cephalic somite

cephalic somite
One unit of cephalon bearing distnctive pair of appendages. (Syn. cephalomere) [McLaughlin, 1980].
Unit division of head region, generally recognized as one of five such parts which bear distinctive paired appendages (antennules, antennae, mandibles, maxillules, maxillae) in addition to "precephalic" acron bearing eyes [Moore and McCormick, 1969].
(Order Decapoda):
Any one of five segments (somites) of head (not including anteriormost acron). According to appendages borne, one may distinguish an antennular, antennal, mandibular, maxillular, and maxillar somite. Fused to each other and to thoracic somites to form cephalothorax. (Syn. cephalomere) [Stachowitsch, 1992].

Crustacea glossary. . 2011.

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Look at other dictionaries:

  • cephalic somite — (ARTHROPODA: Crustacea) A unit division of the cephalic region usually recognized as one of five somites that bear distinctive paired appendages; a cephalomere …   Dictionary of invertebrate zoology

  • somite — A body segment, especially of the abdomen [Chace and Hobbs, 1969]. Body segment, as in abdominal somites 1 6 [Poore, 2004]. Body segment, especially of the abdomen [Butler, T.H.]. Division of body (head, thorax, abdomen) with exoskeleton… …   Crustacea glossary

  • cephalic lobes — 1. (ARTHROPODA: Insecta) In embryology, the region of the prostomium, and usually that of the tritocerebral somite. 2. (NEMERTEA) Brain lobes on the expanded anterior region …   Dictionary of invertebrate zoology

  • body somite — (ARTHROPODA: Crustacea) A unit division comprising thorax and abdomen; see cephalic somite …   Dictionary of invertebrate zoology

  • body somite — Generally refers to unit division of thorax + abdomen in contrast to cephalic somite [Moore and McCormick, 1969] …   Crustacea glossary

  • cephalomere — Cephalic somite [Moore and McCormick, 1969]. See: cephalic somite [McLaughlin, 1980]. (Order Decapoda): Cephalic somite [Stachowitsch, 1992] …   Crustacea glossary

  • maxillule — Cephalic appendages next behind mandible, serving as mouth part. (Syn. first maxilla, maxillula. In cirripeds, also termed inner maxilla) [Moore and McCormick, 1969]. First maxilla; mouthparts immediately posterior to mandibles [Brusca and Brusca …   Crustacea glossary

  • acron — Anteriormost part of body carrying eyes, not considered to be true cephalic somite. (Syn. ophthalmic somite, presegmental region. (Some authors recognize as protocephalon anterior part of head) [Moore and McCormick, 1969]. Anteriormost part of… …   Crustacea glossary

  • antennule — First cephalic appendage, usually with peduncle of three articles and two multiarticulate flagella (sometimes antenna 1) [Poore, 2004]. First pair of cephalic appendages (antenna 1) [Holdich and Jones, 1983]. First pair of feelers, or antennae… …   Crustacea glossary

  • mandible — Most anterodorsally situated of gnathal appendages; one, of a pair, of heavily calcified jaws; the teeth. [Hobbs and Jass, 1988]. On of the heavily calcified jaws lying anterior to (beneath, in ventral view) the other mouth parts but visible in… …   Crustacea glossary

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