metapterygium


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metapterygium

[mə¦tap·tə¦rij·ē·əm]
(vertebrate zoology)
The posterior one of three basal cartilages in the pectoral fin of sharks and rays.
References in periodicals archive ?
In dorsal view, three other elements of the pectoral girdle can be observed: propterygium, mesopterygium and metapterygium. The propterygium is anteriorly articulated with anterorbital cartilages.
In dorsal view, the pectoral girdle has three more elements: the propterygium, mesopterygium and metapterygium, the more variable of which is the mesopterygium articulating the other two.
marcida, Narcine brasiliensis and Diplobatis picta is smaller than the proterygium and metapterygium (Claeson 2014).
Porbeagles, postnatal shortfin makos, and Sanzo's embryo all have an unsegmented metapterygium in their pectoral fin skeletons, whereas white sharks have a transversely segmented basal metapterygium (Compagno and Gottfried, unpubl, data).