Into the modern P. hemioliopterus the newest related central area of the head roof is practically totally ornamented by reticulating ridges and you may pits, having few if any elongate, synchronous ridges and you may sulci ( Fig. 4a). In the Acre Phractocephalus brand new main side of the skull rooftop has some elongate ridges and you may sulci as well as reticulating ridges and pits.
New lateral ethmoid bone regarding P
2) Mesethmoid limbs extremely broad ( Table step one); dorsal epidermis widely ornamented; anterior border scarcely emarginate so you’re able to carefully circular ( Fig. 3a).
The fresh mesethmoid limbs from P. hemioliopterus is fairly thin-necked, shorter generally ornamented merely centrally and you may posteriorly, and its anterior line is emarginate or shallowly concave ( Fig. 4a). nassi.
3) Horizontal ethmoid perhaps not a lot of projecting anteriorly more palatine condyle; their horizontal margin convex and removing orbital level into margin away from head rooftop ( Fig. 3a).
hemioliopterus is also not too-much projecting anteriorly along side olfactory region or palatine condyle; but it is concave laterally, and also a proper defined orbital sulcus for the margin from head rooftop ( Fig. 4a). In the Acre Phractocephalus the new lateral ethmoid ideas far anteriorly more than this new olfactory area and you may palatine condyle; it is convex sideways, removing the latest orbital sulcus into the margin out-of head rooftop.
Modern P. hemioliopterus has actually an open anterior cranial fontanelle inside popular anxiety of epiphyseal area ( Fig. 4a), while throughout the Acre Phractocephalus the latest fontanelle and despair of the epiphyseal part lack. Continue reading “The mesethmoid bone of your own Acre Phractocephalus is similar to you to from ?P”