SCOTCAT.COM  

de Oliveira RR, Zuanon J, Py-Daniel LHR, Birindelli JLO, Sousa LM 2021 (3)

This genera is similar to the Ancistrus in appearance. They possess three stout odonodes concealed beneath the gill covers which act as a defense mechanism. Hopliancistrus tricornis is distinguished from its congeners by having four branched rays on anal fin (vs. five branched rays). Description: Distinguished from its congeners except H. munduruku by having large yellowish-white spots along the body, and dark brown spots on fins (vs. body covered by conspicuous small greenish-yellow dots of similar size on head, trunk and fins in H. wolverine; yellowish-white spots on posterior portion of the body moderate in size, usually smaller than pupil in H. xikrin; all fins covered by large yellowish-white spots in H. xavante). Can be distinguished from its congeners except H. wolverine by a narrow, bar-shaped connection strut between anterior process of compound pterotic and main body, leaving a large posterior gap (vs. connection strut as a continuous sheet). Differs from H. wolverine and H. xikrin by pectoral-fin spine length 25.1–29.9% of SL (vs. 32.1–38.4% of SL and 32.1–35.7% of SL, respectively). It also differs from H. xikrin by the transverse process of first dorsal-fin pterygiophore sutured to the transverse process of the second pterygiophore (vs. absence of contact between the transverse processes of first and second dorsal-fin pterygiophores). Differs from H. xavante by caudal peduncle depth 9.7–11.3% of SL (vs. 11.5–12.9% of SL); by narrow nasal bone plate (vs. broad nasal, sometimes slightly triangular, see Fig 2); and by having nuchal plate exposed, and covered by odontodes (vs. nuchal plate covered by thick skin and usually lacking odontodes. Habitat: Hopliancistrus tricornis is apparently restricted to the middle portion of the Rio Tapajo's basin in the São Luiz rapids, and its main tributaries, such as the lower portions of Rio Jamanxim and Rio Itapacura. This species is also found in small tributaries, such as Igarape Leitoso, tributary of the Rio Cupari, Ruro´polis municipality, Para´ State. Aquarium Care: Likes a current in the aquarium and are peaceful habitants. Likes a higher temperature and need frequent water changes to keep them in good health. Sexual Differences: Males posses a broad head region and more prominent bristling on the edge of the snout. Diet: Omnivore; veg foods such as lettuce, spinach, cucumber and veg. tablets. Live and frozen foods such as Cyclops, Daphnia and brine shrimp.

L212

None

Loricariidae

South America: Tapajós and Xingu River basins in Brazil. Type locality: Brasilien, Est. Pará, Poça de Pedra no Rio Tapajós, São Luis.

12.0cm. (4¾ins)

26-30°c (79-87°f.)

5.5-7.0.