There are 24 species of crocodilian currently recognised (West African Nile crocodile C. suchus being the most recent addition: Hekkala et al. 2011; Shirley et al. 2013). However, evidence suggests that two species from West Africa warrant being split into 5 species: 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; Shirley et al. 2013]. Although Crocodylus cataphractus is now generally acknowledged as Mecistops cataphractus, the latter name is not formally accepted by the IUCN and CITES.
Descriptions for each of the 24 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.