hypural


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hypural

[hī′pyu̇r·əl]
(vertebrate zoology)
Of or pertaining to the bony structure formed by fusion of the hemal spines of the last few vertebrae in most teleost fishes.
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References in periodicals archive ?
ensifer, and it has melanophores on the snout and upper jaw, on the isthmus, and on the hypural margin, which are all lacking in S.
ocasoensis along the first axis (PC1) related to the distance from the dorsal-fin origin to the hypurals, dorsal-fin length, and the length of the maxilla.
During this stage, a row of 4 neuromasts along the margin of hypural plates is noticeable (Fig.
For example, when using standard length, determination of where the caudal peduncle ends greatly depends on the individual reader and where they feel the hypural bone ends.
Early flexion includes the interval from hatching until the formation of the 4th hypural and epurals, at which point the specimen is considered midflexion.
Inferior hypural is probably the result of fusion of the first two hypurals (H1 and H2).
Vertebrae 9 + 16 + hypural = 26; parapophysis developed from the sixth vertebra, its processes widely diverging, directed outward and downward.
(1998): body length (BL), distance from the tip of the snout to the notochord tip (in preflexion and flexion larvae), and to the posterior margin of the hypural bones (postflexion larvae and posttransition juvenile); eye diameter (ED), longest diameter of the eye; snout length (SnL), distance from the tip of the snout to the anterior margin of the eye; head length, distance from the tip of the snout to the posterior margin of the opercle; body depth, vertical distance on pectoral fin base; preanal length, distance from the tip of the snout to the anus.
Lengths of specimens are given as standard length (SL) except estimates of total length (TL) of fishes photographed underwater; this is the straight-line measurement from the front of the upper lip to the base of the caudal fin (end of hypural plate).
Dorsal fin X or XI, 16 or 17; anal fin III, 16; pectoral fin 19 or 20; Caudal fin: procurrent rays 4 + 4-5, segmented rays 8 + 8, middle 12 branched, total elements 24 of 25; fifth hypural present or absent Vertebrae: 10 + 19; last pleural rib on vertebra 10; epineural ribs 12; one supraneural bone.