A new Corydoras from southern Brazil
A new species of Corydoras is described from the rio São Francisco basin in northeastern Brazil, Minas Gerais and Bahia States. The new species is distinguished from most of its congeners by the anterior portion of the infraorbital 1 very large, conspicuously expanded towards the anteroventral margin of the snout and almost entirely covering its lateral margin.
Other characters that distinguish the new species are the infraorbital 2 slender on its dorsal tip, contacting only sphenotic and not compound pterotic; and the presence of two laterosensory canals on trunk. A phylogenetic analysis including the new species found it sister-group of C. flaveolus, and both species sister-group of C. paleatus.
C. lymnades is native to the upper and middle rio São Francisco basin in southern Brazil and is named for the Lymnades, small creatures derived from Goblins in Greek mythology.
These small creatures were supposedly able to take on the form of the beloved of unwary men that tried to get close to nymphs, which the Lymnades had the task of protecting, and this name was chosen due to thew new species’ small size and resemblance to the related C. garbei.
It can be told apart from other congeners by a series of morphological characters and C. garbei by its smaller, more slender body and colour pattern comprising small rounded or striated blotches scattered over the dorsal surface and oblong-shaped blotches at the junction of the lateral body plates.
For further information see the full, open access paper: Tencatt, L. F. C., H. S. Vera-Alcaraz, M. R. Britto and C. S. Pavanelli, 2013. A new Corydoras Lacépède, 1803 (Siluriformes: Callichthyidae) from the rio São Francisco basin, Brazil. Neotropical Ichthyology 11(2): 257-264