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Glossary: lamina circularis

Bony process or plate at the base of the first ( unbranched ) and second ( first branched ) ray of the pectoral-fin in most male specimens of the family Cobitidae.

It is also known as ‘Canestrini’s scale’.

The lamina circularis is depicted in these images of Lepidocephalichthys zeppelini as follows: (C) lamina circularis on pectoral-fin, and (D) medial view of pectoral-fin removed from paratype showing lamina circularis © Havird et al.