Symbolophorus reversus: A New Species of Lanternfish from the Eastern Pacific (Myctophiformes: Myctophidae)

We describe a new species of lanternfish, Symbolophorus reversus (Myctophidae), from the eastern and central Pacific. Males of S. reversus can be distinguished from all other species of Symbolophorus by the presence of a supracaudal gland that is composed of 5–8 large, nonoverlapping luminous plates, each with a concave edge that faces posteriorly. Comparison of the slopes of several morphometrics relative to standard length show statistically significant differences between males of S. reversus and its closest relative, S. evermanni. Males of S. reversus tend to have shallower bodies, shorter heads, smaller orbits, and longer preanal, preadipose, predorsal, and prepelvic fin lengths.