Parotocinclus planicauda Garavello & Britski 2003

Differs from its congeners by a combination of the following characters: caudal peduncle quadrangular in cross-section; adipose-fin origin vertically crossing middle length of last anal-fin ray; arrector fossae opening on each side of scapular bridge occupying one fourth to two fifths of distance from mid-ventral suture of scapular bridge to its lateral margin; abdomen totally covered with 5-7 elongated plates on each lateral series and 7-10 series between them; eye small, 2.1-2.5 times in interorbital distance; plates in longitudinal series 24-26; adult individuals measuring up to 2.7 cm SL with 22-27 premaxillary teeth and 21-24 dentary teeth (Ref. 57861).

Parotocinclus planicauda is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Suaçuí Pequeno River in Brazil. The species reaches 4.3 cm (1.7 inches) SL. It can reportedly be distinguished from its congeners by the presence of a caudal peduncle with an almost quadrangular cross-section.