PROC. BIOL. SOC. WASH. 98(2), 1985, pp. 332-340 FOUR NEW SPECIES OF SCALIBREGMATIDAE (POLYCHAETA) FROM THE GULF OF MEXICO, WITH COMMENTS ON THE FAMILIAL PLACEMENT OF MUCIBREGMA FAUCHALD AND HANCOCK, 1981 Jerry D. Kudenov Abstract.— Four new species of Scalibregmatidae (Polychaeta) are described from the Gulf of Mexico: Asclerocheilus mexicanus, Hyboscolex quadricincta, Neolipobranchius blakei, and Sclerocheilus unoculus. Mucibregma Fauchald and Hancock, 1981, is probably referable to the Fauveliopsidae. Recent systematic studies on scalibregmatid polychaetes have resulted in a generic review and classification (Kudenov and Blake 1978), and subsequent clarification and refinement of this scheme (Blake 1981). In all, 15 genera and 46 species of scalibregmatids have been described (Blake 1981; Fauchald and Han-cock 1981), not including the undescribed genus represented by Asclerocheilus californicus Hartman (Blake 198 1). Four new species are described here, including Asclerocheilus mexicanus, Hyboscolex quadricincta, Neolipobranchius blakei, and Sclerocheilus unoculus. The generic definition of Neolipobranchius is emended, and the recently described genus Mucibregma Fauchald and Hancock, 1981, is tentatively referred to the Fauveliopsidae Hartman and Fauchald 1971. This study is based on two small collections from the Gulf of Mexico. One collection derives from the Hourglass Cruises (Kudenov 1985), and was kindly made available by Thomas H. Perkins, Florida Department of Natural Resources, St. Petersburg, Florida. The other was taken as part of the Bureau of Land Man-agement's Outer Continental Shelf Baseline Environmental Survey along the coasts of Mississippi, Alabama, and Florida (MAFLA) and southwest Florida (SOW-FLA). All MAFLA samples were collected by Dames and Moore, and SOWFLA samples by Woodward-Clyde Environmental Consultants. Details of the MAFLA survey are given by Dames and Moore (1979). These materials were generously made available by Paul G. Johnson and Joan Uebelacker, Barry Vittor and As-sociates, Mobile, Alabama (Kudenov 1984). All materials including most types are deposited in the National Museum of Natural History, Smithsonian Institu-tion, Washington D.C. (USNM); two paratypes are also deposited in the Inver-tebrate Reference Collection of the Florida Department of Natural Resources Marine Research Laboratory, St. Petersburg, Florida (FSBC I). Asclerocheilus mexicanus, new species Fig. 1 Material examined. -FLORIDA, GULF OF MEXICO: MAFLA sta 221 1G, 27°56'29.5"N, 83°52'59.5"W, 43 m, Nov 1977; 1 paratype (USNM 97267). Sta 221 1H, same, Jun 1976; 1 paratype (USNM 97268). Sta 2423J, 29°37'00.8"N, 84°29'58.4"W, 19 m, silty fine sand, Jul 1976; 1 paratype (USNM 97265). Sta
4 New Species Of Scalibregmatidae (Polychaeta) From The Gulf Of Mexico, With Comments On The Familial Placement Of Mucibregma Fauchald And Hancock, 1981
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