Polyrhachis hemiopticoides

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Polyrhachis hemiopticoides
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. hemiopticoides
Binomial name
Polyrhachis hemiopticoides
Mukerjee, 1930

Identification

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

Polyrhachis hemiopticoides is a rather elegant species closely resembling both Polyrhachis aculeata and Polyrhachis cybele. It shares with the former a slender body with rather long and slender pronotal and petiolar spines and markedly light, reddish brown appendages. In contrast, P. cybele is more robust with thicker and shorter pronotal and petiolar spines and has generally very dark appendages. The petiole in P. hemiopticoides and P. cybele is broadly transverse, with a distinctly arcuate dorsal edge and dorsolateral spines arising obliquely from close to the posterior face of the petiole. As a result, the dorsal edge of the petiole is clearly visible in lateral view. In comparison, the dorsal edge of the petiole in P. aculeata is less prominent and, in lateral view, is hidden by the more upright dorsolateral spines. Polyrhachis aculeata also differs by the presence of numerous, relatively long, erect or semierect hairs that, in both the other species, are distinctly less abundant and virtually confined to the head and gaster (see also Kohout 2008: 258, 271).

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Oriental Region: India (type locality), Laos, Thailand.

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Sexuals and immature stages unknown.

Nomenclature

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

  • hemiopticoides. Polyrhachis (Myrma) hemiopticoides Mukerjee, 1930: 161, fig. 5 (w.) INDIA.

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

Description

Kohout (2013): Worker. Dimensions: TL c. 6.55-7.31; HL 1.68-1.81; HW 1.40-1.56; CI 83-86; SL 2.03-2.06; SI 132-145; PW 1.18-1.28; MTL 2.12-2.21 (3 measured).

Type Material

Kohout (2013): I did not have the opportunity to examine the syntypes of P. hemiopticoides lodged in the Indian Museum in Calcutta. In lieu of the original types, I have examined, by the courtesy of Dr Himender Bharti of Punjabi University, Patiala, India (PUPI), a specimen from Ayur identified by the original author (see Mukerjee 1934: 11-12).

References

  • Kohout, R.J. 2013. A review of the Polyrhachis aculeata species-group of the subgenus Myrma Billberg (Hymenoptera: Formicidae: Formicinae), with keys and descriptions of new species. Australian Entomologist, 40, 137-171.
  • Mukerjee, D. 1930. Report on a collection of ants in the Indian Museum, Calcutta. J. Bombay Nat. Hist. Soc. 34: 149-163 (page 161, fig. 5 worker described)