Polyrhachis aculeata

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Polyrhachis aculeata
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Camponotini
Genus: Polyrhachis
Subgenus: Myrma
Species group: aculeata
Species complex: aculeata
Species: P. aculeata
Binomial name
Polyrhachis aculeata
Mayr, 1879

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Specimen Label

Nothing is known about the biology of Polyrhachis aculeata.

Identification

A member of the Polyrhachis aculeata species group in the subgenus Myrma

Kohout (2008) - Polyrhachis aculeata, Polyrhachis cybele, Polyrhachis gibbosa and Polyrhachis hemiopticoides are all quite similar. The characters separating these four species include the degree to which the posterior blinkers of the eyes are developed, general pilosity and the shape and length of the pronotal and petiolar spines. In P. aculeata and P. hemiopticoides the eyes are strongly truncate and the pronotal and petiolar spines rather long and slender. Polyrhachis aculeata has all the body surfaces covered with numerous, relatively long, erect or semierect hairs and the legs and base of the gaster reddish-brown. In P. hemiopticoides hairs are present only on the head and over the gastral apex, and the gaster and tarsi are black with only the femora and tibiae reddish-brown. Polyrhachis gibbosa differs from both species and also from P. cybele by its distinctly less truncate eyes, stubby body, shorter and thicker petiolar spines and the presence of a distinct pile of short, silvery or whitish, appressed pubescence that is abundant over most of the body surfaces, except the vertex, midline of the mesosoma and gastral dorsum. Polyrhachis gibbosa is apparently limited to Sri Lanka, while P. aculeata and P. hemiopticoides are known from India, with the latter also reported from Laos. Polyrhachis cybele occurs on Borneo, Sumatra and Sulawesi.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: Philippines.
Oriental Region: India (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Worker

Nomenclature

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

  • aculeata. Polyrhachis aculeata Mayr, 1879: 657 (w.) INDIA. Emery, 1887a: 235 (q.); Forel, 1893c: 28 (m.). Combination in Hemioptica: Bingham, 1903: 382; in P. (Hemioptica): Wheeler, W.M. 1919e: 126; in P. (Myrma): Emery, 1925b: 205; Dorow & Kohout, 1995: 94.

Description

Worker

Kohout (2013): Dimensions (holotype cited first): TL c. (gaster missing), 6.40-6.80; HL 1.59, 1.59-1.75; HW 1.43, 1.36-1.43; CI 84, 81-84; SL 1.93, 1.93-2.03; SI 144, 142-149; PW 1.30, 1.12-1.30; MTL 2.06, 2.06-2.21 (1+2 measured).

Type Material

Kohout (2013): I have examined two worker specimens of P. aculeata from the Mayr collection in Vienna (Naturhistorisches Museum Wien, Vienna), neither labelled as the type. However, in the original description Mayr noted ‘Ich besitze nur ein Exemplar aus Ostindien, welches ich Herrn Professor Schmidt-Göbel verdanke.’ I have therefore considered the specimen bearing a tag inscribed ‘Ind. or. Schm.’ to be the holotype of P. aculeata and labelled it accordingly. The specimen bears two additional, original labels as follows: ‘P. aculeata det. G. Mayr’ and ‘Collect. G. Mayr’. The specimen is pinned and missing the gaster, but otherwise is in relatively sound condition.

References