Question

How many body segments do crustaceans have? What are they called?

Answer 1

Crustaceans shape a massive, diverse arthropod taxon which incorporates such animals as crabs, lobsters, crayfish, shrimps, prawns, krill, woodlice, and barnacles. The crustacean institution can be handled as a subphylum beneath the clade, crustacean organization is paraphyletic, and comprises all animals inside the clade Pancrustacea aside from hexapods.

Complete answer:
Their bodies are composed of three body segments - the pinnacle, the thorax and the stomach. In some species, the pinnacle and thorax are fused to form a cephalothorax that's blanketed via an unmarried large carapace.
Each or body section will have a pair of appendages. For instance, the Malacostraca has a head with 5 segments, a thorax with eight segments and the stomach has 6 segments. On the segments of the head, those include pairs of sensory antennae, one pair of mandibles (for chewing food), and two pairs of maxillae (to help the mandibles in positioning the food).
The thorax has legs, which may be specialised to be used in taking walks or feeding. The abdomen has legs generally used for swimming (swimmerets) and results in a fan-formed tail (telson).
Most Crustaceans are either male or lady and reproduce sexually. A small number, which includes barnacles, are hermaphrodites.
Most Crustaceans are motile (able to pass about independently) and may be herbivores, carnivores or detritivores. Some are parasites and live connected to their hosts.

Note: As a crustacean grows, its exoskeleton does not, so the animal ought to moult its antique exoskeleton if you want to house its expanding body. Crustacean appendages are usually biramous, meaning they are divided into elements, this includes the second pair of antennae, however no longer the first, which is usually uniramous.