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propterygium: (English) In the pectoral fin skeleton of living neoselachians, the anteriormost basal cartilage, adjacent to the anterior edge of the mesopterygium and with one or more radials attached to its distal end. In batoids with expanded anterior pectoral fin lobes it becomes expanded and segmented into a propterygial basal and propterygial axis, similar to the metapterygial basal and axis. (See also: basidorsal cartilages, mesopterygium)

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