Polyrhachis rastellata

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Polyrhachis rastellata
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Camponotini
Genus: Polyrhachis
Subgenus: Cyrtomyrma
Species: P. rastellata
Binomial name
Polyrhachis rastellata
(Latreille, 1802)

Polyrhachis rastellata casent0903407 p 1 high.jpg

Polyrhachis rastellata casent0903407 d 1 high.jpg

Specimen Labels

Subspecies
Synonyms

The identity and distribution of this species has not been firmly established (see below) hence little can be inferred from any records about Polyrhachis rastellata biology.

Photo Gallery

  • Polyrhachis rastellata worker from Kerala, India. Photo by Kalesh Sadasivan.
  • Alate queen from Mysuru, Karnataka, India. Photo by Pavan Ramachandra.

Identification

Polyrhachis rastellata resembles Polyrhachis lepida. Polyrhachis lepida is generally smaller, with a distinctly more convex occiput and longer antennal scapes (SI 128-136 versus 111-123 in Polyrhachis rastellata). The petiolar spines differ, with the lateral pair in Polyrhachis lepida distinctly longer than the dorsal pair. In contrast, the petiolar spines in Polyrhachis rastellata are subequal or the lateral pair is somewhat shorter than the dorsal pair. The two species also differ in the colour of their legs with those of Polyrhachis lepida consistently darker. (Modified from Kohout 2006).

Keys including this Species

Distribution

In the literature, Polyrhachis rastellata has been reported to occur over most of south-east Asia and south across Indonesia and New Guinea to northern Australia. However, many of these records are linked to the numerous infraspecies connected to that name. Several authors, including Mayr (1872: 138) and Wheeler (1919: 136) listed Polyrhachis rastellata from Borneo and various authors have listed it from New Guinea. Consequently, I have included it in the lists and keys of species from both regions. However, I have not seen any Bornean or New Guinean material satisfactorily comparable with the specimens from India that Donisthorpe considered to be Polyrhachis rastellata and I believe that the nominal form is restricted to India, Sri Lanka, Myanmar and former Indochina, including Sumatra and possibly Java. (Kohout 2006)

Latitudinal Distribution Pattern

Latitudinal Range: 20.92583° to -21.14121°.

 
North
Temperate
North
Subtropical
Tropical South
Subtropical
South
Temperate

Distribution based on Regional Taxon Lists

Indo-Australian Region: Borneo, Indonesia (type locality), Malaysia, New Guinea, Philippines.
Oriental Region: India, Nepal, Sri Lanka, Thailand.
Palaearctic Region: China.

Distribution based on AntMaps

AntMapLegend.png

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.
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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.
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Biology

Association with Other Organisms

Explore-icon.png Explore: Show all Associate data or Search these data. See also a list of all data tables or learn how data is managed.
  • This species is a host for the fungus Ophiocordyceps formicarum (a parasitoid) (Quevillon, 2018) (encounter mode primary; direct transmission; transmission outside nest).
  • This species is a host for the fungus Ophiocordyceps unilateralis (a parasitoid) (Quevillon, 2018) (encounter mode primary; direct transmission; transmission outside nest).

Castes

Worker

Images from AntWeb

Polyrhachis rastellata casent0906784 h 1 high.jpgPolyrhachis rastellata casent0906784 p 1 high.jpgPolyrhachis rastellata casent0906784 d 1 high.jpgPolyrhachis rastellata casent0906784 l 1 high.jpg
Worker. Specimen code casent0906784. Photographer Michele Esposito, uploaded by California Academy of Sciences. Owned by NHMUK, London, UK.

Nomenclature

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

  • rastellata. Formica rastellata Latreille, 1802c: 130 (q.) INDONESIA ("Indes orientales"). Mayr, 1862: 688 (w.); Mayr, 1876: 70 (m.); Crozier, 1970: 115 (k.); Wheeler, G.C. & Wheeler, J. 1990b: 756 (l.). Combination in Polyrhachis: Smith, F. 1858b: 59; in P. (Cyrtomyrma): Forel, 1915b: 107. Senior synonym of ceylonensis Donisthorpe: Dorow, 1995: 24. See also: Kohout, 2006b: 114. Current subspecies: nominal plus congener.
  • ceylonensis. Polyrhachis (Cyrtomyrma) rastellata var. ceylonensis Donisthorpe, 1938c: 256 (w.) SRI LANKA. [Unresolved junior primary homonym of ceylonensis Emery, above.] Junior synonym of rastellata: Dorow, 1995: 24.

Type Material

  • Formica rastellata: Holotype, queen, Indonesia.

Taxonomic Notes

The identity and range of Polyrhachis rastellata is somewhat muddled. Kohout (2006) explains: "During the past two centuries more than twenty infraspecific names have been connected to this name. My current interpretation of this species is based upon specimens from India that Donisthorpe considered to be Polyrhachis rastellata [‘Described from an Indian specimen (Wroughton)’ (Donisthorpe, 1938)]. However, the type locality of Polyrhachis rastellata is the ‘Indes orientales’ or the East Indies, and probably corresponds to modern day Malaysia and Indonesia. Consequently, interpreting Polyrhachis rastellata based on Indian material may well be incorrect. It would be highly desirable to establish the nomenclatural stability of this species by the designation of a neotype. However, I believe that such an action would not be appropriate here, as I have not attempted a revision of the Asian fauna of the subgenus."

From Kohout (2006): The holotype queen of Polyrhachis rastellata was apparently lost “a long time ago” (J. Casevitz Weulersse, Musee National d'Histoire Naturelle, pers. comm.). The type locality, given as the East Indies ("Indes Orientales"), probably corresponds to modern Malaysia and Indonesia.

Description

Karyotype

  • n = 21, 2n = 42, karyotype = 8M+34SM (Malaysia) (Crozier, 1970b; Imai et al., 1983).

References

References based on Global Ant Biodiversity Informatics

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