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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:
The cephalothorax, also called prosoma, is composed of two primary surfaces: a dorsal carapace and a ventral sternum.Most external appendages on the spider are attached to the cephalothorax, including the eyes, chelicerae and other mouthparts, pedipalps and legs.
The molted carapace of a lady crab from Long Beach, New York. In crustaceans, the carapace functions as a protective cover over the cephalothorax (i.e., the fused head and thorax, as distinct from the abdomen behind). Where it projects forward beyond the eyes, this projection is called a rostrum.
Carapace: A hardened plate (sclerite) covering the upper (dorsal) portion of the cephalothorax; [3] see also Carapace; Carpoblem: The principal tibial apophysis on the male pedipalp; also just called the tibial apophysis; Cephalic region or caput: The front part of the cephalothorax, separated from the thoracic region by the cervical groove [4]
Horseshoe crabs are chelicerates, meaning their bodies are composed of two main parts : the cephalothorax and the opisthosoma. The first tagma, the cephalothorax or prosoma, is a fusion of the head and thorax. [25]: 555 This tagma is also covered by a large, semicircular, carapace that acts like a shield around the animal's body. It is shaped ...
The cephalothorax, also called prosoma in some groups, is a tagma of various arthropods, comprising the head and the thorax fused together, as distinct from the abdomen behind. [1] The terms prosoma and opisthosoma are equivalent to cephalothorax and abdomen in some groups.
The carapace on their abdomen almost always has a lighter shaded arrow pointing toward their cephalothorax, while the legs also have a similar arrow pattern. [ 3 ] Their eye structure consists of a horizontal row of 6 eyes, with an additional pair above the center of the row.
Lobster anatomy includes two main body parts: the cephalothorax and the abdomen. The cephalothorax fuses the head and the thorax, both of which are covered by a chitinous carapace. The lobster's head bears antennae, antennules, mandibles, the first and second maxillae. The head also bears the (usually stalked) compound eyes. Because lobsters ...