Ambophthalmos, a new genus for "Neophrynichthys" magnicirrus, and "Neophrynichthys" magnicirrus, and the systematic interrelationships of the fatheadsculpins (Cottoidel, Psychrolutidae)

The new genus Ambophthalmos is recognised for "Neophrynichthys'' angustus a nd "Neophrynichthys" magnicirrus, two southern Pacific psychrolutids. A hyp othesis of psychrolutid phylogenetic relationships based on parsimony analy sis of osteological characters is presented. Two synapomorphic characters s uggest that A. angustus and A. magnicirrus form a monophyletic group: the s upratemporal is posteriorly fused to the posttemporal and arch 2 is mediall y fused to its antimere. Four characters suggest that Cottunculus is monoph yletic and five synapomorphic characters suggest that Ambophthalmos is sist er to Cottunculus. A cladistic classification of the Psychrolutidae include s five subfamilies sequenced as Dasycottinae, new; Eurymeninae, new; Cottun culinae, redefined; Malacocottinae, new; and Psychrolutinae, unchanged.