Polyrhachis storki

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Polyrhachis storki
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Camponotini
Genus: Polyrhachis
Subgenus: Myrmhopla
Species group: flavoflagellata
Species: P. storki
Binomial name
Polyrhachis storki
Kohout, 2008

Polyrhachis storki casent0103183 profile 1.jpg

Polyrhachis storki casent0103183 dorsal 1.jpg

Specimen labels

Polyrhachis storki is a widespread but uncommon species.

Identification

A member of the Polyrhachis flavoflagellata species group.

Like Polyrhachis flavoflagellata, P. storki is a widespread but rare species. They are superficially very similar, but undoubtedly distinct. Distinguishing characters include the relative length of the antennal scapes (SI <117 in P. storki versus SI >122 in P. flavoflagellata) and the shape of the anterior clypeal margin. The clypeus of Polyrhachis storki has a bilobed, medially emarginate prominence, while the anterior clypeal margin in P. flavoflagellata is widely truncate with a minute median incision. Polyrhachis storki has a widely rounded petiolar dorsum that bears only a pair of lateral, very weakly elevated spines. In P. flavoflagellata the petiolar dorsum is rather narrow and bears a pair of dorsolaterally directed spines as well as a pair of distinct intercalary teeth.

Keys including this Species

Distribution

From Peninsular Malaysia to Borneo and south to Sulawesi (Kohout, 2008).

Distribution based on Regional Taxon Lists

Indo-Australian Region: Borneo, Indonesia (type locality), Malaysia, Sulawesi.

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Only known from worker caste.

Nomenclature

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

  • storki. Polyrhachis storki Kohout, 2008a: 298, figs. 9C-D (w.) INDONESIA (Sulawesi).

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. 6.85, 6.40-7.00; HL 1.72, 1.65-1.75; HW 1.53, 1.47-1.56; CI 89, 89-91; SL 1.72, 1.68-1.81; SI 112, 112-117; PW 1.12, 1.06-1.15; MTL 2.18, 2.12-2.31 (6 measured).

Anterior clypeal margin produced medially into a bilobed, deeply emarginate prominence. Clypeus with blunt, weakly indicated median carina; clypeus in profile very weakly sinuate, shallowly impressed anteriorly, weakly elevated posteriorly with flat, clearly defined basal margin. Frontal triangle distinct. Frontal carinae sinuate, virtually flat, with very weakly raised margins; central area relatively wide, flat; frontal furrow indicated by break in sculpture. Sides of head in front of eyes distinctly converging anteriorly, almost straight, only weakly rounding into mandibular bases; behind eyes strongly rounding into virtually flat occipital margin. Eyes large, weakly convex, in full frontal view situated at posterolateral corners and distinctly breaking lateral cephalic outline. Ocelli lacking. Pronotal humeri armed with distinct, acute teeth. Mesosomal dorsum in profile with distinct, but flat promesonotal suture; metanotal groove indistinct dorsally, weakly indicated laterally; mesonotal and propodeal dorsa almost flat, with poorly defined, blunt, lateral margins. Propodeum armed with pair of dorsoposteriorly directed spines; declivity short, oblique in profile. Petiolar dorsum armed with pair of dorsolaterally directed spines. Anterior face of first gastral segment relatively low with base weakly concave; anterodorsal margin widely rounded.

Mandibles finely, longitudinally striate with numerous piliferous pits. Head, mesosoma and petiole finely and closely reticulate-punctate with sculpturation along occipital margin and on propodeal dorsum somewhat tranversely reticulate, wrinkled. Antennal scapes, legs and gaster more finely reticulate-punctate.

Mandibular masticatory borders with several curved, pale golden hairs. Anterior clypeal margin with single, medium long seta medially and several shorter setae fringing margin laterally. Apex of antennal scapes with very few short hairs. Gaster with only few, short, erect hairs at margins of apical dorsal segments, with somewhat longer hairs lining segments on ventral surfaces. Pale golden, short, closely appressed pubescence in various densities over most body surfaces, notably on mesosoma, petiole and gaster, but nowhere so dense as to hide underlying sculpturation. Pubescence most diluted on head, where it is almost completely absent from clypeus, sides and frontal area, except some scattered, extremely short, appressed hairs raising from piliferous pits.

Colour. Generally dark brown-black with somewhat reddish-brown, almost metalic, hue. Mandibular teeth narrowly reddish-brown; condylae, extreme tip of apical funicular segments and tarsal claws yellowish-brown. Legs very dark reddish-brown with distal portion of front tibiae shade lighter.

Type Material

HOLOTYPYPE: SULAWESI UTARA: Dumoga-Bone NP, 25.ii.1985, mangrove fog., N.E. Stork et al. (worker). PARATYPES: data as for holotype (1 worker). SULAWESI TENGAH: Lore Lindu NP, Toro, Watu Bohe, 860m, 14.iv.2005, cacao agrof., M.M. Bos #34 (1 worker). EAST MALAYSIA, SABAH: Kinabalu Park, Poring, c. 600m, vii.1991, M. Dill (1 worker). WEST MALAYSIA: Negara Sembilan, Pasoh FRFR, xi.1994, fog., M. Brendell, K. Jackson & S. Lewis (3 workers).

Type deposition: Holotype and 1 paratype in The Natural History Museum, 1 paratype each in Australian National Insect Collection, FIS, Museum of Comparative Zoology and Queensland Museum.

References