There are 23 species of crocodilian currently recognised. However, evidence suggests that the three currently recognised species from Africa warrant being split into 7 species [ie Crocodylus niloticus to C. suchus and C. niloticus; Osteolaemus tetraspis to O. tetraspis, O. osborni and O. sp. nov.); and, Mecistops cataphractus to Mecistops sp. (Central Africa) and Mecistops sp. (West Africa); Eaton 2010; Hekkala et al. 2011; Shirley et al. 2013]. Note: although Crocodylus cataphractus is now generally acknowledged as Mecistops cataphractus, the latter is not formally accepted by IUCN and CITES, and so the former name is used here.
Descriptions for each of the 23 species are provided as pdf documents below.
Eaton, M.J. (2010). Dwarf Crocodile Osteolaemus tetraspis. Pp. 127-132 in Crocodiles. Status Survey and Conservation Action Plan. Third Edition. Crocodile Specialist Group: Darwin.
Hekkala, E., Shirley, M.H., Amato, G., Austin, J.D., Charter, S., Thorbjarnarson, J., Vliet, K.A., Houck, M.L., Desalle, R. and Blum, M.J. (2011). An ancient icon reveals new mysteries: mummy DNA resurrects a cryptic species within the Nile crocodile. Molecular Ecology (doi: 10.1111/j.1365-294X.2011.05245.x).
Shirley, M.H., Vliet, K.A., Carr, A.N. and Austin, J.D. (2013). Rigorous approaches to species delimitation have significant implications for African crocodile systematics and conservation. Proceedings of the Royal Society B: Biological Sciences 281(1776): 20132483.