Nicholsina is a genus of marine ray-finned fishes, parrotfishes from the family Labridae. They are found in the Atlantic and eastern Pacific Oceans. The generic name honours the American ichthyologist John Treadwell Nichols (1883-1958) who was curator of fishes at the American Museum of Natural History.
Species There are currently three species classified in the genus:
Nicholsina collettei Schultz 1968 Nicholsina denticulata (Evermann & Radcliffe, 1917) (Loosetooth parrotfish) Nicholsina usta (Valenciennes, 1840) (Emerald parrotfish)
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