An expedition to the middle Rio Purus basin uncovered a remarkable new species of the genus Spinipterus . The new species has a very distinct and conspicuous colour pattern resembling a jaguar and it is almost four times larger than Spinipterus acsi , a small specimen (32 mm L S ) from Caño Santa Rita, a right bank tributary of Río Nanay in Peru and a second specimen was reported from Rio Juruá, Amazonas State, Brazil. Althoug...