Abstract
Trisopterus is demonstrated to be monophyletic, including four distinct species: T. capelanus , T. esmarkii , T. luscus and T. minutus . The capelan T. capelanus is resurrected from the synonymy of poor cod T. minutus, and is shown to be morphologically more similar to T. luscus , to which species it is also more closely related, indicated by a phylogenetic analysis presented here. A lectotype is designated for T. luscus . Trisopterus fasciatus , the type species of Trisopterus , is a junior synonym of T. luscus , and the lectotype of T. luscus is designated as the neotype of T. fasciatus . The lectotype of T. luscus is also designated as the neotype of Gadus barbatus . Gadus barbatus has priority over T. luscus but the name is suppressed by prevailing usage of T. luscus . A neotype is designated also for T. minutus . A phylogenetic analysis using mitochondrial cytochrome b , and a fragment of the nuclear rhodopsin gene, shows that T. capelanus and T. luscus are sister species, and in turn sister to a clade formed by T. minutus and T. esmarkii .