Chaceon crosnieri

Chaceon crosnieri is a species of crab.

Chaceon crosnieri differs from C. affinis in that the carapace is more inflated, the outer orbital and the suborbital teeth are stronger, the subdistal tooth on the merus of the cheliped is stronger and the cheliped is smoother dorsally; the carpus of the walking legs lacks dorsal spinules, and the merus of the walking legs has a strong distal dorsal spine. It differs from C. chuni in being much larger up to 155 millimetres (6.1 in), the carapace is more inflated, the gap between the first and second anterolateral tooth of the carapace is larger; the frontal teeth of the carapace are stronger, the suborbital spine is smaller, and the carpus of the cheliped lacks an outer spine. Chaceon crosnieri is a smoother species than C. bicolor, with shorter and stouter legs, the suborbital spine is lower and blunter, and the distal projection on the merus of the walking legs is much less developed in larger specimens.

This species is named after Alain Crosnier (1930-2021).