Pseudatherospio fauchaldi, a new genus and species of Spionidae is described from material collected from a depth of 197 m off Huntington Beach, southern California. The main characteristics of the genus are the distribution and shape of branchiae, the presence of fringed neuropodial setae in anterior setigers and the structure of modified neuropodial hooks in posterior setigers. Generic affinities are discussed.
Pseudatherospio most closely resembles
Atherospio Mackie & Duff, 1986 and
Pygospiopsis Blake, 1983.
