Pea Crab facts and knowledge. Know Pea Crab food regimen, habitat, behaviour taxonomy, and so on See fascinating facts of Pea Crab in our animal facts archive.

The pea crab, Pinnotheres pisum, is a small crab within the household Pinnotheridae that lives as a parasite in oysters, clams, mussels, and different species of bivalves.

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How does it appears?

Pea crabs are small crustaceans in regards to the measurement of a pea or dime, with a "smooth dorsal surface of the carapace, or upper exoskeleton". The exoskeleton of males is tough and round and has eyes and antennae extending from their fronts, and the chelipeds are extra sturdy in males than in females, which have extra elongated chelipeds. The our bodies of the feminine pea crabs are sometimes translucent and present the inside organs and gonads as yellow and purple, with the males being a "more yellowish-grey with patches of brown".

Ecology

The relationship between the pea crab and its host is one in all parasitism, moderately than commensalism, for the reason that host could also be harmed by the crab's feeding actions. The pea crab solely depends on its host for food, security, and oxygen. Pea crabs have a wide range of hosts, a very powerful of that are mollusks. The pea crab lives within the mantle cavity of these hosts. Other hosts, as well as to oysters, include sea urchins and sand {dollars}. Pinnotheres may be discovered inside sand {dollars}, within the rectum of sea cucumbers, within the tubes of parchment worms, within the burrows of mud shrimp, or within the gills of sea squirts. Little is understood in regards to the pea crab's feeding habits, however within the associated oyster crab (Zaops ostreus ), larval levels feed on plankton introduced in by the oyster, whereas adults feed by taking the food that is part of the oyster's food regimen, in addition to what will not be. The feeding course of may be dangerous to the crab's host when it feeds on the mucous strings that assist carry the food to the host's mouth.

Mating

A male pea crab will rub the sting of a shellfish containing a feminine pea crab for hours till the shellfish opens and permits the male pea crab to enter.