Polyrhachis gibbosa

Polyrhachis gibbosa
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. gibbosa
Binomial name
Polyrhachis gibbosa Forel, 1908 Specimen Labels

Identification

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

Kohout (2013): Polyrhachis gibbosa differs from the other species of the aculeata complex by the dorsal body surfaces being only partly polished and the mesonotum and propodeum being more distinctly sculptured. The mesosoma also appears somewhat shorter and relatively broad, with the pronotal spines only about as long as the width at their bases and the mesosomal dorsum is highly convex in lateral view. The body is entirely black with rather abundant, silvery, appressed pubescence, notably on the pronotal collar and along the dorsolateral margins and sides of the mesosoma.

Keys including this Species

• Key to Polyrhachis aculeata group species
• Key to Polyrhachis of India

Distribution

Latitudinal Distribution Pattern

Latitudinal Range: 6.406° to 6.333333333°.

North Temperate	North Subtropical	Tropical	South Subtropical	South Temperate

• Source: AntMaps

Distribution based on Regional Taxon Lists

Oriental Region: Sri Lanka (type locality).

Distribution based on AntMaps

Distribution based on AntWeb specimens

Check data from AntWeb

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.

Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.

Nomenclature

The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

• gibbosa. Polyrhachis aculeata var. gibbosa Forel, 1908a: 9 (w.) SRI LANKA. Forel, 1913k: 139 (footnote) (q.). Combination in P. (Myrma): Emery, 1925b: 205. Raised to species: Kohout, 2008a: 258.

Type Material

• Syntype, workers, Puwakpitiya, Sri Lanka, 1906-7, E. Bugnion, Musee d'Histoire Naturelle Genève; (see Kohout, 2013).

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

Description

Worker

Kohout (2013): Dimensions (syntypes): TL c. 5.85-6.35; HL 1.59-1.62; HW 1.31-1.37; CI 82-84; SL 1.87-1.93; SI 141-143; PW 1.18-1.25; MTL 1.87-1.96 (2 measured).

References

• Emery, C. 1925. Hymenoptera. Fam. Formicidae. Subfam. Formicinae. Genera Insectorum 183: 1-302
• Forel, A. 1908. Fourmis de Ceylan et d'Égypte récoltées par le Prof. E. Bugnion. Lasius carniolicus. Fourmis de Kerguelen. Pseudandrie? Strongylognathus testaceus. Bull. Soc. Vaudoise Sci. Nat. 44: 1-22. PDF
• Kohout, R.J. 2008a. A review of the Polyrhachis ants of Sulawesi with keys and descriptions of new species (Hymenoptera: Formicidae: Formicinae). Memoirs of the Queensland Museum. 52:255-317.
• 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.

References based on Global Ant Biodiversity Informatics

• Chapman, J. W., and Capco, S. R. 1951. Check list of the ants (Hymenoptera: Formicidae) of Asia. Monogr. Inst. Sci. Technol. Manila 1: 1-327
• Forel A. 1909. Études myrmécologiques en 1909. Fourmis de Barbarie et de Ceylan. Nidification des Polyrhachis. Bull. Soc. Vaudoise Sci. Nat. 45: 369-407.
• Forel A. 1911. Ameisen aus Ceylon, gesammelt von Prof. K. Escherich (einige von Prof. E. Bugnion). Pp. 215-228 in: Escherich, K. Termitenleben auf Ceylon. Jena: Gustav Fischer, xxxii + 262 pp.
• Forel, A. 1908. Fourmis de Ceylan et d'Égypte récoltées par le Prof. E. Bugnion. Lasius carniolicus. Fourmis de Kerguelen. Pseudandrie? Strongylognathus testaceus. Bull. Soc. Vaudoise Sci. Nat. 44: 1-22
• Gumawardene, N.R., J.D. Majer and J.P. Edirisinghe. 2008. Diversity and richness of ant species in a lowland wet forest reserve in Sri Lanka. Asian Myrmecology 2:71-83
• Gunawardene N. R., J. D. Majer, and J. P. Edirisinghe. 2008. Diversity and richness of ant species in a lowland wet forest reserve in Sri Lanka. Asian Myrmecology 2: 71-83.
• 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(3): 137-171.