of Apode
An order of fishes without ventral fins, including the eels.
A group of holothurians destitute of suckers. See Apneumona.
Source: Webster's dictionaryFishes lacking this appendage were placed within the order Apodes; fishes containing abdominal, thoracic, or jugular pelvic fins were termed Abdominales, Thoracici, and Jugulares respectively. Source: Internet