Camponotus nigroaeneus xuthus

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Camponotus nigroaeneus xuthus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Camponotini
Genus: Camponotus
Species: C. nigroaeneus
Subspecies: C. nigroaeneus xuthus
Trinomial name
Camponotus nigroaeneus xuthus
Emery, 1925

Camponotus xuthus casent0910393 p 1 high.jpg

Camponotus xuthus casent0910393 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of Camponotus nigroaeneus xuthus.

Identification

McArthur (2009) - The integument of the gaster in C. xuthus in not hidden by pubescence and the ant is brown whereas Camponotus nigroaeneus has distinct short whitish decumbent setae (pubescence) which hide the gaster and is mostly black.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Australasian Region: Australia (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.

  • xuthus. Camponotus (Myrmophyma) nigroaeneus subsp. xuthus Emery, 1925b: 111 (s.w.) AUSTRALIA.
    • [First available use of Camponotus (Myrmoturba) nigroaeneus r. divus var. xuthus Forel, 1915b: 97 (s.w.) AUSTRALIA (Western Australia); unavailable (infrasubspecific) name.]
    • Status as species: McArthur, 2009: 285 (redescription).
    • Subspecies of nigroaeneus: Bolton, 1995b: 130; McArthur, 2014: 90.

Type Material

  • Camponotus (Myrmophyma) nigroaeneus xuthus Emery, 1925: Syntype, 1 major and 1 minor worker, Kimberley District, Western Australia, Australia, Musee d'Histoire Naturelle Genève.

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

Description

Worker

Worker. Length 6.7 to 8.5 mm.

Worker major (for the form divus only the minor worker is described). Larger than the type and much less pubescent, also less glossy, with somewhat coarser sculpture and less erect pilosity. Node much thinner especially above. The head has convex sides and is less narrowing in front, less trapezoidal. The antennae funiculus is red (black with the type) and brown legs.

Worker minor. Different from r.divus by its much thinner node, which is definitely bluntly rounded, but without a flat surface above, while divus has a less convex and very long surface above, which is as long as the base of the node and the anterior height. Above all the hairs on the tibias are sharp, half upstanding, while those if divus are quite flat lying. The thorax is less convex and the metanotum (= propodeum) has a somewhat longer declivity. But the head is in fact somewhat broader and shorter then with divus and behind is as narrow as in front, while with the type it is trapezoidal, broader behind than in front. The head has in addition an almost straight posterior border, while with divus as well as the type it is convex. The pubescence is much weaker than divus and much weaker than the type, the body length somewhat greater than divus.

McArthur (2009) - Major. Head sides anterior two thirds straight and parallel, posterior third convex tapering anteriorly. Vertex mostly flat in front view and swollen in lateral view. Clypeus anterior margin median section strongly concave and bounded by two teeth. Propodeal dorsum straight, propodeal angle gently convex, about 135°. PD / D ~ 12.5. Petiolar node summit blunt in side view. Mesosoma in profile dorsum with about 30 fairly evenly spaced long erect setae. Underside of head and genae with plentiful erect long setae; scape and tibiae with plentiful short decumbent setae raised to < 20°. Colour: mostly reddish brown.

Minor. Finely punctate. Head sides straight and near parallel. Vertex mostly convex. Clypeus anterior margin projecting strongly and bounded by 90° corners. Propodeal dorsum feebly convex about 150°. PD / D ~ 3. Petiolar node summit blunt in side view. Mesosoma in profile dorsum with about 20 fairly evenly spaced long erect setae. Underside of head and genae with plentiful erect short setae; scape and tibiae with plentiful short setae raised to > 20°. Colour: mostly reddish brown.

Syntype major worker, HW 2.5, HL 2.7, PW 1.0, FCW 1.0, HT 0.8, TL 2.0; syntype minor worker, HW 1.5, HL 1.8, PW 1.90, FCW 0.70, HT 1.1, TL 1.8.

References