BULLETINOF MARINESCIENCE,54(2): 420-427, 1994 NEW RECORDS OF POL YCHAETOUS ANNELIDS (ORDER: EUNICIDA) FROM THE SOUTHEASTERN GULF OF MEXICO Alejandro Granados-Barba and Vivianne Solfs- Weiss ABSTRACT Twelve species in the Order Eunicida are newly recorded from the southeastern region of the Gulf of Mexico; 6 are new to the Gulf of Mexico and 10 are new records for Mexico, Their regional biogeographic affinities are discussed. While studies on Mexican polychaetous annelids have been conducted in the littoral zone of both coastlines, there are many areas which have either been sampled inadequately or not at all. Such is the case with the Campeche Sound, a large area located in the southeastern Gulf of Mexico known both for its shrimp fisheries and the largest concentration of Mexican oil platforms (Solis-Weiss et aI., 1991). Previous papers on the polychaetes from Campeche Sound include only two preliminary studies at the family level (Mendez-Ubach and Solfs- Weiss, 1987; Granados-Barba et aI., in press) and two that analyze the relationships between polychaetes and hydrocarbons (Gonzalez-Macias, 1989; Ortiz-Hernan- dez, 1990). As part of the interdisciplinary project IMCA-DINAMO undertaken to survey the benthic fauna of the area, we found 12 species previously unrecorded from either the Gulf of Mexico or from Mexican waters. STUDY AREA The study area is located in the Campeche Sound between 18°21'-22°28'N and 89°41'-93°55'W. This area includcs oil platforms and part of the continental shelf to a depth of 200 m (except for stations 13 and 58 of the IMCA-2 expedition) (Fig. 1). The climate is Am and Aw, warm humid and sub-humid with summer rains (Garcia, ]987) with three climatic seasons: the "dry" season from March to May, the "rainy" season, from June to October and the "nortes" (north winds) season, from November to February. The sediments consist of one group of fine deltaic type originating from nearby rivers to the west and a second group of coarser sediments high in carbonates derived from the high organic productivity of the benthos to the east (Yanez-Correa, 197]). Campeche Sound therefore consists of two contrasting conditions as a result of the mixing of oceanic and coastal waters in addition to the sediment transition zone that takes place between the terrigen and the biogenic materials. MATERIALS AND METHODS Sampling was done from thc R!V JUSTOSIERRA,as part of the interdisciplinary project IMCA- DINAMO. Herein considered are the IMCA-I and II expeditions (4-12 March 1988 (27 stations) and 19-29 September 1988 (47 stations» and DINAMO-I (7-22 March 1990), (Fig. I). The polychaetes were collected with a 0.1 m' Smith-McIntyre grab. At each station, 40 liters of sediment were taken, screened through a 0.5 mm sieve and fixed in 10% formalin. In the laboratory, the organisms wcre washed again, sorted and preserved in 70% alcohol. Depth, as well as bottom salinity and temperature were recorded at each station with a Niel Brown CTD. The organic content present in the sediments was determined as percent of organic carbon (Gaudette et aI., ]974). The systematic arrangement of Fauchald (1977) for orders and genera was followed. For each species, the total number of specimens collected is given, followed by the collection date, the station number and the abundance per station (in parenthesis). Chemical and physical data include sediment type and depth (m), "alinity (S) as %0; temperature (T) as DC;and organic content (O.M.) as % carbon. The organisms are placed in the collection located at the Instituto de Ciencias del Mar y Limnologia (lCML), Universidad Nacional Aut6noma de Mexico, Mexico. 420 GRANADOS-BARBA AND SOliS-WEISS: NEW EUNICIDA FROM MEXICO 421 "1,& A '}D" +,. (10 f6 ~ "2~r 036,42 4 '31 GULF ~23,29 122 ,30 OF ,40 ,'1 '21 19' MEXICO ,39 B 2 ' +" (10 ~ GULF OF MEXICO Figure 1. Campeche Sound area, with the sampling stations for each cruise. A) IMCA I: March 1988; B) IMCA II: September \988; C) DINAMO I: March \990. TL = Terminos Lagoon. 422 BULLETIN OF MARINE SCIENCE. VOL. 54. NO.2. 1994 RESULTS A total of 1,162 specimens was collected from the Campeche Sound which belonged to five families of the Order Eunicea and 38 species (Granados Barba, 1991). Of these 38 species, 12 are new records for this region, 6 are new records for the Gulf of Mexico and 10 are previously unknown for Mexico. Family Onuphidae Kinberg, 1865 Kinbergonuphis orensanzi (Fauchald, 1982b) Onuphis setosa Orensanz, 1974: 89. Onuphis (Onuphis) orensanzi Fauchald, 1982a: 205-208, fig. 2, tables I and 2. Kinbergonuphis orensanzi Faucha1d, 1982b: 18, fig. 8b. Material Examined.-254 indiv.: March 1988: stations 8(3),13(1),14(1),24(1),33(4), 35(]), 39(2), 43(1),44(1). Sept. 1988: stations 2(3), 7(1), 8(]9), 9(29), 12(19), ]5(4), 17(2), 18(2), 20(2), 23(3), 24(3),25(3),26(1),29(8),30(5),31(2),33(1),37(2), 38(4), 39(3), 43(1), 47(2), 48(2), 49(1), 50(2), 52(2),53(5),56(1). March 1990: stations 4(3), 5(1), 7(2), 9(9),13(1),23(8),24(2),25(2),26(5),28(4), 32(2),34(15),37(24),40(7),50(7),51(1),53(11),62(1), 82(1), 84(1). Muds, sandy muds and sands; 11-210 m; T = 14--28; S = 35-37; O.M. = 0.06-1.51. Distribution.-Southern Atlantic: Uruguay, Argentina and the Falklands, 89-130 m (Fauchald, 1982b). First record from the Gulf of Mexico and from Mexican waters off Tabasco and Campeche. Kinbergonuphis simoni (Santos et a!., 1981) Onuphis simoni Santos et aI., 1981: 663-668, fig. la-e. Kinbergonuphis simoni Faucha1d, 1982b: 32-33, fig. 10e, table 9. Material Examined.-28 indiv.: March 1988: .'<ttlum I~~ 8(1),27(1),40(1),44(1),45(1). Sept. 1988: stations 2(2), 3(9), 4(2), 6(1). March 1990: 'n';~_n AM ), 51(4), 75(1), 82(2). Muds, sands, gravel and mixed sediments; 13-143 m; T = 15.5-:U.:l; S = 34.8-37; O.M. = 0.08-1.16. Distribution.-Northern Gulf of Mexico, in Florida, intertidal and shallow waters (Fauchald, 1982.b).First record from Mexican waters off Tabasco and Campeche. Kinbergonuphis difficilis (Fauchald, 1982b) Onuphis setosa, Orensanz, 1974: 89. Onuphis (Onuphis) difficilis Fauchald, 1982a: 203-205, fig. I, table 1. Kinbergonuphis difficilis Fauchald, 1982b:l8, fig. 8a. Material t.xamined.-2 indiv.: March 1988: stations 8(1), 42(1). Sandy muds; 26--46 m; T = 22-23; S = 35.3-36.7; O.M. = 0.64-1.11. Distribution.-Southwestern Atlantic in Uruguay and Argentina, continental shelf (Fauchald, 1982b). First record from the Gulf of Mexico and from Mexican waters off Tabasco and Campeche. Mooreonuphis dangrigae (Fauchald, 1980) Onuphi.l· (Nothria) dangrigae Faucha1d, 1980: 802-806, figs. 1-2, tables 2 and 3. Mooreonuphis dangrigae Fauchald, 1982b: 58, fig. 18b. Material Examined.-6 indiv.: Sept. 1988: station 1(4). March 1990: station 58(2). Sands; 16-31 m; T = 27; S = 35.8; O.M. = 0.22. Distribution.-Carrie Bow Cay (Belize), shallow waters, in sands mixed with corals (Fauchald, 1982b). First record for the Gulf of Mexico off Tabasco and Campeche. GRANADOS-BARBA AND SOLiS-WElss: NEW EUNICJDA FROM MEXICO 423 Hyalinoecia juvenalis Moore, 1911 Hyalinoeciajuvenalis Moore, 1911: 277-280, pI. 18, figs. 86-95; Treadwell, 1937: 152; Hartman, 1944: 46-47. Material Examined.-2 indiv.: March 1988: station 4(1). Sept. 1988: station 5(1). Sands; 28 m; T = 22-27; S = 35.98-36.3; a.M. = 0.05-0.09. Distribution.-Southern California, western Mexico and Panama; from the West Indies to Colombia and Venezuela, 14-404 m (Hartman, 1944). First record for the Gulf of Mexico; off Tabasco and Campeche. Paradiopatra hartmanae (Kirkegaard, 1980) Nothria hartmani Kirkegaard, 1980: 87-88, figs. 2a-d. Sarsonuphis hartmanae Fauchald, 1982b: 73-74, fig. 22; Gathof, 1984: 39.19, figs. 39.20a-j. Paradiopatra hartmanae Paxton, 1986: 36-38. Material Examined.-31 indiv.: March 1988: stations 10(3),26(1),27(2). Sept. 1988: stations 13(1), 16(1),39(4),40(6),42(1),43(3),51(3),52(1). March 1990: stations 4(1), 7(2), 16(1),21(1). Muds and sandy muds; 93-550 m; T = 7.5-21.7; S = 34.95-36.5; a.M. = 0.67-1.32. Distribution.-Northern Atlantic, Great Britain; New England, Alabama, Florida and Texas in the U.S., fine and coarse sands, silty clays and silty sands, 37-4,265 m, (in the Gulf of Mexico: 37-189 m) (Fauchald, 1982b; Gathof, 1984). First record for the genus from Mexican waters off Tabasco and Campeche. Family Eunicidae Savigny, 1818 Marphysa bellii (Audouin and Milne Edwards, 1833) Marphysa bellii Ehlers, 1887: 95, pI. 28, figs. 1-8; Fauvel, 1923: 410, figs. 161i-q; Wesenberg- Lund, 1949: 305; Pettibone, 1963: 238, figs. 63a-d. Material Examined.-13 indiv.: March 1988: stations 10(1),24(1),43(2),44(1). Sept. 1988: stations 16(1),17(1),18(2). March 1990: station 40(4). Muds and muddy sands; 16-100 m; T = 19-26.7; S = 36.2-36.6: a.M. = 0.67-1.3. Distribution.-Mediterranean and Adriatic, Ireland, France, England, western Af- rica, Indochina; Massachusetts, Rhode Island and Florida in the Gulf of Mexico (Gathof, 1984), West Indies (Suarez and Fraga, 1978), intertidal to 189 m, sands, sandy muds, gravel, under rocks and in Zostera rootmats, fine sands and silts (Pettibone, 1963).