Urea and uric acid may be stored in special large cells near the bases of the legs or excreted without the loss of much water. The respiratory system Many of the smaller crustaceans, such as the copepods, have no special respiratory organs. Gas exchange takes place through the entire thin ...
Urea and uric acid may be stored in special large cells near the bases of the legs or excreted without the loss of much water. The respiratory system Many of the smaller crustaceans, such as the copepods, have no special respiratory organs. Gas exchange takes place through the entire thin ...
Walking or crawling is the usual mode of locomotion, and the familiar sidelong gait in the common shore crab is characteristic of most members of the group. The crabs of the family Portunidae, as well as some others, swim with greatdexterityby means of their flattened paddle-shaped legs. ...
Crustaceans’ abdomen has legs, too, called swimmerets. Its ends are fan-shaped tail called the telson. Both are used to help them swim. Crustaceans are bilaterally symmetrical and thus have segmented bodies, and they have more than four pairs of the jointed leg or known as appendages. Throu...
Crustaceans are aquatic animals that have jointed legs, a hard shell and no backbone, such as crab, crayfish, lobster, prawns and shrimp. Most molluscs have a hinged two-part shell and include clams, mussels, oysters and scallops, as well as various types of octopus, snail and squid. Which...
Hopkins P M 1993 Regeneration of walking legs in the fiddler crabUca pugilator;Am. Zool.33348–356 Google Scholar Ozius verreauxii;Proc. R.. Soc. LondonB237201–212 Google Scholar Huntingford F A, Taylor A C, Smith, I P and Thorpe K E 11995 Behavioural and physiological studies of aggr...
Testes are situated in the trunk. Paired sperm ducts pass posteriorly below and to the sides of the gut before each expands into aseminal vesicle. Anejaculatory ductenters the base of theprobosciform penis, situated between the last pair of legs, and runs its length. The penis may be clot...
The cypris has a bivalved shell of chitin (a hard protein substance), cement glands on the antennules (first antennae), and a series of thoracic legs used for swimming. The cypris eventually cements itself to a hard substrate (or invades a host) and undergoes a dramatic metamorphosis. ...
Using electrophysiological equipment, the crabs’ CNS activity was measured when different parts of its body, such as the soft tissues of the claws, antennae, and legs were stimulated. The results suggest that the crabs responded to both mechanical and chemical stimuli, indicating the existence of...