Back to Medium sized version | With labels
Outer appearance of a crayfish: lower side, male
7 cheliped (claw)
8 pereiopods (legs)
9 pleopod 1 (modified for sperm transfer)
11 pleopods 2-5 (flippers)
12 pleopod 6 / uropod
English name: Crayfish
Scientific name: Astacus sp.
Phylum: Arthropoda (subphyllum Crustacea)
Male and female crayfish can be distinguished from each other from the lower side view. In females the first pleopod pair is absent or very much reduced, whereas in males the first pleopod pair has been modified for sperm transfer. This male only has one of its first pleopods left.