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. Its name is derived from Greek κλειθρον = `key (lock)`, by analogy with `clavicle` from Latin clavicula = `little key`. In modern fishes, the cleithrum is a large bone that extends upwards f...
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http://en.wikipedia.org/wiki/Cleithrum
A bone at the rear of the skull of a fish. It is the main bone supporting the pectoral fin
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http://english-fly-fishing-flies.s3-website-eu-west-1.amazonaws.com/glossar
(from the article `skeleton`) ...components become ossified to form dermal bones. In primitive bony fishes—such as the lungfishes, sturgeon, and coelacanths—the main element added ...
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http://www.britannica.com/eb/a-z/c/95
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