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Centromyrmex arnoldi SantschiHNS, 1919: 229, figs. a-d. Syntype workers and males, MOZAMBIQUE: Amatongas Forest, ix.1917 (G Arnold) (NHMB) [examined]. [Variety of constanciaeHNS by Santschi, 1920: 8. Synonymy with constanciaeHNS by Arnold, 1926: 199 (in text).] Syn. n.
Centromyrmex arnoldi r. guineensis BernardHNS, 1953: 186, fig. 1d. Holotype worker, GUINEA: Mt Nimba, Nion, St.22, 700 m., 15.iv.1942 (Lamotte) (MNHN) [examined]. Syn. n. [Subspecies of constanciaeHNS by Bolton, 1995: 140.]
1 The unique holotype of sellarisHNS was discovered by Dr Hege Vardal in the NHRS collection, still preserved in alcohol after 117 years. The specimen was accompanied by three labels, two of which merely stated "Camerun" and "Sjostedt" respectively. A larger and more informative label carried the information "Riksmuseets Entomologiska Afdelning. Centromyrmex sellaris MayrHNS n. sp. Typ. Kamerun, 1891. Colleg. Y. Sjostedt". The holotype has now been mounted upon a standard card point.
2 Although the holotype of congolensisHNS appears to have been lost, it is possible that it may still be present but unrecognised in Weber's material, either at AMNH or MCZC. Fortunately, the original description and figures are sufficient to allow identification of the taxon. For these reasons, and because the name is a junior synonym, a neotype has not been designated.
WORKER. TL 4.8-6.1, HL 0.84-0.98, HW 0.90-1.13, CI 108-118, ML 0.58-0.72, MI 68-75, SL 0.64- 0.76, SI 67-73, PW 0.74-0.92, WL 1.54-1.80 (15 measured).
With characters of the genus and the feaeHNS group. Head capsule in full-face view always appears obviously broader than long, CI 108 or usually more. Mandibles smooth with scattered small punctures. Masticatory margin of mandible with 7-10 small, low blunt teeth that are usually broadly low-triangular but are often reduced to mere crenulations when worn. Basal tooth at basal angle of mandible and usually obvious, only rarely reduced and insignificant. Distal of the basal tooth there is usually a diastema before the next tooth on one or both of the mandibles, but sometimes this is not apparent as a denticle may be present within the diastema on one, or less often both, of the mandibles. Dorsum and sides of head with scattered punctures on smooth cuticle, and also with weak striation within the antennal fossae and on the sides, especially anteriorly. Extent of the striate component is variable. Metatibia with only normal setae dorsally but its anterior surface, at the apex and approximately opposite the pectinate spur, with 2 (3 in a single specimen) much stouter and usually more darkly coloured spiniform setae. Petiole node in dorsal view broader than long. Pronotal dorsum, and anterior mesonotum, with widely scattered broad, shallow punctures that may be almost effaced. Pronotum dorsally also with variable weak oblique or arched faint disorganised sculpture. Colour yellow to light brown.
QUEEN. TL 6.9, HL 1.01, HW 1.12, CI 111, OI 32, ML 0.70, MI 69, SL 0.80, SI 71, PW 1.11, WL 2.00. The queen of this species should run out correctly in the key to workers but care should be taken as the queens of longiventrisHNS and ereptorHNS remain unknown. The form of the mandible described above for the worker is reproduced in the queen caste.
MALE. Known; see under diagnosis of genus.
This species and angolensisHNS are the most widely distributed and most commonly encountered species of the feaeHNS group in Africa. Superficially the two look very similar, but angolensisHNS always has a longer, narrower head and only ever has a single stout spiniform seta at the apex of the anterior surface of the metatibia, about opposite the pectinate spur. In addition, the basal mandibular tooth in angolensisHNS is generally absent, sometimes vestigially present, but there is never the basal tooth + diastema arrangement that is characteristic of sellaris.HNS Care should be taken with this character because of variation in development in sellarisHNS but it is usually a good indicator of the species.
FIGURES 25-32. Full face and lateral view of body. Figs 25-26: Centromyrmex sellarisHNS worker CASENT0066705; Figs 27-28: Feroponera feroxHNS paratype worker CASENT0102994; Figs 29-30: Promyopias silvestriiHNS worker CASENT0178751; Figs 31-32: Promyopias silvestriiHNS queen CASENT0178752.
From data labels on specimens this species has been discovered in termitaries of the genus Odontotermes, but the true range of termite prey is undoubtedly much greater.
Material examined. Guinea: Mt Nimba, Nion (Lamotte). Ivory Coast: Lamto, Toumodi (J. Levieux); Lamto (K. Yeo); Oume, nr Goulikao (S. Katia); For. de Teke, Anyama (T. Diomande). Ghana: Tafo (D. Leston); Bunso (D. Leston); Kwadaso (J. Plisko). Nigeria: Gambari (B. Bolton); Gambari, CRIN (B. Taylor). Cameroun: no loc. (Y. Sjostedt). Gabon: Prov. Woleu-Ntem, ESE Minvoul (B.L. Fisher). Democratic Republic of Congo: Mulungu (F.L. Hendricks); SW Pweto (Ross & Leech). Uganda: Iganga (A. Abera); SW Gulu (Ross & Leech); no loc. (R.H. Le Pelley). Kenya: Western Prov., Kakamega Forest, Shinyalu (F Hita Garcia). Mozambique: Amatongas Forest (G. Arnold). Zambia: Lusaka, Leopard Hill (B.L. Fisher). Zimbabwe: Bembesi (G Arnold); Bulawayo (G Arnold); Lonely Mines (H. Swale).
Found most commonly in these habitats: 9 times found in rainforest, 3 times found in miombo woodland, 1 times found in mature swamp forest, 1 times found in forest edge, 1 times found in primary forest, 1 times found in Primary forest, selectively logged 60 years previously.
Found most commonly in these microhabitats: 10 times ex soil, 1 times in soil, 2 times ex rotten log, 1 times In rotting log with termites, 1 times ex termite mound.
Collected most commonly using these methods: 1 times search, 2 times Hand collected.
Elevations: collected from 248 - 1300 meters, 669 meters average