cephalic shield

cephalic shield
Chitinous or more or less calcified covering of the head region, formed of fused tergites of cephalic somites, commonly having pleura [McLaughlin, 1980].
Chitinous, more or less calcified covering structure of head region formed of fused tergites of cephalic somites commonly having pleura [Moore and McCormick, 1969].
Head shield; the dorsal head tergites fused to form a solid cuticular plate, often with ventrolateral folds ("pleural folds") [Brusca and Brusca, 2002].
(Class Cephalocarida):
Broad, semicircular shield covering dorsal surface of head. Formed by fusion of dorsal surfaces (tergites) of first five segments. (Syn. head shield) [Stachowitsch, 1992].
(Subclass Copepoda):
Dorsal cuticular shield covering head and thoracic somites (thoracomeres) fused to it. May project anteriorly to form rostrum, posteriorly to form pair of alae. (convex, flat, regionated). (Syn. head shield, dorsal shield) [Stachowitsch, 1992].
(Class Remipedia):
Shield-like cuticular structure dorsally convering and folding over front of head (cephalon) and extending somewhat laterally and posteriorly; tapers anteriorly (in one case with narrowest part in middle) and is marked by one or two transverse grooves. (subquadrangular, subrectangular, subtrapezoidal). (Syn. head shield) [Stachowitsch, 1992].

Crustacea glossary. . 2011.

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  • cephalic shield — 1. (ARTHROPODA: Crustacea) A chitinous, somewhat calcified covering of the head region formed of fused tergites of cephalic somites, commonly having pleura. 2. (MOLLUSCA: Gastropoda) In Opisthobranchia, an expanded thickening of the dorsal… …   Dictionary of invertebrate zoology

  • head shield — See: cephalic shield [Brusca and Brusca, 2002]. (Order Cladocera): Variously developed, unpaired, shield like structure covering head [Stachowitsch, 1992]. (Class Cephalocarida): Cephalic shield [Stachowitsch, 1992]. (Class Remipedia): Cephalic… …   Crustacea glossary

  • Haminoeidae — Taxobox name = Haminoeidae regnum = Animalia phylum = Mollusca classis = Gastropoda subclassis = Orthogastropoda superordo = Heterobranchia ordo = Opisthobranchia subordo = Cephalaspidea superfamilia = Haminoeoidea familia = Haminoeidae… …   Wikipedia

  • carapace — ( ) [Baba, 2005]. Entire animal, right appendages omitted, dorsal view, based on Munida. [Baba, 2005] ( ) [Baba, 2005]. Carapace, spines, based on Munida. [Baba, 2005] Head Shield cuticular structure arising from posterior margin of cephalon,… …   Crustacea glossary

  • cephalon — A term that refers to the head of a crustacean [Brusca and Brusca, 2002]. Anterior region of the body bearing the antennules, antennae, eyes, mandibles, maxillules, and maxillae [Holdich and Jones, 1983]. Anteriormost tagma, bearing eyes, mouth,… …   Crustacea glossary

  • ala — One of pair of posteriorly directed cephalic shield extensions; in cirripeds (Balanomorpha), triangular lateral part of compartment plate delimited from paries, which is overlapped by adjacent compartment plate with or without radius. (Pl. alae)… …   Crustacea glossary

  • rostrum — (1) Anteriorly projecting, unpaired, usually rigid median extension of carapace between eyes or ocular peduncles; (2) anterior beaklike projection of valve margins overhanging incisure or notch (Ostracoda); (3) unpaired anteroventral plate of… …   Crustacea glossary

  • Haminoeoidea — Taxobox name = Haminoeoidea regnum = Animalia phylum = Mollusca classis = Gastropoda subclassis = Orthogastropoda superordo = Heterobranchia ordo = Opisthobranchia subordo = Cephalaspidea superfamilia = Haminoeoidea subdivision ranks = Families… …   Wikipedia

  • 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

  • cephalosome — Head region when this includes only somites bearing maxillipeds or gnathopods, or both [Moore and McCormick, 1969]. (Subclass Copepoda): Head region with one or two fused thoracic somites (Copepoda) [McLaughlin, 1980]. (Subclass Copepoda): One of …   Crustacea glossary

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