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There are three pairs of muscles each on the dorsal and ventral side of the pelvic fin girdle that abduct and adduct the fin from the body. [citation needed] Pelvic fin structures can be extremely specialized in actinopterygians. Gobiids and lumpsuckers modify their pelvic fins into a sucker disk that allow them to adhere to the substrate or ...
The first dorsal fin is black; the second dorsal fin is greyish with the last ray being white. The base of the pectoral fin is greyish black, darkening to black towards the rear. The pectoral filaments are greyish-black with white tips and bases. The front part of the pelvic fin is greyish black with the rest of it being coloured white.
The anal fin has 3 spines and 11 or 12 soft rays and has a base which is roughly equal in length to that of the second dorsal fin. The pectoral fin has 16 to 18 unbranched rays and has a mean length of one fifth of the standard length and its tip does not extend to the tip of the pelvic fin. This species has 5 pectoral filaments, the first is ...
A small fin, positioned behind the dorsal or anal fins, that is supported by a ray or rays. fluviatile Living in rivers. free rear tips (of fins) The posterior tip of the fin that is closest to the most posterior point of the fin base. frontal ridge A ridge running along the top of the head along the midline. furcate Forked. fusiform
Macrouridae is a family of deep sea fish, a diverse and ecologically important group, [2] which are part of the order of cod-like fish, the Gadiformes.The species in the Macrouridae are characterised by their large heads [3] which normally have a single barbel on the chin, [4] projecting snouts, and slender bodies that taper to whip-like tails, without an obvious caudal fin [3] but what there ...
The pelvic fin has 4–9 rays, and the stomiiformes possess 5–24 branchiostegal rays. Their scales are cycloid , delicate and easily sloughed off; some are scaleless. The coloration is typically dark brown or black; a few (mostly Gonostomatoidei ) are silver, and photophores (light-producing organs) are common in this order.
Its dorsal fin and pectoral fin are usually clear, and its tail is clear with a faint dark spot. Its anal fin and pelvic fin are plain whitish. [ 2 ] It has large scales with only 56–70 on its lateral line , fewer gill rakers, all characteristics that indicate a degree of differentiation from the other Prosopium fishes. [ 1 ]
The dorsal fin has 11 spines and 9 soft rays while the anal fin has 3 spines and 9 soft rays. It has a rounded, moderately long caudal fin while there is a lengthened first ray in the pelvic fin . When fresh they are mainly olivaceous in colour with the edges of the scales picked out in white, there is an oblique elliptic shaped black spot on ...