Calosoma (Ctenosta) scabrosum Chaudoir, 1843

Calosoma scabrosum Chaudoir, 1843: 745 (described from: Kordofan); lectotype ♂ (no locality label) designated by Deuve (1978: 250) in Muséum National d'Histoire Naturelle, Paris [examined]
Calosoma kordofanum (Kollar) Chaudoir, 1852: 100 (nomen nudum)
Calosoma (Ctenosta) scabrosum Breuning, 1927: 185
Ctenosta scabrosum Jeannel, 1940: 128
Calosoma jakli Häckel e Al., 2005: 2 (type locality: Oman, Dhofar); holotype ♂ in coll. Häckel, Prague; synonymy later established by Häckel e Al., 2010: 12

Length 17-26 mm. C. roeschkei, C. orientale and C. scabrosum form a fairly homogeneous group of species characterized by elytral sculpture with intervals of the same width and height ("homodynamic" type), deeply incised transversely. C. scabrosum is distinguishable because of the black color of the upper side of the body with only weak bronze reflexes, the more elongated body shape, the the slightly angular pronotum clearly narrower behind with arcuate sides.
C. scabrosum var. roeschkei described by Breuning (1927: 185) from Usumbara in Tanzania, as already suspected by the same author, should actually refer to a distinct species, later described again by Jeannel (1940: 127) as C. aethiops.
According to Jeannel (1940: 128), C. scabrosum from Central and Eastern Sahara (Niger, Chad, Sudan), arrives to the east at the Red Sea (Djibouti, Somalia). Moreover, it is known from Nigeria, Ethiopia (Breuning, 1928b: 96), Yemen (Häckel, 2012: 55), and Oman (Häckel e Al., 2005 and 2010).

Examined specimens and literature’s data
Chad. distr. Kanem, N’Gouri (sub chlorostictum), Fort Lamy (RMCA), Nguigmi (Jeannel, 1940: 128), Ennedi Central (Vigna Taglianti & Bruschi, 1988: 243), Ennedi Ouest: Aloba mountain (Gillet, 1959: 518).
Djibouti. Obock (NMP, RMCA), Holhol (
Ethiopia. Welo Prov. Yangudi Rassa National Park (PS); Addis Ababa (Breuning, 1928b: 96)
Yemen. NW Al Mukhalla (Häckel, 2012: 55)
Niger. Aïr, Azel (RMCA); Agades (Jeannel, 1940: 128); entre Arlit et Agadès (
Nigeria. Massif du Kapya (SB), Budan (AVT)
Oman. Dhofar prov: Jabal Sanhán (SB), Wadi Nashib (EM, SB), Salalah,Wadi Darbat (coll I. Zappi); Takwa env., Mughsayi, (Häckel et al, 2016: 14)
Somalia. Berbarah (BMNH; Vigna Taglianti & Bruschi, 1988: 243)
Sudan. Kordofan (type MNHN)(BMNH, RMCA); Southern Kordofan, Kaduqli (SB); Red Sea Province: 175 km SE of Atbara (SB), 190 km E of Atbara. Khor Adarot (SB)

Notes: Winged. The specimens examined were captured in August-September up to October during the peak of the rainy season

Calosoma (Ctenosta) scabrosum
Chaudoir, 1843
Nigeria: Massif du Kapya, 5 aout 1949
Calosoma (Ctenosta) scabrosum
Chaudoir, 1843
Nigeria, Budan, 8.9.88, Rougemont leg. (coll. Vigna Taglianti)

updated February 20 2021