Otocinclus vestitus

Otocinclus vestitus
Silver Otocinclus
The O. vestitus is mottled grey on the top half of the body, the lateral line is marked with a thin horizontal line which runs from the nose to the base of the caudal fin.
The caudal markings are what separate this Otocinclus from the similar Otocinclus macrospilus. On the O. macrospilus, there is a large round black spot at the base of the caudal fin with two faint black bars running down to the end of the tail.
However on the O. vestitus this large black spot is just a thin line (with its two similar black bars) running down to the very end of the caudal fin.