hypural


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hypural

(haɪˈpjuːrəl)
adj
(Zoology) ichthyol relating to the bones of the area below the tail of fish
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References in periodicals archive ?
The [L.sub.s] was measured from the tip of the snout, horizontally, to the posterior tip of the notochord at the hypural plate, while [L.sub.T]was measured from the tip of the snout, horizontally, to the tip of the depressed caudal fin (Hubbs et al.
Hypural development begins during the preflexion stage, by 5.2 mm, and principal caudal-fin rays begin to form late during this stage, by 6 mm.
Vertebrae (including the Weberian ossicles and the hypural complex) were counted by examining the negatives of roentgenograms.
Lengths given for specimens are standard length (SL), the straight-line distance from the median anterior point of the upper lip to the base of the caudal fin (posterior end of the hypural plate).
Additionally, 3 to 4 pairs of neuromasts begin to develop in the area of the developing hypural plates.
The following measurements were recorded to the nearest 0.1 mm: standard length (SL--measurement from the tip of the snout to the tip of the notochord or posterior tip of hypural plates); head length (HL --measurement from tip of snout to end of operculum); eye diameter (measurement taken along widest part of eye); snout length (measurement from tip of snout to anterior edge of eye); body depth (vertical measurement taken at the pectoral-fin base); body depth at the anus (vertical measurement taken at the anus); snout to anus length (preanal length); snout to anal-fin origin; and snout to dorsal-fin origin.
After measuring standard length (tip of mouth to posterior end of hypural plate), we measured length of gonopodium (from anterior insertion to end of distal tip; Langerhans et al., 2005).
Standard length measures the distance from the tip of the longest jaw to the end of the hypural bone or caudal peduncle; however, there has been a debate regarding where the caudal peduncle or hypural bone ends (Howe, 2002).
Body length (nearest 1.0 mm) measurements were from the middle of the eye to the posterior edge of the hypural plate (MEHP).
The SL was measured from the tip of the snout, horizontally, to the posterior tip of the notochord at the hypural plate, while TL was measured from the tip of the snout, horizontally, to the tip of the depressed caudal fin (Hubbs and Lagler 2004).