Polyrhachis stricta

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Polyrhachis stricta
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. stricta
Binomial name
Polyrhachis stricta
Kohout, 2013

Kohout 2013c-63Polyrhachis-stricta had.jpg

Polyrhachis stricta is known only from two specimens found foraging on the ground and low vegetation at the type locality.

Identification

A member of the penelope species-group in the Polyrhachis subgenus Hagiomyrma. Kohout (2013) - Polyrhachis stricta somewhat resembles Polyrhachis placida as they have similar colour patterns. However, the clypeus in P. stricta is almost straight in lateral view with the basal margin only shallowly impressed, while in P. placida the profile of the clypeus is distintly sinuate and the basal margin deeper. The promesonotal lateral margins in P. stricta are strongly converging posteriorly (PMI >190) with the propodeal spines weakly upturned. In contrast, in P. placida the promesonotal margins coverge less strongly (PMI <168) and the propodeal spines curve downwards from their midlength. The pilosity in P. placida is also distintly longer and mostly silvery with the pubescence somewhat less tidy, notably over the gastral dorsum.

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.

  • stricta. Polyrhachis (Hagiomyrma) stricta Kohout, 2013: 547, figs. 9C-D (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. 6.35, 5.95; HL 1.65, 1.56; HW 1.31, 1.22; CI 79, 78; SL 1.84, 1.72; SI 140, 141; PW 1.12, 1.09; MW 0.59, 0.56; PMI 190, 195; MTL 2.03, 1.90 (2 measured).

Anterior clypeal margin with denticulate median flange. Clypeus with distinct median margin only very shallowly impressed. Frontal carinae sinuate with narrowly raised margins; central area with rather flat frontal furrow. Sides of head in front of eyes only weakly converging towards mandibular bases; behind eyes, sides widely rounding into convex occipital margin. Eyes convex, in full face view clearly breaking lateral cephalic outline. Ocelli lacking. Pronotal dorsum with humeri bluntly angular; promesonotal lateral margins narrowly raised, distinctly converging posteriorly. Promesonotal suture distinctly impressed; metanotal groove indicated by a notch in lateral margins, indistinct dorsally. Propodeal lateral margins terminating in distinctly divergent, weakly upturned, acute spines; dorsum descending into declivity in weakly convex line. Petiole with a pair of slender, divergent, upturned, acute spines. Anterior face of first gastral segment widely rounding onto dorsum.

Mandibles finely striate with numerous piliferous pits. Head, mesosoma and petiole distinctly and closely, rather uniformly, reticulate-punctate. Gaster finely shagreened.

Mandibles at masticatory and outer borders with curved, golden hairs and closely appressed shorter hairs towards bases. Anterior clypeal margin with several longer setae medially and fringe of shorter setae laterally. Numerous, mostly erect hairs on clypeus and along frontal carinae; distinctly shorter hairs on sides of head and vertex. Dorsum of mesosoma with numerous erect or suberect hairs, hairs on propodeum half as long as greatest diameter of eye. Gaster dorsally and ventrally with numerous posteriorly directed, relatively long, golden hairs. Rather sparse pale golden or silvery, closely appressed pubescence on head and mesosoma, more abundant on meso- and metapleura, propodeal declivity and petiole. Gastral dorsum with rich golden pubescence almost hiding underlying sculpturation; pubescence silvery and less abundant on gastral venter.

Black; mandibles, clypeal flange (except narrow anterior margin), antennae, pronotal collar, legs, including coxae, light to medium reddish-brown; tibiae and gastral venter distinctly darker reddish-brown.

Type Material

Etymology

Derived from the Latin strictus, meaning drawn together, tight, in reference to its distinctly posteriorly constricting promesonotal dorsum.

Determination Clarifications

Polyrhachis stricta and Polyrhachis placida were both listed earlier as ‘Hagio 17’ by Kohout (2000: 200).

References