hyoplastra

hyoplastra

(ˌhaɪəˈplæstrə)
pl n, sing hyoplastron
(Zoology) zoology the second foremost pair of plastral bones in a turtle
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in the list of Seymour, 2015) and 42085); two right hyoplastra (ROM-42110 and 42114); three right hypoplastra (ROM-42102, 42104 and 42106); one left hypoplastron (ROM-42109); three right xiphiplastra (ROM-42053, 42054 and 42097); two left xiphiplastra (rOM-42055 and 42056).
The total length of the hyoplastra is greater than that of the hypoplastra (Fig.
The pectoral scutes are relatively long, the pectoro-abdominal sulcus being medially located close to the posterior region of the hyoplastra (Fig.
To my knowledge, the only other Miocene (Barstovian) Emydoidea is Emydoidea sp., reported by Hutchison (1981) on the basis of three hyoplastra. In the best specimen, the pectoral-abdominal sulcus is congruent with a hinge line, consistent with plastral kinesis.