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Fig. 3. Left maxilla of Protostega gigas Cope, 1872, specimen ZIN PH 1/291: a – lateral view; b – ventral view; c – anterior view; g, d – medial view (d – explanatory drawing); Penza region, Serdobsky district, Malaya Serdoba 2; Upper Cretaceous, Campanian, Rybushkinskaya suite. Key: ane – apertura narium externa; ani – apertura narium interna; da – depression lateral to apertura narium interna; fas – foramen of alveolare superius; fn – fossa nasalis; fsm – (?) foramen supramaxillare; gas – groove leading to foramen of alveolare superius; lar – labial ridge; lir – lingual ridge; mg – medial groove; o – orbit; sj – sutural surface for the zygomatic bone; spf – sutural surface for the prefrontal bone; spl – sutural surface for the palatine bone; spm – sutural surface for the premaxilla; sv – (?) worn sutural surface for the vomer. White line – edge of the suture for the premaxilla on the outer surface of the maxilla, dashed black line – reconstructed edges of the bone. Scale bar – 5 cm. |