Hydra vulgaris Pallas, 1766, (=Hydra attenuata) (Cnidaria; Hydrozoa) from the Los Padres Lagoon (Buenos Aires province, Argentina).

DESERTI, MARIA IRENE; ZAMPONI, MAURICIO OSCAR

Revista Brasileira de Biociências

Brazilian Journal of Biociences

Lugar: Porto Alegre; Año: 2011 vol. 9 p. 482 - 487

1679-2343

(Hydra vulgaris Pallas, 1766, (=Hydra attenuata) (Cnidaria; Hydrozoa) from the Los Padres Lagoon (Buenos Aires province, Argentina)). This paper reports the presence of Hydra vulgaris Pallas, 1766, from the Los Padres Lagoon (Buenos Aires province, 37¨¬ 56¡¯ S; 57¨¬ 45¡¯ W), and represents the first record of this species for Argentina. The study showed that morphological characters coincide with what has been reported by other authors, such as stenoteles 10-3 ¥ìm (15.48 ¡¾ 0.44; mean ¡¾ standard deviation) long and 6-20 ¥ìm (11.75 ¡¾ 0.82) in diameter, holotrichous isorhiza 9-14 ¥ìm (11.96 ¡¾ 0.56) long and 4-7 ¥ìm (5.45 ¡¾ 0.31) in diameter, atrichous isorhiza 5-13 ¥ìm (8.00 ¡¾ 0.87) long and 3-8 ¥ìm (4.80 ¡¾ 0.38) in diameter and the desmonemes 6-12 ¥ìm (8.24 ¡¾ 0.67) long and 4-8 ¥ìm (5.70 ¡¾ 0.43) in diameter. The colour of this species is brown; the column oscillates between 1.98-9.88 ¡¿ 0.31-1.82 mm and their tentacles, ranging from 6 to 9, have a relative length of ~¨ú the length of the column. This species is dioecious; young buds have five or six tentacles, with discontinuous growth.Hydra vulgaris Pallas, 1766, (=Hydra attenuata) (Cnidaria; Hydrozoa) from the Los Padres Lagoon (Buenos Aires province, Argentina)). This paper reports the presence of Hydra vulgaris Pallas, 1766, from the Los Padres Lagoon (Buenos Aires province, 37¨¬ 56¡¯ S; 57¨¬ 45¡¯ W), and represents the first record of this species for Argentina. The study showed that morphological characters coincide with what has been reported by other authors, such as stenoteles 10-3 ¥ìm (15.48 ¡¾ 0.44; mean ¡¾ standard deviation) long and 6-20 ¥ìm (11.75 ¡¾ 0.82) in diameter, holotrichous isorhiza 9-14 ¥ìm (11.96 ¡¾ 0.56) long and 4-7 ¥ìm (5.45 ¡¾ 0.31) in diameter, atrichous isorhiza 5-13 ¥ìm (8.00 ¡¾ 0.87) long and 3-8 ¥ìm (4.80 ¡¾ 0.38) in diameter and the desmonemes 6-12 ¥ìm (8.24 ¡¾ 0.67) long and 4-8 ¥ìm (5.70 ¡¾ 0.43) in diameter. The colour of this species is brown; the column oscillates between 1.98-9.88 ¡¿ 0.31-1.82 mm and their tentacles, ranging from 6 to 9, have a relative length of ~¨ú the length of the column. This species is dioecious; young buds have five or six tentacles, with discontinuous growth.