Glaucus atlanticus (common names include the blue sea dragon, sea swallow, blue angel, blue glaucus, dragon slug, blue dragon, blue sea slug, and blue ocean slug) is a species of sea slug in the genus Glaucus.[2]
These sea slugs live in the pelagic zone (open ocean), where they float upside-down by using the surface tension of the water to stay afloat. They are carried along by the winds and ocean currents. G. atlanticus makes use of countershading; the blue side of their bodies faces upwards, blending in with the blue of the water. The silver/grey side of the sea slug faces downwards, blending in with the sunlight reflecting on the ocean's surface when viewed from below the surface of the water.
G. atlanticus feeds on other pelagic creatures, including the Portuguese man o' war and other venomous siphonophores. This sea slug stores stinging nematocysts from the siphonophores within its own tissues as defence against predators. Humans handling the slug may receive a very painful and potentially dangerous sting.
^Cite error: The named reference WoRMS was invoked but never defined (see the help page).
^Lalli, C. M.; Gilmer, R. W. (1989). Pelagic snails: the biology of holoplanktonic gastropod mollusks. Stanford University Press. p. 224. ISBN 978-0-8047-1490-7.
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Facelinidae. It is known as a blue dragon, a name it shares with Glaucusatlanticus and Glaucus marginatus. This species is widespread throughout the Indo-Pacific...
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the sea slug Glaucusatlanticus (sea swallow or blue dragon), violet sea-snails of the genus Janthina, and the other blue dragon, Glaucus marginatus. Unlike...
siphonophores, etc.) that are the food source for aeolid nudibranchs. Glaucusatlanticus is a blue pelagic aeolid nudibranch. Individuals in this species can...
'upside down' with the belly uppermost. Similarly in the sea slug Glaucusatlanticus, the reverse countershading is associated with inverted habits. These...
Onchidiidae, within the clade Systellommatophora. Like many nudibranchs, Glaucusatlanticus can store and use stinging cells, or nematocysts, from its prey (Portuguese...
scientific debate. Other gastropods develop external asymmetry, such as Glaucusatlanticus that develops asymmetrical cerata as they mature. Histioteuthis is...
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nudibranchs are quite unpalatable for predators. Some nudibranchs, such as Glaucusatlanticus, are even capable of stinging humans very painfully. The nudibranchs...
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