Otocinclus arnoldi explained

Otocinclus arnoldi is a species of armoured catfish native to South America, where it occurs in the lower río Paraná drainage, in the lower and middle rio Uruguai and in the río de La Plata. This species reaches a maximum length of 4.8cm (01.9inches) (SL).

Named in honor of German aquarist Johann Paul Arnold (1869–1952), who "presented" type specimen to the British Museum.^[1]

Notes and References

1. Web site: Order SILURIFORMES: Family LORICARIIDAE: Subfamilies LITHOGENINAE, HYPOPTOPOMINAE and LORICARIINAE . 22 February 2021 . Christopher Scharpf . Kenneth J. Lazara . amp . The ETYFish Project Fish Name Etymology Database . Christopher Scharpf and Kenneth J. Lazara . 22 September 2018.