Species: Arcos poecilophthalmos, Galapagos red clingfish

Arcos poecilophthalmos (Jenyns, 1842)

Galapagos red clingfish

Tadpole shaped, with flattened body and wide flattened head; front nostril with  a wide branched flap; a few fleshy lobes under chin, but nowhere else on head; top lip broad, much wider at front than at sides; upper jaw with only compressed incisors, no canines; lower jaw with 2-3 pairs of incisors followed on each side by 3-4 canines;sucker very large, front and rear parts with a broad band of papillae, central part with 2 close-set patches of papillae,  10-12 rows of flattened papillae across front of sucker disc, 10-11 rows across rear of disc, 5-7 longitudinal rows on each central patch; a well developed flattened fleshy pad on pectoral base with a free posterior margin ; dorsal rays 8; anal rays 7; pectoral rays 23-24; caudal rays 8-10.