cleithrum
(plural cleithra))
the principal bow-shaped bone of the pectoral girdle, dermal in origin, forming the rear margin of the gill cavity. It articulates dorsally with the supracleithrum and ventrally with the scapula and coracoid, and meets its opposite pair medially under the heart. Used in age estimation, where it is more reliable than scales in some species, e.g. Esox masquinongy

Dictionary of ichthyology. 2009.

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  • Cleithrum — The cleithrum is a membrane bone which first appears as part of the skeleton in primitive bony fish, where it runs vertically along the scapula.[1] Its name is derived from Greek κλειθρον = key (lock) , by analogy with clavicle from Latin… …   Wikipedia

  • Cleithrum — Das Cleithrum (Gr.: „kleithrom“ = Schloss, Riegel) ist ein paariger Deckknochen im Schultergürtel nicht amniotischer und primitiver amniotischer Wirbeltiere. Ein Cleithrum besitzen alle Knochenfische, es fehlt dagegen den Knorpelfischen. Bei… …   Deutsch Wikipedia

  • cleithrum — clei·thrum …   English syllables

  • cleithrum — …   Useful english dictionary

  • os cleithrum — (plural ossa cleithra)) cleithrum (plural cleithra)(the principal bow shaped bone of the pectoral girdle, dermal in origin, forming the rear margin of the gill cavity. It articulates dorsally with the supracleithrum and ventrally with the scapula …   Dictionary of ichthyology

  • proscapula — cleithrum …   Dictionary of ichthyology

  • MEMBRES — La plupart des animaux dotés d’une symétrie bilatérale possèdent des expansions paires du corps, placées latéralement de chaque côté de la région postcéphalique. Ces expansions, de nombre et de structure très variables, sont fonctionnellement… …   Encyclopédie Universelle

  • clavicle — paired dermal bone ventral to the cleithrum in Acipenseridae and Amiidae. Lost or fused with the cleithrum in Teleostei. Clavicle was sometimes misapplied for cleithrum …   Dictionary of ichthyology

  • skeleton — skeletonless, adj. skeletonlike, adj. /skel i tn/, n. 1. Anat., Zool. the bones of a human or an animal considered as a whole, together forming the framework of the body. 2. any of various structures forming a rigid framework in an invertebrate.… …   Universalium

  • Tetrapod — Taxobox name = Tetrapods fossil range = Late Devonian to Recent image width = 200px image caption = A Fire Salamander. regnum = Animalia phylum = Chordata subphylum = Vertebrata superclassis = Tetrapoda superclassis authority = Broili, 1913… …   Wikipedia

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