Glossary Search for ray (Search Options)
Definition of Term
The supporting bony elements of fins, including spines and soft rays; all fin-supports are rays, whether segmented, unsegmented or spinous, but sometimes the term ray is used to denote soft rays only. In that sense, a ray is a flexible, rod-like segmented and often branched, bilaterally paired fin support of dermal origin. Rays may be divided into soft-rays (as just described) and hard-rays or pseudacanths which are ossified, inflexible and superficially like a spine (pseudacanths are found in some Cyprinidae, all Ictaluridae, Notacanthidae, etc.). Called dermatrichs as their origin is dermal. Ray counts are given in Arabic numerals, e.g. 11-14. Simple (rudimentary) fin rays are small, unbranched, unsegmented soft rays usually found at the beginning of a fin. Spines are unpaired and unsegmented, usually sharp and stiff rods supporting the membranes of the fins. Spine counts are given in Roman numerals, e.g. X-XII.
(See also: spine, fin rays, soft ray)
Ã‰lÃ©ments osseux secondaires des nageoires, y compris les colonnes vertÃ©brales et les rayons doux ; tous les bases des nageoires sont des rayons, soit segmentÃ©s, non segmentÃ©s ou Ã©pineux, mais quelquefois le terme rayon est employÃ© pour dÃ©noter seulement les rayons doux. (See also: spine, fin rays, soft ray)
Elementos Ã³sseos que suportam as barbatanas (raios espinhosos e moles); a todos estes elementos se dÃ€o nome de raios (segmentados e nÃ£o-segmentados ou espinhosos) mas normalmente designam sÃ³ os raios moles (segmentados). (See also: spine, fin rays, soft ray)
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