1) Fish 2) Percoid 3) Percoid fish 4) Percoidean 1) Remora 2) Skilletfish 
(from the article `paracanthopterygian`) The Paracanthopterygii comprises six orders: Batrachoidiformes, or toadfishes, about 45 species; Gadiformes, or codfishes, about 800 species; ...any of about 100 species of small fishes of the family Gobiesocidae and the order Gobiesociformes. Clingfishes are characterized by a strong suction ... [1 related articles]
[n] - very small (to 3 inches) flattened marine fish with a sucking disc on the abdomen for clinging to rocks etc.
noun very small (to 3 inches) flattened marine fish with a sucking disc on the abdomen for clinging to rocks etc.
any fish of the family Gobiesocidae, having a sucking disk on the abdomen for clinging to stones, debris, etc.