Très belles photos, content de voir que tu réussis avec cette espèce!
Pour les différences avec S. casuarius, le patron de coloration en effet, la taille, l'aspect un peu moins rhéophile, la forme de la tête, l'origine géographique...
De plus, d'après cette étude, à l'intérieur du genre
Steatocranus, les deux espèces ne font pas partie du même groupe (il y en a 3) :
http://www.plosone.org/article/info%3Ad ... ne.0022380
Un extrait : "
Steatocranus splits into three major monophyletic groups. One is composed of the lower Congo endemics S. casuarius and S. sp. aff. casuarius “brown pearl”,
Steatocranus sp. “Maluku” from upstream of Pool Malebo, S. sp. “dwarf” and species from the northern tributaries Ubangi and Ngoko and from the upper Congo near Kisangani (S. sp. “Kisangani”, S. ubanguiensis, S. sp. “Nki” and based on the mt- tree also S. sp. “Lefini”, Fig. 2).
Steatocranus sp. “Maluku” appears as sistergroup to the S. cf. casuarius clade (BS = 64) in the nc- but to S. sp. “dwarf” in the mt- dataset (BS = 96). The second major group is composed of the lower Congo endemics S. cf. gibbiceps, S.
mpozoensis, S. glaber and four distinct S. cf. tinanti clades (BS = 100 in the nc and BS = 91 in the mt-dataset, Fig. 2). The relationship of S. glaber is ambiguous as it is sister to S.
mpozoensis in the mt- dataset (BS = 95) but to S. gibbiceps in the AFLP dataset (BS = 90).
Steatocranus species occurring outside of the Lower Congo roughly form two phylogenetic clusters according to their major geographic distribution either north (“North” clade, Congo mainstream/Ubanghi/Sangha/Lefini) or south (“South” clade, Kasai/Kwango and Pool Malebo) to the Congo mainstream. The third major group, composed of species from the southern Congo tributaries and from the Congo mainstream (S. rouxi, S. sp. “red eye”, S. sp. “bulky head”, and S. bleheri), appears polyphyletic in all datasets."
Il y a aussi des photos de profil des différentes espèces à l'appui de cet arbre :
http://www.plosone.org/article/fetchObj ... tion=PNG_M
