The pterygoid expands laterally to contact the ectopterygoid
. It borders laterally and posteriorly the posterior interpterygoid vacuity, forming a lateral flange.
Referral of the specimens to Clevosaurus is based on the presence of a lateral contact between the ectopterygoid
and palatine, which excludes the maxilla from the margin of the suborbital fenestra, and the presence of a long, posteriorly extending dorsal process of the jugal (Sues et al.
In addition to the teeth in the premaxillae, maxillae and mandibles, dentigerous areas are seen in the ectopterygoid
and accessory ectopterygoid
bones (Figure ID and IE) and in the pharynx (Figure IF).
fittkaui depicts a large endopterygoid, which reaches the posterior border of the dermopalatine, and a small ectopterygoid
that does not reach this point.
a, angular; art, articular; bo, basioccipital; d, dentary; ect, ectopterygoid
; f, frontal; j, jugal; l, lacrimal; mcg, meckelian groove; mx, maxilla; n, nasal; op, opisthotic; p, parietal; pal, palatine; pf, postfrontal; pmx, premaxilla; po, postorbital; pp, postparietal; pro, prootic; prf, prefrontal; pbs, parabasisphenoid; pt, pterygoid; q, quadrate, qj, quadratojugal; so, supraoccipital; sp, splenial; sq, squamosal; st, supratemporal; sa, surangular; ta, tabular; v, vomer
supraoccipital spine acute), by the posterior end of ectopterygoid
failing to come in contact with the quadrate bone (vs.
Peculiar configuration of anterior portion of suspensorium, the main bodies of the entopterygoid and ectopterygoid
being widely separated by the quadrate, with almost no contact, or no contact at all, between the entopterygoid and ectopterygoid
Suspensorium: Comprising palatoquadrate arch, ectopterygoid
, mesopterygoid, ectopterygoid
, symplectic, hyomandibula and preopercle (Fig 9).
5): anterior arm of suspensorium consisting of palatine, relatively broad dorsally, tapering to point about midway along ectopterygoid
articulating with quadrate along its anterodorsal edge; metapterygoid very thin, "needle-like", not articulating with quadrate or its small cartilaginous posterior edge; no symplectic process on preopercle; ascending process of premaxilla extending dorsally to anterodorsal edge of rostral cartilage; maxilla narrow, lacking process along shaft, with ventral tip curved anteriorly; dentary reduced, lacking large pocket typically receiving anguloarticular; anguloarticular articulating with dentary along ventral groove in dentary and in small anterior pocket near symphysis of dentary.
Row of very small teeth on vomer; palatine and ectopterygoid
Villiform teeth in band on premaxilla and dentary; 2-3 (1-2) rows on vomer; 2-3 rows on palatine; none on ectopterygoid
, endopterygoid or basihyal.