Pseudancistrus sidereus is a species of armored catfish known only from the upper Orinoco basin in Amazonas state, Venezuela.

[1][2] This is a fairly large loricariid (up to 17.6 centimetres (6.9 in) standard length), and is distinguished from its congeners by a strong keel on the caudal peduncle and the colour scheme which is generally very dark with bright white or yellow spots on the upperside.

[1]

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