Urohyal

U`ro`hy´al


a.1.(Anat.) Of or pertaining to one or more median and posterior elements in the hyoidean arch of fishes.
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The hyoid apparatus of the Chinese goose is composed of a single entoglossal bone, paired rostral basibranchial bones, an urohyal bone, paired ceratobranchial bones, and paired epibranchial bones.
The entoglossal bone of a Chinese goose has a continuation as cartilage reaching as far as half of the apex length (11) and the length of the urohyal bone is as long as the basibranchial bone.
Many structures have been used to estimate the age of fishes, including scales, otoliths, vertebrae, fin rays and spines, opercular bones, cleithra, urohyal bone, and hyomandibular bone.
Davis and West (1992) used ANOVA to show that there were differences in the marginal increment of urohyal bones of L.
Davis and West (1992) found that the time of formation of a new translucent growth-ring on urohyal bones for L.
QC3, quantification code 3, identified to family: basi-branchial, basioccipital, basipterygium, ceratohyal, coracoid, ethmoid, ectopterygoid, epihyal, exoccipital, frontal, hyomandibular, interhyal, interopercular, lacrimal, lower hypohyal, opercular, opisthotic, otolith, palatine, prefrontal,' preopercular, prootic, pterotic, supracleithrum, scapula, supraoccipital, sphenotic, symplectic, urohyal, upper hypohyal.
Additionally to the above the genus Papiliolebias is characterized by: urohyal, dorsal process branched (also in some species of Pituna); third epibranchial, uncinate process, forming an angle of 45-60[degrees] with distal process (also in rivulines but not in plesiolebi-asines); posttemporal, ventral process present; opercular region with regular reticulate pattern formed by iridescent colour on middle of scales contrasting with dark orangish brown pigment along entire scale margins (also in Pituna); and humeral region with iridescent blotch (also in Pituna) (Costa 2011).
9); ventral hypohyals, dorsal hypohyals and urohyal ossified; urohyal extremely thin; basibranchials 2, 3 ossified; basibranchial 4 either absent, unstained or too small to discern; hyobranchials 1, 2, and 3 cartilaginous; ceratobranchials 1, 2, 3, 4 cartilaginous at tips; ceratobranchial 5 completely cartilaginous and fused with lower pharyngeal plate; lower pharyngeal plate ossified, possessing large conical teeth with slightly recurved tips.
3); one pair of slender uroneurals; three epurals; a free parhypural; three thin supraneurals, generally straight; two supernumerary spines on first dorsal pterygiophore; no procumbent spines (spurs); thin Y-shaped basisphenoid, free from parasphenoid and prootics; neurocranium with frontal tabs similar to Vincentia Castelnau, 1872 (Fraser 1972: pl 31); supramaxilla absent; posttemporal smooth or with 1-3 small serrae on posterior margin; preopercle with 2-3 small, widely spaced serrae near angle, ridge smooth; infraorbitals smooth; infraorbital shelf present on third bone; ring of scleral cartilage, no ossification present; 7 branchiostegals; ceratohyal notched, suture smooth with epihyal; urohyal with short anterior process.