ectopterygoid


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ectopterygoid

[¦ek·tō′ter·ə‚gȯid]
(vertebrate zoology)
A membrane bone located ventrally on the skull, situated behind the palate and extending to the quadrate; found in some fishes and reptiles.
References in periodicals archive ?
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.
The ectopterygoid is devoid of teeth and occupies a small lateral corner between the palatine and pterygoid (Figs 2B, 6B).
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.
5): anterior arm of suspensorium consisting of palatine, relatively broad dorsally, tapering to point about midway along ectopterygoid; 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.
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.