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NUEVOS REGISTROS DE DOS ESPECIES DE ANTHOMEDUSAE (PANDEIDAE Y
NIOBIIDAE) EN EL GOLFO DE MÉXICO
Trabajo recibido el 1 de
septiembre de 1993 y aceptado para su publicación el 7 de abril de
1995
NOTA CIENTÍFICANEW RECORDS OF TWO SPECIES OF ANTHOMEDUSAE (PANDEIDAE AND NIOBIIDAE) IN THE GULF OF MEXICO
Kenia Correia-Valencia
Universidad Federal de Pernambuco. Dept.
Zoología. 50790 Recife, Pernambuco, Brasil.
Lourdes Segura-Puertas
Universidad Nacional Autónoma de México, Instituto
de Ciencias del Mar y Limnología, Estación Puerto Morelos. Apdo.
Post. 1152, 77501 Cancún, Q. Roo. México. Contribución
No.745 del Instituto de Ciencias del Mar y Limnología,
UNAM.
Por primera vez se registran dos especies de hidromedusas,
Amphinema turrida y Niobia
dendrotentaculata, recolectadas en las aguas costeras de las regiones
central y sur del Golfo de México. Los registros previos de estas
especies estaban confinados a la zona de Tortugas, Florida. La ocurrencia de
estas hidromedusas en las costas de Veracruz y el Banco de Campeche
amplían, dentro del Golfo de México, su límite occidental
de distribución.
New records are given for two species
of hydromedusae gathered in the central and southern coastal waters of the Gulf
of Mexico. Previous reports had confined Amphinema turrida
and Niobia dendrotentaculata to the Tortugas, Florida area.
Current records extend the western distribution limit of these species to
within the Gulf of Mexico, as far as the coast of Veracruz and Bank of
Campeche.
Medusae belonging to the hydrozoan family Pandeidae are chiefly characterized by the structure of the mouth, the broad and ribbon-like radial canals, the form of the gonads and the basal bulbs of the hollow marginal tentacles which are very elongated, conical and often laterally compressed. The family Pandeidae includes 19 genera of medusae (Bouillon 1985). The family Niobiidae includes only one genus with a single species, Niobia dendrotentaculata (Mayer 1900). This species is characterized by a peculiar process of growth and budding during which on each marginal tentacle bulb a small medusa, similar to the adult, develops. These small medusae are subsequently released into the water. Studies concerning the medusan fauna of the Gulf of Mexico are scarce. Fewkes (1881), Mayer (1910), Kramp (1959) and Phillips (1972) studied the composition and distribution of medusae for the northern and central waters of the Gulf, whereas in the southern region, the first account of medusan composition and distribution was presented by Correia (1992). Studies on medusan fauna from the Bank of Campeche and adjacent waters have been described by Segura-Puertas (1992) and Segura-Puertas & Ordóñez-López (1994). Despite these recent works, knowledge of this group in the southern Gulf of Mexico remains limited, and new species are still being reported for this area. MATERIALS AND METHODSThis paper is based on material obtained by the O/V "Justo Sierra" of the Universidad Nacional Autónoma de México, during the "JS-8601" (April-May, 1986) cruise and by the O/V "BIPIX" carried out by the Instituto Nacional de la Pesca, during the "BIPIX-8603" (August, 1986) cruise. Collections were made at 114 sampling stations, covering an area extending between 19º 00' and 25º 30' N and 86º 30' and 97º 30' W. Sampling was made from a depth of 200 m to the surface in oblique tows using a Bongo net 0.6 m in diameter and a 0.33 mm mesh. Only the medusae obtained from one side of the Bongo net were analyzed. Zooplankton samples were preserved in a solution of 5% buffered formaldehyde solution. RESULTS AND DISCUSSION
Family Pandeidae. Amphinema turrida (Mayer 1900)Previous records: Tortugas, Florida; Bahamas, Belize, Japan; Acapulco Harbour, Mexico; Chile; Torres Straits, Australia (Bigelow 1909, Mayer 1910, Larson 1982). New records: 2 specimens collected 28/04/86 at station 110-150, Bank of Campeche (21º 00' N - 91º 00' W); 6 specimens collected 27/04/86 at station 150-120, Bank of Campeche (19º 00' N - 92º 00' W) and 1 specimen collected 01/05/86 at station 80-200, Bank of Campeche (22º 30' N - 88º 30' W). Remarks: Amphinema turrida was first described by Mayer (1900) under the name of Dissonema turrida from specimens collected from Tortugas, Florida; the species was given the generic name of Amphinema by Bigelow (1909). This neritic species has been recorded only in the Pacific and Atlantic Oceans. It has been collected in a few locations in the eastern Pacific, but some records reported from Japan and North Australia are doubtful. Its appearance was restricted to Tortugas, Florida in the Gulf of Mexico. Present records extend the geographical distribution limit to the Bank of Campeche within the Gulf of Mexico. Family Niobiidae. Niobia dendrotentaculata Mayer 1900Previous records: Trivandrum coast, India; Vietnam; Mediterranean; New England coast; Tortugas, Florida; Mexican Caribbean; Brasil (Kramp 1968, Correia 1983, Segura-Puertas 1992). New records: 3 specimens collected 26/08/86 at station 100-30, in Northern Veracruz (21º 29' N - 97º 00' W). Remarks: Niobia dendrotentaculata was first described in great detail by Mayer (1900) from specimens taken from Tortugas, Florida. This species has a peculiar distribution, since it has been recorded at scattered locations in the Atlantic and Indian Oceans. It also has an isolated occurrence in Indo-Malayan waters, but it has never been recorded in the eastern Pacific Ocean. Nevertheless, records of its distribution may be incomplete, since many geographical regions have been insufficiently investigated. Further information on the actual distribution of this species must be obtained before its zoogeographical distribution can be characterized in full. AgradecimientosWe wish to thank Rosa María Olvera for kindly providing the facilities and the plankton collections at the Instituto Nacional de la Pesca (México). We also wish to thank Brigitta van Tussenbroek and José N. Alvarez for their critical reading of the manuscript. LITERATURABIGELOW, H. B. Mem. Mus. Comp. Zool. Harv. Reports on the scientific results of the Expeditions to the Eastern Tropical Pacific of "Albatross", from October, 1904 to March 1905. 1909. 1-245. 37: BOUILLON, J. Indo-Malayan Zool. Essai de classification des Hydropolypes-Hydroméduses (Hydrozoa-Cnidaria). 1985. 29-243. 2: CORREIA, V.K. As medusas das regioes da plataforma e oceanica dos Estados de Paraná e Santa Catarina (Operacao CONVERSUT III) Sistematica e Distribuicao. Tesis de Maestria. Universidad Federal de Paraná. 1983. 221 p. CORREIA, V.K. Medusas del Golfo de México y litoral norte/noreste de Brasil (Ocurrencia y Distribución). Tesis Doctoral. Facultad de Ciencias, Universidad Nacional Autónoma de México: 1992. 284 p. FEWKES, J.W. Bull. Mus. Comp. Zool. Harv. Reports of the Acalephae. Reports on the results of dredging, under the supervision of Alexander Agassiz, in the Gulf of Mexico, and in the Caribbean Sea, 1877-79, and along the Atlantic coast of the United States during the summer 1880, by the U.S. coast survey Steamer "Blake". 1881. 127-140. 8: KRAMP, P.L. Dana Rep. The Hydromedusae of the Atlantic Ocean and adjacent waters. 1959. 1-283. 46: KRAMP, P.L. Dana Rep. The Hydromedusae of the Pacific and Indian Oceans. Sections II and III. 1968. 1-200. (72): 13 LARSON, J.R. Smiths. Contrib. Mar. Sci. Medusae (Cnidaria) from Carrie Bow Cay, Belize. In The Atlantic Barrier Reef Ecosystem at Carrie Bow Cay, Belize. 1: Structure and Communities. K. Rutzler and I.G. Macintyre, (eds.). 1982. 253-258. 12:539. MAYER, A.G. Bull. Mus. Comp. Zool. Harv. Some medusae from the Tortugas, Florida. 1900. 13-82. (2): 37 MAYER, A.G. Medusae of the world. I. Hydromedusae. Carnegie Foundation, Washington, D.C. 1910. 230 p. PHILLIPS, P.J. The pelagic Cnidaria of the Gulf of Mexico: Zoogeography, Ecology and Systematics. Ph.D. Thesis Texas A&M University. 1972 212 p. SEGURA-PUERTAS, L. Bull. Mar. Sci. Medusae (Cnidaria) from the Yucatan shelf and Mexican Caribbean. 1992. 353-359. (3): 51 SEGURA-PUERTAS, L. and U. ORDÓÑEZ-LÓPEZ, Carib. J. Sci. Análisis de la comunidad de medusas (Cnidaria) de la región oriental del Banco de Campeche y el Caribe Mexicano. 1994. 104-115. (1-2): 30
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