Polyrhachis feehani

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Polyrhachis feehani
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. feehani
Binomial name
Polyrhachis feehani
Kohout, 2013

Kohout 2013c-40Polyrhachis-feehani had.jpg

Polyrhachis feehani appears to be rather rare and has been collected only on a few occasions. Its distribution is apparently limited to the wider Cooktown area.

Identification

A member of the ammon species-group in the Polyrhachis subgenus Hagiomyrma. Kohout (2013) - Polyrhachis feehani is superficially similar to several species, including Polyrhachis brisbanensis, Polyrhachis brutella, Polyrhachis burwelli, Polyrhachis darlingtoni and Polyrhachis dougcooki, which are all large and have a very obvious, reddish-golden, median patch on the gastral dorsum. It differs from most of them by its weakly anteriorly converging pronotal margins, a character shared only with P. darlingtoni. Both species are easily distinguished by the shape of their petioles.

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

Sexuals unknown. Immature stages present in the ANIC collection.

Nomenclature

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

  • feehani. Polyrhachis (Hagiomyrma) feehani Kohout, 2013: 520, figs. 4A-B (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. 11.24, 10.78-11.79; HL 2.65, 2.56-2.74; HW 2.06, 1.96-2.12; CI 78, 73-80; SL 3.53, 3.33-3.68; SI 171, 164-176; PW 1.75, 1.71- 1.90; MW1.28, 1.21-1.31; PMI 137, 137-154; MTL 4.18, 4.03-4.43 (13 measured).

Anterior clypeal margin with shallow, emarginate, obtusely denticulate, median flange. Clypeus with median carina, weakly sinuate in profile, posteriorly rounding into shallow basal margin. Frontal carinae sinuate with distinctly raised margins. Sides of head in front of eyes almost straight towards mandibular bases; behind eyes, sides rounding into convex occipital margin. Eyes moderately convex, in full face view only reaching, or marginally exceeding lateral cephalic outline. Ocelli lacking. Pronotal dorsum with humeri rounded; lateral margins notched and weakly divergent towards promesonotal suture. Mesonotum with lateral margins converging towards poorly indicated metanotal groove. Propodeal dorsum armed with rather strong, weakly divergent spines, with tips curved upwards and outwards. Petiole armed with pair of weakly divergent, acute spines. Anterior face of first gastral tergite widely rounding onto dorsum. First gastral tergite somewhat transverse with sides produced into blunt prominences, somewhat similar to, but less distinct than those in P. vernoni described below.

Mandibles closely longitudinally striate with numerous piliferous pits. Head, mesosoma and petiole distinctly reticulate-punctate, with sculpturation between eyes and frontal carinae organised into fine, longitudinal striae, converging anteriorly and obliquely on clypeus and meeting along median carina. Mesosomal dorsum with reticulae somewhat organised more regularly into striate rugulations, anteriorly directed along promesonotal suture, bowed and forming more-or-less incomplete semicircles on mesonotal and propodeal dorsa. Gaster shagreened.

Mandibles at masticatory borders and towards bases with numerous golden hairs. Anterior clypeal margin with several, anteriorly projecting setae medially and fringe of short setae laterally. Clypeus and sides of head with very short, appressed, silvery hairs arising from numerous shallow pits. Medium length, anteriorly inclined, silvery hairs between frontal carinae, increasing in density on vertex. Dorsa of mesosoma and petiole with rather dense cover of mostly erect or variously curved, long hairs, most longer than greatest diameter of eyes. Gaster with long, posteriorly directed hairs, silvery on venter and sides, golden on dorsum. Somewhat untidy, silvery, appressed pubescence in various densities over most body surfaces. Dorsum of gaster with distinctly longer, golden, appressed pubescence and very distinct, dark reddish-brown, laterally diffused, median patch; pubescence more silvery on sides and venter of gaster.

Black; mandibles black with narrow, reddish-brown band along masticatory border; teeth black. Appendages and venter of gaster reddish-brown.

Type Material

Etymology

Named in honor of the collector of the type series specimens, J. Feehan of the ANIC, CSIRO Ecosystem Sciences, Canberra.

References