Pterygoplichthys can be identified by the number of rays in the dorsal fin. More than 10 indicates that it's a Pterygoplichthys. Most other plecos have 8 or fewer rays (in particular the larger Hypostomus species that are most likely to be confused with Pterygoplichthys). These plecos have two horn-like protrusions from their head that are actually nasal flutes. The also have alligator-like ridges along the sides of their body. Colours range from a rich brown to black to mottled brown.
South America: Marañon and Ucayali River basins. Amazon, Upper Amazon, Marañón, Ucayali(click on these areas to find other species found there) Amazon, Upper Amazon, Marañón(click on these areas to find other species found there)
An adaptible omnivore that will eat a variety of foods, besides being a very good algae eater, supplement diet with sinking pellet foods and algae wafers. Vegetables and freeze dried foods also accepted.
All but the most robust of plants tend to be eaten or uprooted. Flat stones and bogwood are required to construct caves. Will even eat floating plants. A good pleco for the deeper aquarium.
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