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 ?
Vale la pena remarcar que actualmente en la zona de Salto se registran dos Chelidae pertenecientes a las especies Phrynops hilarii e Hydromedusa tectifera y se carece de registros de Testudinidae (FREIUERG, 1977; CEI, 1986).
2002): Una nueva especie del genero Hydromedusa Wagler (Pleurodira, Chelidae) del Paleogeno de Patagonia.
Observations on feeding habitats of Hydromedusa maximiliani (Testudines: Chelidae) in Southeastern Brazil.
Seasonal variation in the feeding habits of the Hydromedusa maximiliani (Testudines: Chelidae).
Phrynops geofroanus and Hydromedusa tectifera) observed in captivity.
Hydromedusa maximiliani seems to use a specific turning strategy to capture prey under captive conditions and perhaps also at the bottom of rivers.
Quantification of flows generated by the hydromedusa Aequorea victoria: a Lagrangian coherent structure analysis.
Vinegar as a disarming agent to prevent further discharge of the nematocysts of the stinging hydromedusa Olindias sambaquiensis.
The invasive hydromedusa Blackfordia virginica (Cnidaria: Black-fordiidae) in southern Brazil, with comments on taxonomy and distribution of the genus Blackfordia.
These new methods and technologies have allowed scientists to resolve the life cycles of many organisms whose hydroid and hydromedusa stages were previously thought to be separate species, and to conduct a variety of experimental studies in the laboratory.
The most transparent tissues (at 480 nm) were hydromedusa mesoglea (66%), followed by Cystosoma (42%), ctenophore mesoglea (41%), siphonophore mesoglea (39%), pelagic tunicares (excluding Pyrosoma) (33%), Sagitta (24%), and the translucent portions of the hydromedusae and ctenophores (24%).