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L066 along with the Xingu complex of L236, L287, L333, L399 & L400 have now been described by Sousa, L. M. de., Sousa, E. B. de., Ribeiro, R. de O., Sabaj, M. H., Zuanon, J., & Py-Daniel, L. R. 2025. Juveniles have a very different colour pattern to the adults and individuals can differ in colouration and body shape. Similar to the Panaque/Panaqolus and Peckoltia genera but have fewer and larger teeth in the lower and upper jaw. Sexual Differences: Males posses a broader and longer head and odontodes on the posterior part of the body, behind the gill covers and on the pectoral fin spines. The latter two are a lot shorter in the females. Aquarium Care: No problem with keeping in groups but only one Hypancistrus species to a tank as there has been reports of hybridisation. They prefer water that is on the warm side (26-30°c), soft and slightly acidic. Diet: Omnivores, juveniles are keen on vegetable foods whereas adults are less so. Frozen foods such as brine shrimp, mosquito larvae and mussels as well as tablet foods. Etymology: The specific name seideli: A patronym honouring Ingo Seidel, a renowned German aquarist whose decades of dedication to the care, understanding, and breeding of Hypancistrus species in captivity have made him a global authority. Ingo’s vast contributions to the knowledge of Hypancistrus (and other loricariid genera) through numerous books and lectures have significantly advanced the aquarium hobby, particularly in the realm of pleco breeding. This species is named in recognition of his unwavering passion and invaluable contributions to the field. Remarks: It has now been established that this species and L333 are the same species and if they are kept together in the same tank there is a possibility of cross breeding between them. They are in fact differently marked variants (phenotypes) of the same species.

King Tiger Pleco, L066, L236, L287, L333, L399, L400

None

Loricariidae

Brazil: Pará, Rio Xingu (Belo Monte - Vitoria).

15.0cm. (6ins)

26-30°c (79-87°f.)

6.5-7.5.

Cardoso, A. L., Carvalho, H. L., Benathar, T. C., Serrão, S. M., Nagamachi, C. Y., Pieczarka, J. C., de Sousa, L.M., Ready, J.S., and Noronha, R. C. (2016). Integrated Cytogenetic and Mitochondrial DNA Analyses Indicate That Two Different Phenotypes of Hypancistrus (L066 and L333) Belong to the Same Species. Zebrafish, 13(3), 209-216.
Seidel, I. 2008. Back to Nature guide to L-catfishes, Ettlingen, Germany 208 p.
Sousa, L. M. de ., Sousa, E. B. de ., Ribeiro, R. de O., Sabaj, M. H., Zuanon, J., & Py-Daniel, L. R. (2025). Two new species of Hypancistrus (Siluriformes: Loricariidae) from the rio Xingu, Amazon, Brazil. Neotropical Ichthyology, 23(1), e240080.