Description
English: This Glaucus atlanticus was washed up on Surfers Paradise Beach in Queensland Australia. It is about 35 mm in length. The species swims upside-down and is accordingly countershaded for that position.
فارسی: لیسه دریایی آبی‌رنگ گونه‌ای لیسه دریایی است که در تیره خاکستری‌لیسه‌سانان قرار دارد.
Date 24 May 2009, 11:06 (UTC)
Source Glaucus_atlanticus_1.jpg
Author Glaucus_atlanticus_1.jpg: Taro Taylor http://www.flickr.com/people/tjt195/ from Sydney, Australia; derivative work: dapete
Source: https://commons.wikimedia.org/wiki/File:Glaucus_atlanticus_1_cropped.jpg
Source: https://commons.wikimedia.org/wiki/File:Glaucus_atlanticus_1.jpg

Glaucus atlanticus (common names include the sea swallow, blue angel, blue glaucus, blue dragon, blue sea slug and blue ocean slug) is a species of small, blue sea slug, a pelagic aeolid nudibranch, a shell-less gastropod mollusk in the family Glaucidae. These sea slugs are pelagic: they float upside down by using the surface tension of the water to stay up, where they are carried along by the winds and ocean currents. Glaucus atlanticus is camouflaged: the blue side of their body faces upwards, blending in with the blue of the water. The silver/grey side of the sea slugs faces downwards, blending in with the silvery surface of the sea. Order: Nudibranchia, Superfamily: Aeolidioidea, Family: Glaucidae, Genus: Glaucus, Species: Glaucus atlanticus Forster, 1777.