pelvic fins

同根派生

The fanning movements with the pelvic fins are sporadic.
變徑動(dòng)作與腹鰭,是偶發(fā)事件。
Most species are small bottom dwellers with a weak suction cup formed by the fusion of their pelvic fins.
大部分為底棲魚(yú),特征是具一個(gè)由腹鰭愈合而成的吸力不強(qiáng)的吸盤。
Two-winged species have only the pectoral fins enlarged; four-winged species have Both the pectoral and the pelvic fins enlarged.
有些種類具雙翼而僅胸鰭較大,有些則有四翼,胸、腹鰭皆大。
Any of numerous usually small spiny-finned fishes of the family Gobiidae, having the pelvic fins united to form a suction disk.
鰕虎魚(yú)鰕虎魚(yú)科的一種通常小的帶棘鰭的魚(yú)，具有聚合成吸盤的腹鰭
The small, thin ray, sometimes found in front of (and bound to) the first large ray is counted for pectoral fins and ignored for pelvic fins.
胸鰭第一根大鰭條前所發(fā)現(xiàn)的小且細(xì)的鰭條是被計(jì)數(shù)，但腹鰭的小且細(xì)的鰭條是被忽略的。