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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 body of a crustacean is composed of segments, which are grouped into three regions: the cephalon or head, [5] the pereon or thorax, [6] and the pleon or abdomen. [7] The head and thorax may be fused together to form a cephalothorax, [8] which may be covered by a single large carapace. [9] The crustacean body is protected by the hard ...
Crustaceans (from Latin meaning: "those with shells" or "crusted ones") are invertebrate animals that constitute one group of arthropods that are a part of the subphylum Crustacea (/ k r ə ˈ s t eɪ ʃ ə /), a large, diverse group of mainly aquatic arthropods including decapods (shrimps, prawns, crabs, lobsters and crayfish), seed shrimp ...
Decapods can have as many as 38 appendages, [2] arranged in one pair per body segment. As the name Decapoda (from the Greek δέκα, deca-, "ten", and πούς / ποδός, -pod, "foot") implies, ten of these appendages are considered legs. They are the pereiopods, found on the last five thoracic segments. [2]
In crustacean development, a somite is a segment of the hypothetical primitive crustacean body plan. In current crustaceans, several of those somites may be fused. In current crustaceans, several of those somites may be fused.
Segmentation in biology is the division of some animal and plant body plans into a linear series of repetitive segments that may or may not be interconnected to each other. This article focuses on the segmentation of animal body plans, specifically using the examples of the taxa Arthropoda, Chordata, and Annelida. These three groups form ...
Carcinology is a branch of zoology that consists of the study of crustaceans. Crustaceans are a large class of arthropods classified by having a hard exoskeleton made of chitin or chitin and calcium, three body regions, and jointed, paired appendages. [1] Crustaceans include lobsters, crayfish, shrimp, krill, copepods, barnacles and crabs. [2]
Copepods have six naupliar stages, followed by a stage called the copepodid, which has the same number of body segments and appendages in all copepods. The copepodid larva has two pairs of unsegmented swimming appendages, and an unsegmented "hind-body" comprising the thorax and the abdomen. [1]
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