Rev. Biol. Trop., 45(3): 1263-1271, 1997 Pr imer regist ro de una marea roja de Prorocentrum mexicanum (Prorocentraceae) en el Golfo de California (Recibido 24-VI-1996. Revisado 16-VI-1997. Aceptado 16-VI-1997.) Key words: red tide, Prorocentrum mexicanum, Bahía de La Paz, Golfo de California. Material examinado. En abril de 1992 se y de diminutas espinas. En posición valvar tiene colectó una muestra superficial de una marea roja forma oval y el polo apical tiene una depresión en Bahía deLa Paz y se preservó con formol al 3 profundaque alberga el poro flagelar. Presenta una %. Los ejemplares se depositaron en la colección espina apica! corta, fina y ligeramente curva, del Laboratorio de Fitoplancton del CICIMAR. provista de una delicada ala. Es característico de Ámbito anterior. Esta especie fue descrita áreas costeras, de hábitat bentónico-detrítico, por primera vez para las aguas del Pacífico epífito y epizóico sobre macroalgas y cangrejos Mexicano por Osorio (1942). Se encuentra en (Faust 1995). Las dimensiones promedio de los sinonimia con P. maximum y P. rathymum ejemplares medidos fueron: longitud total= 48.3 (Steidinger y Tangen 1996). Los pocos registros ¡.tm. ancho=32.3 ¡.tm. que se tienen a nivel mundial son: en las costas de las Islas Vírgenes (Carlson y Tindall 1985), del Japón (Okamoto 1992) y de Australia (Hallegraeff REFERENCIAS 1993). Nuevo ámbito geográfico. La Carlson, R.D. & D.R. Tindall. 1985. Distribution and periodicity of toxic dinoflagellates in the Virgin descripción original de la especie se hizo a partir Islands, p.l71-176 .. In D.M. Anderson, A.W. White& de ejemplares encontrados en el Golfo de D.G. Baden (eds.). Toxic dinoflagellate. Elsevier, Tehuantepec (16° 9' N, 95° 3' W). Con este Amsterdam, Holanda. registro, el ámbito geográfico de P. mexícanum se Faust, M.A. 1995. Benthic, toxic dinoflagellates: An extiende aproximadamente unos 1 800 km, hasta overview, p. 847-854. In P. Lassus, G. Arzul,E. Erard, la porción sur del Golfo deCalifornia (24021' N, P. Gentien & M. Marcaillou (eds.).Harrnful marine algal blooms. Lavoisier, Intercept, Francia. 110° 21' W). Comentarios: La temperatura del agua fue de Hallegraeff, G.A. 1993. A review of harrnful a1gal blooms and their apparent global ¡ncrease. Phycologia 24.5°C. El parche observado deP. mexicanum era 32: 79-99. de color amarillento, con una longitud de 20 m y una concentración de 3 135 200 cels/L Su Okamoto, K. 1992. Dinoflagellates found in Hamana Lake. I. Genus Prorocentrum. Bull. Plank. Soco Japan presencia en estas aguas es relevante, ya que ha 38: 121-133. sido vinculada con la producción de·ciguatoxinas (Carlson y Tindall 1985. Faust, 1995). En la Osorio, T.B.F. 1942. Notas sobre algunos dinoflagelados planctonicos marinos de México, con descripcion de muestra estuvieron presentes otros taxones nuevas especies. Anales Ese. NaI. Ciencias Biol. Inst. causantes de mareas rojas como P. micans (174 Politéc. NaI. 2: 435-447. 800 cel/l) y P. gracile (268 000 cellI). P. Steidinger, K.A. & K. Tangen. 1996. Dinoflagellates, p. mexicanum es un organismo unicelular, cuyo 387-584. In Identifying Marine Diatoms and cuerpo es medianamente comprimido. Sus valvas Dinoflagellates. Academic, San Diego. se hallan ornamentadas de puntuaciones esparcidas l l Gárate-Lizárraga Ismael y Martínez-López Aída Laboratorio de Fitoplancton, Departamento de Plancton y Ecología Marina, Centro Interdísciplinario de Ciencias Marinas, CICIMAR-IPN Apartado Postal 592, La Paz, Baja California Sur, México, C.P. 23000 ¡ Becarios COFAA 1264 REVISTA DE BIOLOGIA TROPICAL Ra nge exten sion oC Psammocora stellata (Scleracti nia: Si derastreidae ) in tbe Gulf of Californ ia, Méxi co (Received 3-X-1996. Corrected 5-II-1997. Accepted 19-5-1997.) Keywords: Psammocora stellata, biogeography, Gulf of California, coral, México, eastern Pacifico Thecoral Psammocora stellata (Verrill, 1866) 110° 41'W) and Isla El Pardito (240 51'N, 1100 is oue of the most common sclf;)ractinian of the 38'W). They represents the northernmgst eastern Pacífic (Glynn in press). After tlle El Niño populations of P. stellata in the west coast of Southern Oscillation of 1982-83, its population Amenca, and extend the know range of this coral decreased drastically and tlle species was almost about 100 km north. extinct in Galápagos and Panamá (Glynn 1994), We thank D. Steller and S. B. Kollun for but fortunately, it is now tmder a remarkable logistic support and assistance in the field. recuperatíon process (Glynn in press). There are Partía! funding for field work was provided by just a few records of P. stellata in México, most Comisión Nacional para el Conocimiento y Uso of them from the Gulf of California (López Pérez de la Biodíversidad de México (CONABIO; grant 1996). In this paper we report tlle finding of FB432/H337/96). several previously unknowll populations of P. stellata, which extend the known northern distribution limit of this understudied coral. REFERENCES Taxon. Psammocora stellata (Verrill, 1866) Glynn, P.W. 1994. State of the coral reefs in the Galápagos Islands: natural vs anthropogenic irnpacts. Comments. This species has been reported Mar. Poli. Bull. 29: 131-140. from México (240 N) to Isla La Plata,· Ecuador (10 Glynn, P.W. 1996. Eastero Pacific reef coral S), in the eastern Pacific (López Pérez 1996). biogeography and faunal flux: Durharn's dilernrna revisited. Proc. 8th Int. Coral Reef Syrnp. Panamá. In Specifically in the Gulf of California, P. stellata press. was recorded at Isla San Francisco (240 51' N, L6pez Pérez, A. 1996. Biogeografía histórica de los 110° 34' W), Isla Ballena (24.0 30' N, 110° 25' corales herrnatipicos (Anthozoa: Scleractinia) del W), La paz (240 lO' N, 110° 20' W) and Cabo Pacífico oriental tropical. Tesis de Licenciatura, W) Universidad Autónoma de Baja California Sur, La Pulrn.o (230 22' N, 109° 25' (Reyes Bonilla Paz, México. 1992). In July, 1996, several small colonies of Reyes Bonill¡¡, H. 1992. New records of hermatypic the species « 10 cm height) were seen from O to corals in the Gulf of California, with an historical 15 m depth at rocky reefs or walls fromIslas Las and biogeographical discussion. J. Nat. Hist. 26: Galeras (250 43' N, llIo 03' W), Isla Catalina 1163-1175. (250 35'N, 1100 49'W), Isla San Diego (250 lO'N, Edgardo Ochoa L6pezand Héctor Reyes Bonilla. Universidad Aut6noma de Baja California Sur. Departamento de Biología Marina. Apartado postal 19-B, CP 23080. La Paz,B.C.S. México. 1266 REVISTA DE BIOLOGIA TROPICAL Commentary: Three individuals of 2.5 mm (1988). Our specimens are larger than theirs (1. 75 length x 1.0 mm wide, . with one nuclear whorls x 1.0 mm) but have the same color pattero. and four whorls. White shells with beaded axial ribs, deep sutures. The individuals were found by Family CERITHIIDAE Fleming, 1822 brushing stones and under hardsubstrates and reef Retilaskeya bicolor (C. B. Adams, 1845). stones of the frontreef between 15 to 20 m depth. This species has been previously reported from Previous distribution: Caribbean (Abbott the Lesser Antilles, southero Caribbean. A. 1974, page 109 as Cerithiopsis bicolor) and Cuba chiriquiensis Olsson & McGynty 1958, is a (Rolán and Espinosa 1992, pages : 40-41. fig. related species. 1,2,5,6. Espinosa et al. 1994). New record: Puerto Morelos backreef, North Stosicia aberrans (C. B. Adams, 1850). Quintana Roo, Mexico. Commentary: We collected five individua1s Previous distribution: Brazil to The Antilles with soft parts. The biggest measuring 9 x 3.0 mm (Clench and Turner 1950, Warmke and Abbott and the smallest: 5 x 2.0 mm. The protoconch has 1961 as Alvania aberrans PI. 10j page. 59, Abbott two whitish nuclear whorls and nine light brown 1974 as Alvania aberrans page. 72, No. 606) and whorls in the teleoconch. The shell has two Aruba, Curacao (Jong and Coomans 1988 as beaded cords in each world anda brown cord in the Rissoina aberransPI. 11, Fig. 116). suture.This species lives under backreef stones, in New record: Puerto Morelos frontreef, north of shallow waters (1 to 2 m). This species has been Quintana Roo, Mexico. reported for the Caribbean by. Abbott (1974) Commentary: Three individuals of 2.5 x 1.0 without mentioning the localities where it was mm with the nuclear whorl broken and four whorls found. in the teleoconch. The sculpture is cancellate, inside the outer lip has two teeth. They were SuborderHETEROGLO SSA obtained between 15 to 20 m depth by brushing FarnilyCERITHIOPSIDAE H. and A. Adams, 1854 stones and under hardsubstrates and reef stones. It Cerithiopsis ara Dall and Bartsch 1911. has not been previously reported east of Yucatan Peninsula, the only zone of Mexico located in the Previous distribution: Bermuda, Aruba, Caribbean. Vokes and Vokes (1983) registered Curacao and Bonaire (Jong and Coomans 1988, only Rissoina bryerea, R. catesbyana, R. ftscheri, PI. 3, fig. 220) and Cuba (Espinosa et a!. 1994). R. striosa, R. cancellata, R. decussata and R. New record: Puerto Morelos backreef, North multicostata. Quintana Roo, Mexico. Commentary: Two shells of this species were Family Barleeinae Gray, 1857 obtained: one with the soft parts and protoconch. Barleeia creutzbergi (long and Coomans 1988). The size of the complete shell is 2.5 x 1.0 mm. It has five nuclear whorls and seven whorls. The Previous distribution: Aruba, Curacao (Jong shell is dark brown wíth cream spiral beaded and Coomans 1988, PI. 1 fig. 123), La Havana, bands. It was found living in the shallow waters (1 Cuba (Espinosa et al. 1994). to 2 m) of the backreef, under stones. This specie New record: Puerto Morelos frontreef, North has been reported for the Caribbean. Its finding at Quintana Roo, Mexico. Puerto Morelos indicates that its distribution i s Commentary: The material exarnined consists not restricted to insular areas.