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The front pincers are also biologically considered legs, so they belong in the order Decapods ("ten-footed"). [6] Although lobsters are largely bilaterally symmetrical like most other arthropods, some genera possess unequal, specialized claws. Lobster anatomy includes two main body parts: the cephalothorax and the abdomen.
The pincers of crabs, lobsters and scorpions, more formally known as their chelae, are sometimes called claws. A true claw is made of a hard protein called keratin . Claws are used to catch and hold prey in carnivorous mammals such as cats and dogs , but may also be used for such purposes as digging, climbing trees, self-defense and grooming ...
The decapod (crustaceans, such as a crab, lobster, shrimp or prawn) is made up of 20 body segments grouped into two main body parts: the cephalothorax and the pleon . [1] [2] Each segment may possess one pair of appendages, although in various groups these may be reduced or missing. They are, from head to tail:
In many decapods, one pair of these "legs" has enlarged pincers, called chelae, with the legs being called chelipeds. In front of the pereiopods are three pairs of maxillipeds that function as feeding appendages. The head has five pairs of appendages, including mouthparts, antennae, and antennules. There are five more pairs of appendages on the ...
A pseudoscorpion has eight legs with five to seven segments each; the number of fused segments is used to distinguish families and genera. They have two very long pedipalps with palpal chelae (pincers), which strongly resemble the pincers found on a scorpion.
A pair of slipper lobster (Scyllaridae) larvae. After hatching out of their eggs, young slipper lobsters pass through around ten instars as phyllosoma larvae — leaf-like, planktonic zoeae. [10] These ten or so stages last the greater part of a year, after which the larva moults into a "nisto" stage that lasts a few weeks. Almost nothing is ...
Its disproportionately large claw, larger than half the shrimp's body, is a dismorphic addition to the arsenal of the shrimp. The claw can be on either arm of the body, and, unlike most shrimp claws, does not have typical pincers at the end. Rather, it has a pistol-like feature made of two parts.
The first three pairs of pereiopods terminate with chelae (pincers), and the pair furthest front is particularly long and enlarged. Though ornamented with tubercles in P. pustulosus, the pincers are smooth and undecorated in P. lemovices. The pereiopods decrease in size the further back they are placed, the pair furthest front being largest and ...