Simopone conradti Emery

Bolton, Barry & Fisher, Brian L., 2012, Taxonomy of the cerapachyine ant genera Simopone Forel, Vicinopone gen. n. and Tanipone gen. n. (Hymenoptera: Formicidae) 3283, Zootaxa 3283 (1), pp. 1-101 : 22-24

Simopone conradti Emery

( Figs 7–9 )

Simopone conradti Emery, 1899a: 475 . Holotype worker, CAMEROUN: Lolodorf, iii.95 (L. Conradt) (MSNG) [examined] (see note).

NOTE. In the MSNG collection are two specimens of conradti collected by Conradt in Cameroun; both are labelled “typus”. But at the end of the original description Emery (1899a) states that his examined material is “un exemplaire”, so obviously one of these is the holotype and the other has no type status. Both specimens match the original description except for size, which Emery gives as “5½ mill.” By direct measurement the total length of one specimen is 6.6, the other 8.2; the smaller specimen is recognised here as the holotype.

WORKER. HL 1.28–1.80, HW 0.78–1.10, SL 0.34–0.48, EL 0.34–0.50, PW 0.59–0.84, AIIW 0.57–0.84, AIIL 0.63–0.89, AIIIW 0.66–1.03, AIIIL 0.78–1.08, WL 1.46–2.00, MFL 0.64–1.00, CI 59–62, SI 42–46, EL/HW 0.44– 0.46, EP 0.85–0.95, AIIW/AIIL 0.90–0.98, AIIIW/AIIIL 0.85–0.97 (9 measured).

Clypeus strongly reflexed so that the clypeo-labral junction is conspicuously below and far behind the anteriormost point of the apparent anterior margin; the latter with a projecting rounded to bluntly triangular median tooth or prominence, the margin not transverse, not evenly convex. Frontal carinae extend back to the level of the anterior margins of the eyes. Eyes located just in front of the cephalic midlength, EP <1.00; in full-face view outer margins of eyes do not interrupt the outlines of the sides. Scape flattened apically but not extremely broad, SW/SL 0.50–0.57. Leading edge of scape with 1–3 very short inconspicuous setae present. Sides of head below and behind eyes without projecting setae; cephalic dorsum with a single pair of standing setae, at about level of midlength of eye. Cephalic dorsum with dense superficial microreticulate ground sculpture, upon which are scattered punctures; between the eyes also with very fine, dense, longitudinal striolae or costulae that tend to diminish or fade out posteriorly. In dorsal view pronotum with a conspicuous anterior carina; humeri not sharply angulate; promesonotal suture with small cuticular ribs. Metanotal groove vestigial to absent. Propodeum with a very weak ridge between dorsum and declivity, which continues down the sides of the declivity. Entire dorsum of mesosoma with sculpture similar to that on the head, but the longitudinal fine costulate component best developed on the pronotum and tending to fade out posteriorly; on the propodeum it may even be absent. Sides of mesosoma microreticulate. Dorsum of mesosoma with a single pair of setae, located at the pronotal humeri. AII (petiole) with a mere angle or extremely weak transverse ridge between anterior and dorsal surfaces. Posteriorly AII without trace of a carina; instead the dorsum of the tergite forms an uninterrupted curve down to the posterior foramen. At least the median third of AII dorsally with distinct longitudinal costulate sculpture. In dorsal view the sides of AII terminate in acute posterior angles, which in some (but not all) specimens are slightly produced posterolaterally at their apices. Anteroventral process of AII a short cuticular flange with an acute, dentiform apex. Dorsum of AIII marginate laterally for at least the anterior quarter of the length, mid-dorsally with distinct longitudinal costulae at least on the median third, this sculpture contrasting strongly with the dorsum of AIV, which is extremely densely microreticulate to reticulate punctate and with numerous small pits. Tergites of AII and AIII in dorsal view longer than broad, AIV distinctly broader than long; maximum width of AIV 0.84–1.26, maximum length 0.70–1.00. Abdominal tergites AII to AV without setae of any form, but pubescence is distinct on AIII–AV. Setae absent from shafts of femora and tibiae of middle and hind legs but one or two minute setae may occur at their extreme apices. Pygidial fork stout, the pygidial margins on each side with a row of 6–10 spiniform denticles. Full adult colour of head and body black; on the head the scapes dull yellow and contrasting strongly with the head capsule.

QUEEN (dealate gyne; not previously described). HL 1.52–1.76, HW 0.94–1.16, SL 0.38–0.52, EL 0.38–0.48, PW 0.74–0.91, AIIW 0.69–0.89, AIIL 0.74–0.91, AIIIW 0.82–1.02, AIIIL 0.96–1.17, AIVW 1.01–1.27, AIVL 0.84–1.04, WL 2.14, MFL 0.82–1.04, CI 62–66, SI 40–45, SW/SL 0.52–0.57, EL/HW 0.40–0.42, EP 0.90–0.93, AIIW/AIIL 0.93–0.98, AIIIW/AIIIL 0.85–0.87 (2 measured).

Matching the description and general shape of the worker but the mesosoma with a full complement of flight sclerites.

The presence of a median clypeal prominence, coupled with the very distinctive sculpture on the tergites of AII–AIV, laterally marginate anterior portion of AIII and almost complete lack of dorsal setae, make conradti immediately recognisable.

Material examined. Ivory Coast: Lamto, Toumodi, For. de Plateau, 1974 (W. Gotwald). Nigeria: Ibadan, and Ibadan IITA, 1987 (J. Noyes). Cameroun: no loc. (L. Conradt); Lolodorf (L. Conradt) Gabon: Prov. Ogoové-Maritime, Rés. des Monts Doudou, NW Doussala, 2000 ( S. van Noort ). Central African Republic: P.N. Dzanga- Ndoki, Mabéa Bai, NE Bayanga, 2001 (B.L. Fisher). Democratic Republic of Congo: Kinshasa, 1985 (A. Dejean). Uganda: Kibale Nat. Park, Kanyawara, Makerere Univ. Biol. Field Station ( S. van Noort ). Kenya: Kakamega Forest, Busumbuli, 2002 (W. Freund).

Figures

FIGURES 7–9. Lateral, full face and dorsal view of body. Simopone conradti worker CASENT0178214.