and very short appressed hairs arising from pits towards mandibular bases. A few long, anteriorly directed setae on clypeal margin medially and a few very short setae laterally. Two pairs of erect hairs arising near anterior clypeal margin; single pair of medium length, somewhat curved hairs on summit of mesonotum. Gaster with short to medium length, erect hairs lining posterior margins of apical segments, more numerous on ventral surfaces. Whole body densely covered with very short, appressed hairs arising from shallow punctures and pits.

Colour. Black, including proximal half of antennal scapes, coxae and tarsi. Mandibles, condylae, distal half of antennal scapes, funiculi, trochanters, femora, tibiae and apex of gaster dark to very dark reddish-brown. Mandibular masticatory borders and tips of apical funicular segments a shade lighter.

Type Material

HOLOTYPE: SOLOMON IS, Guadalcanal, Mt Austen, 09°29’S, 159°59’E, 13.xi.1964, P.J.M. Greenslade #15093 (worker). PARATYPES: data as for holotype (1 worker); data as for holotype, except 21.iv.1965, P.J.M. Greenslade #16888 (3 workers). Holotype and 1 paratype in Australian National Insect Collection, 1 paratype each in The Natural History Museum, Museum of Comparative Zoology and Queensland Museum.

References