Hypancistrus and similar Plecos Hypancistrus/Panaquolus spp.

Tiger Pleco Looking more like a frog with a mermaid tail than a fish, this is one of the gold-striped Tiger Plecos, Hypancistrus spp.
Tiger Pleco At time of writing it is not yet fully described and assigned a species name. Others in the genus are also called Tigers.
There are several similar small plecos with bright gold stripes on dark or with black and white stripes. Many are called Tiger and Zebra. Some are named and some have only a reference number and have yet to be fully described. All are native to their particular area of a river basin in the northern half of South America.
Tiger Pleco
Tiger Pleco
Unsure whether the above is a juvenile of the Tiger Pleco above or a separate, related species.
King Tiger Pleco
King Tiger Pleco
King Tiger Pleco
Above is one of the King Tiger Plecos, Hypancistrus species, number L066, of the River Xingu in northern Brazil. (L333, from the same area, is also called the King Tiger Pleco, but has a slightly different pattern, especially on the dorsal fin.)
Tiger Panaqolus
Tiger Panaqolus
Above is the Tiger Panaqolus, Panaqolus tankei, L398, of the lower Xingu River, Brazil. Only recently described, it grows to some 13cm long.
Striped Panaquolus The Striped Panaqolus, Panaqolus albivermis?, L204, also called Peru Striped Flash, is native to Peru's Amazon tributaries. The stripes are white rather than yellow.
Zebra Pleco
Zebra Pleco
Zebra Pleco
The striking Zebra Pleco, Hypancistrus zebra, (L046), is native to the Amazon's Xingu tributary in Brazil. It grows to 7-8cm long. There is a curly-lined version, L098, a variant of the same species.