New species of Fabricinuda Fitzhugh and Pseudofabriciola Fitzhugh (Polychaeta: Sabellidae: Fabriciinae), with an emendation of Pseudofabriciola australiensis (Hartmann-Schröder)

Abstract

A new species of Fabricinuda Fitzhugh, F. longilabrum, is described from 60 to 70 m depth from the Gulf of Thailand, increasing the number of described species to six. Fabricinuda longilabrum most closely resembles F. pseudopalpa Fitzhugh in that both have well-developed branchial crown dorsal lips, but lack vascularized, ventral filamentous appendages. Remaining species in Fabricinuda do not have dorsal lips but do have filamentous appendages. Two new species of Pseudofabriciola Fitzhugh are also described. Pseudofabriciola filaris is from 60 to 70 m depth from the Gulf of Thailand, and P. rousei is from the intertidal along Western Australia, raising the number of described species in the genus to 13. Both species have only a single pair of dorsolateral notches on the anterior peristomial ring collar, reduced dorsal lips, and no vascularized, ventral filamentous appendages. Variation in collar form and overall body dimensions are discussed for P. filaris. The description of P. australiensis (Hartmann-Schröder), originally based on type specimens lacking a branchial crown, is emended on the basis of a complete specimen from Western Australia. The species has welldeveloped dorsal lips and vascularized, ventral filamentous appendages. Cladistic relationships among species within Fabricinuda and Pseudofabriciola are examined.

Keywords:

• Polychaeta
• Sabellidae
• Fabriciinae
• Fabricinuda
• Pseudofabriciola