| Outer appearance of a crayfish: lower side, male |
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With labels
Legend:
1 cephalothorax
2 abdomen
3 antenna
4 antennulae
5 mouthparts
6 branchiostegite
7 cheliped (claw)
8 pereiopods (legs)
9 pleopod 1 (modified for sperm transfer)
10 sternite
11 pleopods 2-5 (flippers)
12 pleopod 6 / uropod
13 anus
14 telson
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English name: Crayfish
Scientific name: Astacus sp.
Familia: Astacidae
Classis: Malacostraca
Phylum: Arthropoda (subphyllum Crustacea)
Regnum: Animalia
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| 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. |