Crustaceans are animals that do not have a vertebra and backbone and have a hard shell outside. The body of crustaceans is divided into three parts. These are head, thorax, and abdomen. Body consists of segments and jointed legs. Commercially used crusta
The structure, growth, differentiation and function of crustacean chelipeds are reviewed. In many decapod crustaceans growth of chelae is isometric with allometry level reaching unity till the puberty moult. Afterwards the same trend continues in females, while in males there is a marked spurt in t...
of paired maxillipeds. In the copepods the maxillipeds are followed by four pairs of swimming legs; a fifth pair is sometimes highly modified for reproductive purposes and is sometimes reduced to a mere vestige. Behind the decapod maxillipeds there are five pairs of thoracic limbs, a variable ...
The presence of five pairs of thoracic legs (pereiopods) is the basis for the name decapod (from the Greek meaning “10 legs”). Members of the order exhibit great diversity in size and structure. The macrurous (shrimplike) species, which can be as small as 1 cm (0.5 inch), have ...
The most widespread and typical crustaceanlarvato emerge from the egg is called anauplius. The main features of a nauplius are a simple, unsegmented body, three pairs of appendages (antennules,antennae, and mandibles), and a single, simple, “naupliar” eye. Nauplius larvae are found in th...
The prerequisites for such an ancestor seem to be an elongated body, two pairs of appendages in front of the mouth, a pair of mandibles behind the mouth, and numerous trunk segments with appendages that form a continuous series of similar structure. Before the discovery of the class Cephalo...
The presence of five pairs of thoracic legs (pereiopods) is the basis for the name decapod (from the Greek meaning “10 legs”). Members of the order exhibit great diversity in size and structure. The macrurous (shrimplike) species, which can be as small as 1 cm (0.5 inch), have ...
Late Silurian to present; sedentary; 6 pairs of trunk limbs (cirri); larvae free-swimming; sessile adults with carapace developed into a mantle; about 1,100 species. Order Ascothoracica Cretaceous to present; parasites on sea anemones and echinoderms; body typically enclosed in a bivalved carap...
The presence of five pairs of thoracic legs (pereiopods) is the basis for the name decapod (from the Greek meaning “10 legs”). Members of the order exhibit greatdiversityin size and structure. The macrurous (shrimplike) species, which can be as small as 1 cm (0.5 inch), have elon...