Question

what are the chief characters of crustaceans​

Answer 1

Answer:

Crabs and crayfish are crustaceans, a subdivision of arthropods – the large group of animals without backbones (invertebrates) that includes insects, spiders, mites, scorpions and springtails. Arthropods have jointed legs and a hard outer shell that acts as a skeleton.

A crustacean has the following features:

1.a segmented body with a hard exterior (known as an exoskeleton)

2.jointed limbs, each often with two branches (termed biramous)

3.two pairs of antennae

4.gills

5.seven or more pairs of appendages for feeding, swimming, walking, respiration and reproduction (clasping, sperm transfer, egg brooding and carrying young).