pelvic fin


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Related to pelvic fin: caudal fin

pelvic fin

one of a pair of propellant/sterring organs attached to the PELVIC GIRDLE of fish.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
The first group of parameters which were differentiated as factor one (F1) viz., fish body weight, total length, dorsal fin length, caudal fin length, anal fin length, average length of the paired pectoral fins and average length of paired pelvic fins, accounted for 64.245% of the cumulative variability while the second differentiated group was on the basis of fork length of the fish body determined as factor two (F2) accounted for 16.028% of the cumulative variability (Table 4).
Pelvic fin shape in eyeless female is rounded, small, and oriented to the sides of the body, whereas in regular female stingrays, the pelvic fin is trapezoid, larger, and oriented towards the anteroposterior axis (Table 1, Figs.
9a Breast without scales except for a small patch of scales at base of pelvic fins (prepelvic): Caranx caninus
Scales cycloid; head scaled except interorbital space, snout and chin; opercle covered by seven large scales; cheek with two horizontal rows of scales below eye; naked lower flange of preopercle thin, greatest width at angle about 2 in orbit diameter in holotype; base of dorsal and anal fins with single row of large elongated scales, one per membrane; last pored scale on lateral line at base of caudal fin enlarged and pointed; terminal scale on midline just posterior to last pored scale very enlarged and pointed; no scales on paired fins; pelvic fins with median ventral process of two elongate scales about three-fourths the length of pelvic spine, thin axillary scale of each pelvic fin about three-fourths the length of pelvic spine.
simple (unbranched); a scaly appendage of 2 or 3 scales (Axial scale) present at the base of pelvic fins. PPL contained 38.13-43.61 % (m; 40.84) of TL; 47.36-57.53% (m; 52.28) of SL; 42.30-50.52% (m; 45.65) of FL; 154.14-201.51% (m; 181.12) of HL.
These fish could survive on land, breathing air and using their pelvic fins to propel themselves.
The lack of the pelvic fin, which has the same evolutionary origin as human legs, in seahorses was traced to a missing gene called tbx4.
Counts included: dorsal fin spines and rays, anal fin spines and rays, pectoral fin rays, pelvic fin spines and rays, caudal fin rays, gill rakers on the first gill arch, vertebrae, scales in lateral line, scales above lateral line, and scales below lateral line.
This group is easily identifiable due to the long dorsal fin, which begin before the pelvic fin in males and the presence of two small black spots in the caudal peduncle of females.
Dorsal and anal fins each flanked basally by 10-12 half scales, remainder of dorsal and anal fins without scales; large, diamond-shaped scales covering pelvic-fin base, remainder of pelvic fin and pectoral fin without scales; 6 rows of body scales extending onto base of caudal fin; upper and lower caudal lobes each with a single, enlarged, horizontally elongate scale.
The following measurements were taken: Tl, total length; Stdl, standard length; Hl, length of head; Sl, length of snout; Ml, length of the maxillary; Ed, anteposterior eye diameter; Id, interorbital distance; L1stds, length of the 1st dorsal spine; L3rd as, length of the 3rd anal spine; Ldr, longest dorsal ray; Lar, longest anal ray; Bw, maximum body width; Bthick, maximum body thickness; Pal, preanal distance; Ppl, prepelvic distance; Pdl, predorsal distance; Lpel, length of pelvic fin (right fin); Lpec, length of pectoral fins (right fin); Lc length of caudal fin.
In total, there were 23 morphological characters chosen that were related to the swimming behaviour and trophic ecology of species: standard length (SL), maximum body height (MBH), body midline height (BMH), maximum body width (MBW), caudal peduncle length (CPdL), caudal peduncle height (CPdH), caudal peduncle width (CPdW), caudal fin height (CH), anal fin length (AL), pectoral fin length (PtL), pelvic fin length (PvL), head length (HdL), head height (HdH), head width (HdW), eye height (EH), mouth height (MH), mouth width (MW), dorsal fin area (DA), caudal fin area (CA), anal fin area (AA), pectoral fin area (PtA), pelvic fin area (PvA) and eye area (EA).