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Outer appearance of a crayfish: lower side, male

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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

English name: Crayfish
Scientific name: Astacus sp.
Familia: Astacidae
Classis: Malacostraca
Phylum: Arthropoda (subphyllum Crustacea)
Regnum: Animalia
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.

last modified: 5 Jun 2014