said of a cartilaginous pectoral fin where basals and radials do not reach the border and so do not offer the support seen in the plesodic fin, q.v. More highly derived fish may have other support for the distal fin region such as ceratotrichia, q.v

Dictionary of ichthyology. 2009.

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  • fin web — 1) the fin membrane 2) the compressed part of the shark fin, distal to the base and supported only by ceratotrichia (q.v.) , the aplesodic fin (q.v.), or by ceratotrichia surrounding expanded fin radials or by radials only, the plesodic …   Dictionary of ichthyology

  • plesodic — said of a cartilaginous pectoral fin where ceratotrichia, q.v., reach the border and offer better support than in the aplesodic fin, q.v …   Dictionary of ichthyology

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