Polyrhachis roomi

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

Polyrhachis roomi casent0009234 p 1 high.jpg

Polyrhachis roomi casent0009234 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of Polyrhachis roomi.

Identification

Kohout (2007) - This species is easily recognisable by its relatively large size.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: New Guinea (type locality).

Check distribution from AntMaps.

Distribution based on specimens

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The above specimen data are provided by AntWeb. Please see Polyrhachis roomi for further details

Biology

The subgenus this species is a member of, Aulacomyrma, is poorly colected. Kohout (2007) summarized what is known about their biology in a revision of the species in the subgenus. This offers an explanation as to why most Aulacomyrma are known from few collections and specimens. There are only two records of nests being found. A small colony of Polyrhachis dohrni was collected by Kohout from a dry hollow twig on a living tree at the edge of lowland rainforest. The internal walls of the twig cavity were lined with a little silk. Ward collected a nest of Polyrhachis wardi from a dry twig of a rainforest tree. The colonies of both species were rather small, with only a few workers (5 and 11 respectively, including 2 and 3 alate queens and a single male). If such a nesting pattern is the norm for other species of the subgenus, that might explain the general scarcity of Aulacomyrma material even in the best collections. Many Aulacomyrma species are described and only known from a holotype.

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.

  • roomi. Polyrhachis (Aulacomyrma) roomi Kohout, 2007a: 236, figs. 100, 103, 106 (w.) NEW GUINEA.

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. 6.05-6.60 (6.60); HL 1.50-1.72 (1.56); HW 1.28-1.50 (1.34); CI 85-88 (86); SL 1.56-1.72 (1.59); SI 115-126 (119); PW 1.03-1.18 (1.06); MTL 1.53-1.68 (1.59) (5 measured).

Anterior clypeal margin distinctly emarginate medially, dentate on each side of emargination; clypeus with weakly raised longitudinal carina, almost straight in profile; basal margin weakly impressed and indicated laterally by faint line breaking cephalic sculpture. Frontal carinae with strongly sinuate and distinctly raised laminate lobes. Sides of head convex. Eyes virtually flat, situated well forward on sides of head; inner margins somewhat sunk into shallow concavity in cephalic sculpture; not or only just reaching lateral cephalic outline in full face view. Mesosoma with pronotal and propodeal dorsa laterally immarginate; mesonotal dorsum with outermost striae forming short margin. Pronotal humeri armed with short, laterally and anteriorly directed, horizontal spines. Promesonotal suture rather shallow, indicated by change in direction of sculpture; metanotal groove lacking. Propodeal dorsum separated from declivity by faint posterior border that, viewed from behind, forms inverse ‘V’ terminating laterally in small denticles. Dorsal petiolar margin with pair of acute intercalary teeth medially, shallowly emarginate between them; laterally margin somewhat jagged, lateral teeth acute, weakly upturned. Anterior face of first gastral segment shallowly concave, narrowly rounding onto dorsum of segment.

Mandibles densely, rather finely, longitudinally striate. Dorsum of head with mostly regular striae; longitudinal and anteriorly converging on clypeus, obliquely curving from sides of head towards basal clypeal margin, transverse and anteriorly bowed on vertex with outermost striae converging towards central area between frontal carinae. Pronotal dorsum mostly regularly, transversely striate; striae curving vertically onto sides. Striae on mesonotal-propodeal dorsum transverse, bowed posteriorly into open U-shapes; sides with striae more-or-less horizontal. Petiole and gaster finely shagreened.

Dorsum of head and mesosoma with medium length, mostly erect, off-white or yellowish hairs; hairs somewhat posteriorly curved and golden on gastral dorsum, distinctly longer along sternites and on gastral apex. Appressed pubescence much reduced on head and mesosomal dorsum, only patches of sparse, off-white or silvery pubescence on sides of propodeum, along propodeal declivity, petiole and coxae. Golden and rather dense gastral pubecence mostly confined to dorsum of first segment, not completely concealing underlying sculpture.

Black; most of antennal scapes, basal half of first funicular segment, joints of femora and tibiae, bases of basal tarsal segments and gaster dark to very dark reddish-brown. Mandibular masticatory border, basal and distal ends of antennal scapes, funiculi and most of legs light to very light reddish-yellow.

Type Material

HOLOTYPE: PAPUA NEW GUINEA, Northern Prov., Sangara, 18.xii.1971, P. M. Room (worker). PARATYPES: data as for holotype (4 workers). Type distribution: holotype in Australian National Insect Collection, 1 paratype each in The Natural History Museum, California Academy of Sciences, Museum of Comparative Zoology and Queensland Museum.

Etymology

Named in honour of the collector, Dr Peter M. Room of CSIRO, Division of Entomology, Indooroopilly, Queensland, Australia, who collected scores of ants, many new to science, during the years of his appointment as an agricultural entomologist in Papua New Guinea.

References