Hyphessobrycon eilyos Lima & Moreira 2003

Diagnosis: Hyphessobrycon eilyos is distinguished from its congeners by the absence of humeral and caudal spots; by the presence of numerous dark chromatophores on the lateral surface of the body, with the chromatophores intensely concentrated on the ventral region from the pelvic-fin origin to the end of the caudal-fin base; dorsal, adipose, and caudal fins with carmine red pigmentation in life; the presence of 7-11 maxillary teeth; 6 or 7 horizontal scale rows between the dorsal fin origin and the lateral line; and 15 to 19 branched anal-fin rays. Detailed comparisons between H. eilyos and congeners sharing a general dark color pattern are presented in the "Discussion" (Ref. 52338).

Vertebrae: 32 - 34

Collected in backwaters of the stream that were characteristically tea-colored, contrasting with the clear water of the mainstream, and were choked with vegetable debris from the adjacent riparian forest. The species is associated with abundant aquatic vegetation present in that stream.