The most important crustaceans have ten legs {decapoda} {decapod} and can have carapace. They include shrimp, crayfish, lobster, and crab.
Decapoda can have chitin {carapace}| with calcium salts.
Warm fresh-water decapods {crayfish} {crawfish} (Astacus) have claws.
Small long-tail decapods {shrimp, crustacean} (Natantia) have fused head and thorax and segmented abdomen.
Decapods {prawn, crustacean} can be large shrimp.
Baleen whales eat euphausiacea crustaceans {krill}.
Large decapods {lobster, crustacean} have claws. Homaridae have eye stalks {eyestalk}. Homaridae have astaxanthin pigment, which binds to beta-crusta-cyanin protein and is insoluble.
Decapods {spiny lobster} (Palinuridaecan) can have no claws and spiny carapace.
Simple crabs (Merostomata) {crab} have ten legs, have pinching claws, and are chelicerates. Crabs include king crab. Horseshoe-crab eyes can see contrasts and use reflection. Blue-crab males have blue claws. Callinectes sapidus are soft-shell swimming crabs.
Burrowing crabs {fiddler crab} can have males with one large claw and one small claw.
Large crustaceans {horseshoe crab} have hard tails.
Alaska king crab or Japanese king crab {king crab} has claw width up to 3 meters, weighs up to 5 kilograms, and is white inside.
4-Zoology-Kinds-Arthropod-Crustacean-Kinds
Outline of Knowledge Database Home Page
Description of Outline of Knowledge Database
Date Modified: 2022.0225