ANALES DEL INSTITUTO DE CIENCIAS DEL MAR Y LIMNOLOGÍA


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 CIENTÍFICA
NEW 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.

125-127 Nuevos registros, Amphinema turrida, Niobia dendrotentaculata, Golfo de México. New records, Amphinema turrida, Niobia dendrotentaculata, Gulf of México.

RESUMEN

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.


ABSTRACT

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.


INTRODUCCIÓN

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 METHODS

This 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 1900

Previous 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.



Agradecimientos

We 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.


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