pelvic fin


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Related to pelvic fin: caudal fin

pelvic fin

[′pel·vik ¦fin]
(vertebrate zoology)
One of the pair of fins of fishes corresponding to the hindlimbs of a quadruped.
References in periodicals archive ?
Dorsal-fin membrane dark, lacking spots; caudal and anal fins uniformly blackish blue, thin light or unpigmented band on posterior margin of caudal fin; pelvic fins light with blue tips on rays, pelvic-fin spine white; pectoral fins dark blue dorsally, with light coloration on unbranched rays and ventral half of pectoral fins.
Pelvic fin elliptical, tip reaching between urogenital papilla and base of 2nd anal-fin ray in male, and urogenital papilla in female.
Whenever possible, the number of myomeres, spines, and rays of dorsal, anal, caudal, pectoral, and pelvic fins were recorded.
6) in head; pelvic fin short extending just beyond anus, longer in males; second ray longest 1.
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; 5-7 rows of body scales extending onto base of caudal fin; upper and lower caudal lobes each with a single, enlarged, horizontally elongate scale.
They found that the bony fish had a different mechanism of pelvic fin muscle formation from that of the cartilaginous fish, a mechanism that was a stepping stone to the evolution of tetrapod physiology.
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.
12 it was evident when first collected; head with broad blackish stripe from snout to upper rear margin of operculum, interrupted by eye; silvery spot on upper operculum immediately below aforementioned dark stripe, remainder of operculum and cheek yellowish to bronze; dorsal fins reddish with pronounced dark brown to blackish submarginal stripe and broad, white outer margin; anal fin bluish grey to yellow or reddish; caudal fin dusky grey with narrow, white posterior margin; pelvic fins dusky grey to whitish; pectoral fins translucent.
During courtship, females fan out their violet pelvic fin, suggesting that the fin is actively used during mate choice.
The first series (visible in specimens preserved with formalin and ethyl alcohol) extends along the ventral head margin from the lower jaw tip to the pelvic fin base.
40' Depth (m) 60 60 Standard Length (mm) 51 51 Meristic Counts Dorsal Fin Elements X, 10 XII, 9 Anal Fin Elements III, 10 III, 10 Pectoral Fin Rays 17 17 Pelvic Fin Elements I, 5 I, 5 Lateral line pores 29 29 Gill Rakers 5 + 9 = 14 5 + 9 = 14 Specimens Category SIO 99-100 Collection information Date 26 Apr 99 Location San Diego, CA Latitude N 32[degrees]37.