Polyrhachis menozzii

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Polyrhachis menozzii
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Camponotini
Genus: Polyrhachis
Subgenus: Myrmatopa
Species: P. menozzii
Binomial name
Polyrhachis menozzii
Karavaiev, 1927

Polyrhachis menozzii casent0912147 p 1 high.jpg

Polyrhachis menozzii casent0912147 d 1 high.jpg

Specimen Labels

Polyrhachis menozzii builds polydomous nests from silk and vegetation debris upon the leaves of rainforest trees apparently high above ground, with both available nests from PNG collected from the canopy of recently felled rainforest trees (Kohout, 2012).

Identification

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Australasian Region: Australia.
Indo-Australian Region: Indonesia (type locality), New Guinea.

The only specimens of P. menozzii known from Australia are numerous alate queens from light traps set in lowland rainforest at Lockerbie Scrub and Bamaga. Their identity has been confirmed by comparison with the syntypes of the species and worker-associated queens from a nest series from PNG. The distribution of P. menozzii appears to be centred on New Guinea, with the type series specimens collected on the Aru Islands.

Check distribution from AntMaps.

Distribution based on specimens

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

Biology

Castes

Immature stages in ANIC spirit collection. (Kohout 2012)

Nomenclature

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

  • menozzii. Polyrhachis (Myrmatopa) menozzii Karavaiev, 1927e: 9, fig. 2 (w.q.) INDONESIA (Aru I.). See also: Kohout, 2012: 45.

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

Description

Worker

Kohout (2012) - (syntype cited first): TL c. 8.57, 7.56-8.67; HL 2.18, 2.06-2.25; HW 1.87, 1.75-1.93; CI 86, 85-86; SL 2.50, 2.43-2.53; SI 134, 131-139; PW 1.22, 0.97-1.22; MTL 3.12, 2.96-3.24 (1+4 measured).

Anterior clypeal margin medially with wide, deep, ‘V’shaped emargination, delimited laterally by acute teeth. Clypeus with median carina; virtually straight in profile, posteriorly rounding into distinctly impressed basal margin. Frontal triangle distinct. Frontal carinae sinuate with steeply raised margins; central area flat with frontal furrow partly obscured by cephalic sculpturation. Sides of head in front of eyes converging towards mandibular bases in virtually straight line; behind eyes sides rounding into weakly convex occipital margin. Eyes convex, in full face view clearly exceeding lateral cephalic outline. Ocelli lacking. Pronotal dorsum flat; humeri with short, rather blunt, somewhat upturned spines; their lateral edges continuous with posteriorly converging, lateral pronotal margins. Promesonotal suture distinct; mesonotal dorsum flat in profile with weakly raised lateral margins. Metanotal groove distinct; propodeal dorsum with subparallel, somewhat dorsally raised lateral margins, terminating posteriorly in moderately long, strongly oblique, acute spines; propodeal dorsum between spines rounding into weakly concave declivity in medially uninterrupted line. Petiole with anterior face straight, posterior face convex; armed with two, relatively long, widely diverging acute spines; dorsal margin between spines with distinct, acute, intercalary tooth. Anterior face of first gastral segment flat at base, widely rounding onto dorsum.

Mandibles very finely longitudinally striate with numerous piliferous pits. Head and dorsum of mesosoma rather coarsely and deeply reticulate punctate, with rugae on clypeus mostly longitudinally directed. Sides of mesosoma and petiole distinctly less coarsely sculptured. Antennae and legs finely and closely reticulate-punctate. Gaster finely shagreened, polished.

Mandibular masticatory borders with several relatively long, curved, golden hairs. Anterior clypeal margin with a single long seta and a pair of shorter setae within median emargination and numerous shorter setae lining margin laterally. A few paired, semierect, medium length, yellow hairs near anterior and basal clypeal margins and in central area along frontal carinae. Several relatively long hairs on fore coxae; somewhat shorter hairs on venter of trochanters and femora. Gaster with several hairs lining dorsoposterior margins of apical segments; distinctly longer and more numerous hairs on gastral venter. Appressed, very short, yellowish or off-white, rather diluted pubescence on dorsum of gaster; pubescence virtually absent from other body surfaces.

Colour. Black. Mandibles distinctly lighter, reddish-brown, towards masticatory borders; teeth black. Antennal scapes and basal funicular segments very dark reddish-brown, subsequent segments progressively lighter towards antennal apices. Legs, including coxae, black or very dark reddish-brown. Gaster very dark, virtually black, dorsally; sides and margins of segments on venter a shade lighter with somewhat reddish tint.

Queen

Kohout (2012) - Dimensions: TL c. 9.12-11.69; HL 2.28- 2.65; HW 2.06-2.21; CI 82-90; SL 2.46-2.90; SI 119- 133; PW 1.96-2.25; MTL 2.93-3.63 (8 measured). Apart from sexual characters, closely resembling worker except: pronotal humeri with rather short, blunt teeth; mesoscutum wider than long, with lateral margins converging anteriorly, forming moderately rounded anterior margin; median line distinct; parapsides flat; anterior face of mesoscutum in lateral view widely rounding onto flat dorsum. Mesoscutellum with flat dorsum, only marginally elevated above dorsal plane of mesosoma. Propodeum armed with obliquely directed spines. Petiole with lateral spines marginally shorter and intercalary tooth stronger and more distinct than in worker. Sculpturation and colour virtually identical to worker.

Type Material

Syntype workers and queen from Wammar, Aru Island, Indonesia, 16.iii.1913 (V. Karavaiev #2596 for w, #2982 for queen) (IZAS, Queensland Museum) (examined by Kohout, 2012).

References

  • Karavaiev, V. 1927f. Ameisen aus dem Indo-Australischen Gebiet. III. Zb. Prats Zool. Muz. 3:3-52 [= Tr. Ukr. Akad. Nauk Fiz.-Mat. Vidd. 7:3-52]. (page 9, fig. 2 worker, queen described)
  • Kohout, R.J. 2012. A review of the Australian Polyrhachis ants of the subgenera Myrma Billberg, Myrmatopa Forel, Myrmothrinax Forel and Polyrhachis Fr. Smith (Hymenoptera: Formicidae: Formicinae). Memoirs of the Queensland Museum – Nature 56(1):25-59.