Monomitopus magnus, a new species of deep-sea fish (Ophidiidae) from the western North Atlantic

Monomitopus magnus new species is described from slope waters off the southeastern coast of North America. M. magnus is most closely related to M. americanum from the continental slope of Uruguay and southern Brazil and is more distantly related to the western Pacific M. pallidus. M. magnus differs from M. americanum in having fewer developed gill rakers on the anterior arch (10–11 compared to 14–22) and more precaudal vertebrae (15 compared to 13–14). The 13 nominal species of Monomitopus are divided into three groups based on head shape and degree of ossification.