Brand new mesethmoid bone of your own Acre Phractocephalus is similar to one off ?P
In progressive P. hemioliopterus brand new involved central side of the skull roof is almost totally ornamented by the reticulating ridges and you will pits, having pair or no elongate, synchronous ridges and you can sulci ( Fig. 4a). Throughout the Acre Phractocephalus the fresh new main area of the head rooftop has many elongate ridges and you will sulci also reticulating ridges and pits.
This new horizontal ethmoid bones away from P
2) Mesethmoid bones very wider ( Desk 1); dorsal skin commonly ornamented; prior border barely emarginate to gently rounded ( Fig. 3a).
The fresh mesethmoid limbs off P. hemioliopterus is relatively thin-necked, shorter extensively ornamented only centrally and you will posteriorly, and its own anterior line is emarginate or shallowly concave ( Fig. 4a). nassi.
3) Horizontal ethmoid perhaps not excessive projecting anteriorly more than palatine condyle; their lateral margin convex and you can removing orbital notch into the margin regarding skull roof ( Fig. 3a).
hemioliopterus is also not an excessive amount of projecting anteriorly over the olfactory region otherwise palatine condyle; however it is concave laterally, and has now a highly laid out orbital sulcus for the margin away from head roof ( Fig. 4a). About Acre Phractocephalus the fresh new lateral ethmoid systems much anteriorly more this new olfactory region and you can palatine condyle; it is convex laterally, removing the latest orbital sulcus towards margin off skull rooftop.
Progressive P. hemioliopterus have an unbarred prior cranial fontanelle in this a popular depression from epiphyseal escort service Santa Maria part ( Fig. 4a), while from the Acre Phractocephalus the brand new fontanelle and you can depression of epiphyseal part are lacking. (more…)