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The Structure and Affinities of Tarrasius probhmaticus Traquair.
Author(s) -
MoyThomas J. A.
Publication year - 1934
Publication title -
proceedings of the zoological society of london
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0370-2774
DOI - 10.1111/j.1469-7998.1934.tb07758.x
Subject(s) - fish fin , anatomy , dorsal fin , affinities , dorsum , art , biology , fish <actinopterygii> , fishery , biochemistry
S ummary . (1) Tarraskis problematicus Traquair is shown to be a Palæoniscid having the bones of the head, axial skeleton, median fin supports, and “palæniscoid” scales characteristic of the group. (2) Tarrasius is specialized in that it has become an eel‐like swimmer, and on account of this has continuous dorsal and ventral fins, a diphycercal tail, lobed vertically held pectoral fins, and no pelvic fins. (3) Tarrasius shows how a somewhat eel‐like Palæoniscid may exist, and in consequence supports the view of Goodrich that Polypterus is a Palæoniscid. L ist of L iterature cited .