Abstract
A new Characid fish – Knodus borki sp. n. – is described from the surroundings of Iquitos in Peru. Knodus borki sp. n. is distributed as Boehlkea fredcochui GÉRY, 1966 since many years by aquarium trade. Both species differ mainly in the dentition of maxillary bone (three to four tricuspid or conical teeth in Knodus borki sp. n. vs. 11 to 21 tricuspid and conical teeth in Boehlkea fredcochui) and in colouration. Knodus borki sp. n. is closely related with Knodus megalops MYERS, 1929. Both species differ (1) in lateral line (incomplete in Knodus borki sp. n. vs. complete in Knodus megalops), (2) in the size of eye (2,46–3,24 times SL in K. borki sp. n. vs. 2,2 times SL in K. megalops), (3) in body depth before dorsal fin (2,91–3,34 times SL in K. borki sp. n. vs. 2,9 times SL in K. megalops), (4) in head length (3,94–4,65 times SL in K. borki sp. n. vs. 3,8 times SL in K. megalops) and (5) in the colouration.
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