Hydromedusa

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Hydromedusa

 

(1) A genus of the Rhynchocephalia family of snake-necked tortoises. It is characterized by a very long neck (which exceeds the length of the dorsal shell) and by the presence of four claws on each of the front legs. The length of the carapace does not exceed 30 cm. There are two species, both freshwater and native to South America. Hy-dromedusa lays its eggs on the shores of inland bodies of water.

(2) Medusoid individuals of certain coelenterates of class Hydrozoa.

References in periodicals archive ?
The lack of an exumbrellar component to the crumple activation system contrasts with the situation found in hydromedusae (Mackie and Passano, 1968; Mackie, 1975, 2004a; Spencer, 1975, 1978; Josephson and Schwab, 1979), in which an exumbrellar epithelial conducting system does initiate crumple responses.
Hydromedusae of the New Zealand Oceanographic Institute (Hydrozoa, Cnidaria).
The velarium is an annular flap of swim muscle extending to the bell opening that serves to shape the aperature during a swim contraction, much like the velum in hydromedusae (Gladfelter, 1972, 1973).
Key words: Hydromedusae, Blackfordia virginica, morphological variations, Chiapas, Mexico.
The two invasive species were well known non-indigenous hydromedusae Blackfordia virginica Mayer, 1910 and Moerisia inkermanica Paltschikowa-Ostroumova, 1925, found in different estuaries and harbors with intense shipping traffic along the south Atlantic coast (Genzano et al.
The hydromedusae of the Atlantic Ocean and adjacent waters.
atlanticum, another hydromedusae Olindias sambaquiensis has been observed mainly between autumn and spring.
Comparatively, the southwestern Atlantic has been better studied, with inventories of hydromedusae (Ramirez & Zamponi, 1981; Bouillon, 1999; Migotto et al.