hyomandibula


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hyomandibula

a bone or cartilage present at the end of the hyoid arch that forms part of the jaw structure in fish and the STAPES in higher vertebrates.
References in periodicals archive ?
Regarding the genus Benthobatis, there is available information on the neurocranium, hyomandibula, branchial arches, scapulocoracoid, propterygium, synarcual, pelvic girdle and clasper (Carvalho 1999a, Rincon et al.
Sphenotic and pterotic forming facets articulating with hyomandibula.
Suspensorium: Comprising palatoquadrate arch, ectopterygoid, mesopterygoid, ectopterygoid, symplectic, hyomandibula and preopercle (Fig 9).
Hyomandibula with ventral projection joined to preopercle ventral ramus.
In these jawed vertebrates (gnathostomes), the hyomandibula played a dual role in feeding and gill ventilation.
Both embryologic fossil records and comparative anatomic evidence suggest that the transformation of the hyomandibula into the stapes--along with the development of the eardrum, the middle ear cavity, and an area for the reception of sound in the vestibular apparatus--occurred independently in modern amphibians (e.
The hyoid arch forms the jaw supports; the upper portion of the hyoid arch forms the hyomandibula (which eventually becomes the stapes), and the lower segments of the hyoid arch form the hyoid apparatus.
The observed shape contrast involving deformation of the hyomandibula, in particular evolution of the anterior lamina of that bone (Arratia 1992, p.
0] The plesiomorphic condition seems to be that in which the levator adductor arcus palatini inserts not only on the hyomandibula but also on the metapterygoid, as is the case for example in Amia, Lepisosteus and many teleosts examined (e.
Prominent, long, thin and posteroventrally directed posterior process of hyomandibula.
Two articulatory heads of hyomandibula for neurocranium.
Five synapomorphies are commonly listed in catfish literature to support the monophyly of the subfamily Heptapterinae, namely: 1) "posterior limb of fourth transverse process laterally expanded above swimbladder and notched once to several times"; 2) "neural spines of Weberian complex centrum joined by a straight-edged, horizontal or sometimes sloping bony lamina"; 3) "process for insertion of levator operculi muscle on posterodorsal corner of hyomandibula greatly expanded"; 4) "quadrate with a free dorsal margin and bifid shape, its posterior and anterior limbs articulate separately with hyomandibula and metapterygoid"; 5) "presence of an anteriorly recurved process drawn out from ventrolateral corner of mesethmoid" (Lundberg et al.