Polyrhachis sukarmani

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Polyrhachis sukarmani
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Camponotini
Genus: Polyrhachis
Subgenus: Campomyrma
Species: P. sukarmani
Binomial name
Polyrhachis sukarmani
Kohout, 2007

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Specimen Labels

Like most Campomyrma species, P. sukarmani nests in the ground with the type series specimens ‘hand collected from the ground nest’ (Sukarman Sukimin, pers. comm., 2006).

Identification

Kohout (2007) - Polyrhachis sukarmani resembles Polyrhachis creusa Emery from Australia and New Guinea but differs in several characters. In P. sukarmani the central area between the frontal carinae is distinctly wider and the pronotal dorsum, in lateral view, is weakly convex. In dorsal view, the lateral margins of pronotal and mesonotal dorsa strongly converge posteriorly while the lateral margins of propodeal dorsum are subparallel or only weakly convergent. The petiole of P. sukarmani has the lateral spines reduced to blunt angles and the dorsal margin arcuate and entire. In contrast, the central area between frontal carinae in P. creusa is distinctly narrower and the pronotal dorsum in lateral view is rather flat. In dorsal view, the lateral margins of the mesosomal dorsum, including the propodeum, are strongly posteriorly convergent. The petiole of P. creusa has short and acute lateral spines and its dorsal margin is shallowly but distinctly notched medially.

Distribution

Distribution based on Regional Taxon Lists

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


Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Nomenclature

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

  • sukarmani. Polyrhachis sukarmani Kohout, 2007c: 14, figs. 2, 11, 12 (w.q.) BORNEO.

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

Description

Worker

Dimensions (holotype cited first): TL c. 6.55, 6.30- 6.80; HL 1.72, 1.56-1.75; HW 1.56, 1.40-1.59; CI 91, 88-91; SL 1.84, 1.68-1.87; SI 118, 117-122; PW1.37, 1.22-1.37; MTL 1.81, 1.55-1.87 (6 measured).

Mandibles with 5 teeth. Anterior clypeal margin widely truncate medially, with truncate portion obtusely angulate. Clypeus in profile almost straight with blunt median carina; basal margin only shallowly impressed, laterally indicated by a clearly defined line breaking sculpturation. Frontal triangle distinct. Frontal carinae sinuate, medially with margins weakly raised, posteriorly somewhat converging; central area wide, very weakly convex medially with frontal furrow rather short and flat. Sides of head in front of eyes weakly convex; behind eyes sides rounding abruptly into medially emarginated occipital margin. Eyes distinctly convex, almost protuberant, in full face view clearly breaking lateral cephalic outline. Ocelli lacking. Mesosomal dorsum with deeply impressed promesonotal suture and metanotal groove. Pronotal dorsum transverse, distinctly wider than long, with distinct median depression anteriorly just behind pronotal collar; humeri armed with obtuse teeth and weakly raised anterior margins; lateral margins weakly rounding into promesonotal suture; mesosomal dorsum with lateral margins strongly converging posteriorly. Propodeal dorsum transverse, lateral margins posteriorly terminating in upturned, inward directed ridges that meet medially and form a continuous transverse carina separating propodeal dorsum from relatively high, virtually vertical declivity. Petiole scale-like, rather slim in profile and narrow in dorsal view; dorsal margin arcuate, obtusely angular laterally. Anterior face of first gastral segment concave, with rather narrow antero-dorsal margin rounding onto dorsum of gaster.

Mandibles finely, mostly longitudinally striate with numerous piliferous pits. Clypeus and central area anteriorly reticulate-punctate; sides of head and vertex distinctly, more-or-less regularly, longitudinally striate. Pronotal and propodeal dorsa rather regularly, longitudinally striate with striae on mesonotum distinctly converging posteriorly; sides of mesosoma and petiole finely reticulate. Gaster very finely shagreened.

Mandibular masticatory borders with numerous curved, golden hairs. Anterior clypeal margin with several long setae medially and fringe of very short setae lining margin laterally. Numerous, medium length, erect hairs on clypeus; several paired, medium length, erect hairs along frontal carinae; one pair of anteriorly directed hairs on vertex. Fore coxae with a few long, somewhat curved hairs on anterior face and several short hairs on posterior face; one or two longer hairs on ventral surfaces of middle and hind coxae, trochanters and femora. Gaster dorsally with only a few medium length hairs lining apical segments; hairs more abundant on gastral venter. Very short, closely appressed, rather diluted pubescence distributed over most of head and gaster.

Black; narrow band at mandibular masticatory border, antennal scapes and legs dark to very dark reddish-brown; funiculi dark brown at their bases, with subsequent segments progressively lighter towards funicular apices; condylae yellow. Ventral gastral apex blotched reddish-brown.

Queen

Dimensions: TL c. 8.52; HL 2.00; HW 1.68; CI 84; SL 2.00; SI 119; PW 1.65; MTL 2.18 (1 measured).

A single queen similar to worker with usual differences indicating caste, including three ocelli and complete thoracic structure. Sculpturation of head and body virtually identical to worker with direction of striae following structural characteristics of fully developed mesosoma. Pilosity and colour identical to that in worker.

Type Material

HOLOTYPE: EAST MALAYSIA, SABAH, Meliau Range, 05º49’N, 117º07’E, 95m, viii. 2004, Sukarman & Sarina (ITBC-USM 2004 Exp.) (worker).

PARATYPES: data as for holotype (12 workers). Type deposition: Holotype and 7 paratypes in ITBC; 2 paratypes in QMBA; 1 paratype each in Australian National Insect Collection, The Natural History Museum and Museum of Comparative Zoology.

Etymology

Named in honour of the collector of the type series, Sukarman Sukimin of the ITBC, Universiti Malaysia Sabah.

References