The Medusa of Velella velella (Linnaeus, 1758) (Hydrozoa, Chondrophorae) |
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Authors: | Larson Ronald J |
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Institution: | Biology Department, University of Victoria Victoria, B.C. V8W 2Y2, Canada |
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Abstract: | A mature medusa of Velella velella (Linnaeus, 1758) is reportedfor the first time from the North Atlantic; previously adultmedusae were known only from the Mediterranean. This specimen,collected by SCUBA divers, is the largest specimen recordedto date. Distinctive features are: two opposite adaxial-axialpairs of perradial capitate tentacles; two marginal bulbs lackingtentacles; conical manubrium with 4 perradial longitudinal gonads;perradial exumbrellar cnidae tracts; cnidome of stenoteles andmacrobasic euryteles; and zooxanthellae within the subumbrella.Since this specimen was collected near the surface and has zooxanthellae,it is likely that V. velella medusae are epipelagic. |
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