Polyrhachis vernoni

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Polyrhachis vernoni
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Camponotini
Genus: Polyrhachis
Subgenus: Hagiomyrma
Species group: ammon
Species: P. vernoni
Binomial name
Polyrhachis vernoni
Kohout, 2013

Kohout 2013c-40Polyrhachis-vernoni had.jpg

This is one of only a few rainforest dwelling members of the subgenus Hagiomyrma, with most specimens known collected foraging on the ground and large boulders at the summit and slopes of Mt Tozer in Iron Range National Park.

Identification

A member of the ammon species-group in the Polyrhachis subgenus Hagiomyrma. Kohout (2013) - Polyrhachis vernoni is a very distinct species, easily separated from all other Hagiomyrma by the unique, distinctly raised, angular margins of pronotal humeri and the strongly transverse first gastral tergite with blunt lateral prominences.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Australasian Region: Australia (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Known only from the worker caste.

Nomenclature

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

  • vernoni. Polyrhachis (Hagiomyrma) vernoni Kohout, 2013: 524, figs. 4G-H (w.) AUSTRALIA.

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

Description

Worker

(holotype cited first): TL c. 11.04, 11.04-11.74; HL 2.56, 2.56-2.78; HW 1.84, 1.84-2.00; CI 72, 70-73; SL 3.17, 3.17-3.48; SI 172, 167-178; PW 1.68, 1.68- 1.84; MW 1.12, 1.12-1.22; PMI 150, 146-160; MTL 3.88, 3.88-4.28 (12 measured).

Anterior clypeal margin with shallow, obtusely denticulate, median flange, laterally flanked by blunt angles. Clypeus with median carina; sinuate in profile, posteriorly rounding into well impressed basal margin. Frontal triangle indistinct. Frontal carinae sinuate with distinctly raised margins; central area relatively wide with distinct median carina. Sides of head in front of eyes converging towards mandibular bases in straight line; behind eyes, sides Eyes convex, in full face view exceeding lateral cephalic outline. Ocelli lacking. Pronotal humeri produced into dilated, angular prominences with distinctly raised margins; lateral margins behind humeri weakly raised, subparallel towards well impressed promesonotal suture. Mesonotal lateral margins weakly raised for most of length; posteriorly converging towards indistinct metanotal groove. Propodeal margins terminating in rather strong, divergent spines, obliquely raised from bases in side view and sinuate towards weakly upturned tips. Petiole with dorsum shallowly concave medially, armed with divergent, horizontal spines. First gastral tergite distinctly transverse, in dorsal view with sides produced into somewhat bluntly elevated, shoulder-like prominences.

Mandibles finely, longitudinally striate with numerous piliferous pits. Head, mesosoma and petiole reticulate-puncate; spines sculptured at bases, smooth and polished towards tips. Gaster shagreened.

Mandibular masticatory borders with numerous, curved, golden hairs and short, appressed hairs towards bases. Anterior clypeal margin with a few longer, anteriorly projecting setae medially and numerous, short setae, fringing margin laterally. Clypeus with only a few, paired, rather short, semierect hairs; central area and vertex with numerous, medium length, anteriorly directed, golden hairs, but no hairs breaking lateral cephalic outline between eyes and mandibular bases in full face view. Leading edges of antennal scapes with a few, semierect, short, bristle-like hairs. Dorsum of mesosoma, gaster and anterior face of fore coxae, with numerous, erect or variously curved, golden hairs, some as long as greatest diameter of eyes; somewhat shorter hairs on dorsum of petiole, mid and hind coxae and venter of femora; hairs more diluted and anteriorly directed on venter of gaster. Relatively long, appressed, somewhat untidy, golden pubescence on dorsum of head, mesosoma and petiole; pubescence distinctly shorter and much diluted on clypeus and sides of head and mesosoma. Dorsum of gaster with abundant, golden pubescence and very distinct, dark, reddish-brown median patch, extending posteriorly along first and second tergite; pubescence more diluted and silvery on gastral venter.

Black; mandibular masticatory borders, appendages and venter of gaster medium to dark reddish-brown.

Type Material

Type deposition: Holotype and 2 paratypes in Queensland Museum; 2 paratypes each in Australian National Insect Collection, The Natural History Museum, Museum of Comparative Zoology; 1 paratype in Musee d'Histoire Naturelle Genève.

Etymology

Named in honour of the collector of the holotype, Donald P. Vernon, formerly of the Queensland Museum, Brisbane, who was the only Australian member of the 1948 Archbold Expedition to Cape York.

References