- ossa cleithra
plural of os cleithrum
Dictionary of ichthyology. 2009.
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os cleithrum — (plural ossa cleithra)) cleithrum (plural cleithra)(the principal bow shaped bone of the pectoral girdle, dermal in origin, forming the rear margin of the gill cavity. It articulates dorsally with the supracleithrum and ventrally with the scapula … Dictionary of ichthyology