Centromyrmex longiventris Santschi , Bolton, B. & Fisher, B. L., 2008

Bolton, B. & Fisher, B. L., 2008, Afrotropical ants of the ponerine genera Centromyrmex Mayr, Promyopias Santschi gen. rev. and Feroponera gen. n., with a revised key to genera of African Ponerinae (Hymenoptera: Formicidae)., Zootaxa 1929, pp. 1-37: 19-21

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Centromyrmex longiventris Santschi

stat. n.

Centromyrmex longiventris Santschi  HNS  stat. n.

(Figs 17-18)

Centromyrmex sellaris var. longiventris Santschi  HNS  , 1919: 229. Syntype worker, CAMEROUN: Victoria (Silvestri) ( NHMB) [examined]. Stat. n.

WORKER. TL 3.5-3.6, HL 0.65-0.67, HW 0.65-0.68, CI 98-101, ML 0.38-0.40, MI 59-64, SL 0.48- 0.50, SI 73-74, PW 0.50-0.56, WL 1.06-1.14 (4 measured).

With characters of the genus and the feae  HNS  group. Head capsule in full-face view usually appears about as long as broad, CI 101 or less. Mandibles smooth with scattered small punctures. Masticatory margin of mandible with 7-10 small, low indistinct teeth, reduced to mere crenulations or even more or less smooth when worn. Basal angle of mandible rounded, usually with a very small basal tooth visible but sometimes indistinct or vestigial, or with a slightly accentuated basal angle. Dorsum of head with scattered punctures on smooth cuticle; on sides of head the punctures denser than on dorsum, and also with weak striation within the antennal fossae and on the sides, especially anteriorly. Metatibia with only normal setae dorsally but its anterior surface, at the apex and approximately opposite the pectinate spur, with two much stouter and sometimes more darkly coloured spiniform seta whose bases are close together. With mesosoma in profile the dorsal outline of the propodeum is abruptly angled downward from the mesonotum, so that its anterior portion forms a steep slope. Petiole node in dorsal view broader than long. Pronotal dorsum, and anterior mesonotum, with a few widely scattered broad, shallow punctures that may be almost effaced. Pronotum dorsally also usually with variable weak oblique or arched faint disorganised sculpture; almost effaced in some specimens. Colour yellow to light brownish yellow.

QUEEN and MALE: unknown.

C. longiventris  HNS  is closely related to ereptor  HNS  . Both species superficially resemble small specimens of angolensis  HNS  , but are easily separated as they have two spiniform setae at the anterior apex of the metatibia, where only one is present in angolensis  HNS  . C. longiventris  HNS  and ereptor  HNS  are best distinguished by size and the shape of the anterior propodeum in profile. The former is smaller and the anterior portion of the propodeum forms a steep slope immediately behind the mesonotum, whereas the latter is larger and the anterior propodeum is only shallowly and gradually sloped from the mesonotum. Only four specimens of this small species are known.

The name longiventris  HNS  itself is misleading as the gaster here is proportionately no longer than in any other member of the group, but in the syntype examined the gaster is distended, probably from initial storage in alcohol that was too dilute.

Material examined. Cameroun: Victoria (F Silvestri); Res. Dja (K. Yeo). Gabon: Plateau d'Ipassa (J.A. Barra).


Switzerland, Basel, Naturhistorisches Museum