Polyrhachis tenebra

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

Kohout 2013c-63Polyrhachis-tenebra had.jpg

The unique holotype of P. tenebra was collected foraging on the ground in savannah woodland. Like most other Hagiomyrma species inhabiting this kind of habitat, it is most likely a ground-nesting species.

Identification

A member of the penelope species-group in the Polyrhachis subgenus Hagiomyrma. Polyrhachis tenebra is somewhat similar to Polyrhachis tanami with their differences discussed in remarks section of the latter species.

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.

  • tenebra. Polyrhachis (Hagiomyrma) tenebra Kohout, 2013: 550, figs. 9G-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

TL c. 6.35; HL 1.62; HW 1.31; CI 81; SL 1.75; SI 133; PW 1.12; MW 0.65; PMI 172; MTL 2.00.

Anterior clypeal margin with shallow, acutely denticulate, median flange. Clypeus with median carina; almost straight in profile, weakly elevated posteriorly; basal margin very shallowly impressed. Frontal carinae sinuate, with narrowly raised margins. Sides of head in front of eyes converging towards mandibular bases in weakly convex line; behind eyes, sides rounding into convex occipital margin. Eyes convex, in full face view marginally exceeding lateral cephalic outline. Ocelli lacking. Pronotal humeri rounded with narrowly raised anterior margins; promesonotal suture distinct. Mesonotum with margins converging towards poorly indicated metanotal groove. Propodeal dorsum armed with slender, horizontal, divergent spines, with tips weakly curved outwards. Petiolar spines widely divergent, obliquely elevated from bases and continued horizontaly towards weakly upturned tips. Anterior face of first gastral tergite widely rounding onto dorsum.

Mandibles finely, longitudinaly striate with piliferous pits. Head, mesosoma and petiole reticulate-punctate with sculpturation relatively fine and uniform. Spines sculptured at bases, smooth and polished towards tips. Gaster shagreened.

Mandibular masticatory and outer borders with numerous, curved, golden hairs; hairs shorter and suberect towards bases. Anterior clypeal margin with a few longer setae medially and fringe of shorter setae laterally. Most body surfaces, including appendages, with numerous, rather short, golden hairs; marginally longer and variously directed hairs on dorsum of mesosoma. Gaster with posteriorly directed hairs on dorsum; somewhat longer hairs on apical segments and venter. Mostly silvery, closely appressed pubescence on head, mesosoma and petiole; pubescence distinct, somewhat longer and pale golden on anterior portion of pronotal dorsum, including humeri. Gastral dorsum with rather abundant, golden pubescence, almost hiding underlying sculpturation; much diluted, silvery pubescence on gastral venter.

Black; mandibles reddish-brown.

Type Material

Etymology

Derived from the Latin tenebrosus, meaning dark, darkness, in reference to its virtually black appearance.

References