Calosoma (Ctenosta) guineense Imhoff, 1843

Length 22-26 mm. Both sexes have unmistakable characteristics that allow easily to distinguish them from the other species of the subgenus: tarsi with red gold hair on the underside, protibiae with apical ends dilated, and in the males with a series of indentations on the external side. These characteristics led Jeannel (1940) towards the creation of the subgenre Paractenosta. The species is easily recognizable even to a cursory examination for the elytral sculpture with intervals of the same width and heigth ("omodyname" sculpture), smooth and only slightly raised, and for the bronze-purple color of the upper body.
It is present in West Africa: Côte d'Ivoire, Togo, Nigeria, Congo.

Examined specimens and literature’s data
Burkina Fasu. (SB ex coll. M. Tingaud) Central African Republic. Bangui, foret de Bimbo (EM, SB); Boukoko (TL)
Côte d'Ivoire. Dimbroko (Jeannel, 1940:131), Comoe (SB), Lamto (SB)
Democratic Republic of the Congo. Kolwezi (EM, SB), Medje (Breuning, 1927: 160), Kassai (Jeannel, 1940: 131); Kinshasa (Museum of Nature and Human Activities, Hyogo Pref., Japan, gbif.org); Ituri: Bunia 1250m (www.inaturalist.org), Kivu: Beni (SB); territoire de Sassa (type of C. Colmanti, MRCA)
Gabon. (seen on the market in Modena in 2015)
Ghana. Akuapim dist. (type of Calosoma guineense MNHN)
Nigeria. Ibadan (Breuning, 1927: 160)
Togo. (Breuning 1927: 160); Kouma Konda (SB)

Notes: Winged. Active individuals were found just before the beginnig of the raining season, in March and April, as well as after its ending, in October and November.

Calosoma (Ctenosta) guineense ♂ Imhoff, 1843 Cote d'Ivoire: Comoe, IV.98

Calosoma (Ctenosta) guineense ♀ Imhoff, 1843 Cote d'Ivoire: Lamto, 5°02'W 6°13'N, 15.III.86, Rasplus lgt.