Question

What are the chief characters of the crustaceans?​

Answer 1

Some Characteristics of Crustaceans:

• A hard exoskeleton made of calcium - no internal skeleton.
• The head has two compound eyes, two pairs of antennae, and three pairs of mouthparts.
• A pair of green glands excrete wastes near the base of antennae.
• The abdominal segments have swimmerets (swimming legs)
• The sexes are separate. Eggs are attached to the swimmerets (swimming legs) of the female. The first pair is enlarged in the male (it is used to pass sperm to the female).
• The tail is fan-shaped, and ends in uropods and a telson.
• The circulatory system is open; there is no heart and the "blood" is pumped by vessels into sinuses, and does not flow in a closed loop).
• The nervous system consists of a primitive ventral nerve cord and ganglia system (similar to those of an earthworm).

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Answer 2

The chief characteristics of crustaceans are:

• Crustaceans are aquatic arthropods like shrimp, crab, lobster, etc.
• They do not have an internal skeleton.
• They have an external skeleton or the exoskeleton which is composed of calcium.
• They have two compound eyes located in their head.
• They have three pairs of mouthparts and two pairs of antennae that help them to sense the presence of their predators.
• At the base of the antennae, there is a pair of green excretory glands.

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