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Distribution and habitat. Glaucus atlanticus is the blue sea slug shown here out of water on a beach, and thus collapsed; however, touching the animal directly with your skin can result in a painful sting, with symptoms similar to those caused by the Portuguese man o' war. The slug in the water.
The tips of the spines of the dorsal fin are black, and it may have a dark red cap above the eyes. There is a variant with a uniformly pale body except for the frontal part. 40 cm (15.7 in) Blue and Yellow grouper: Epinephelus flavocaeruleus: No: 90.0 cm (35.4 in) Blue dot grouper: Cephalopholis argus: No: Deep black to tan fish with blue spots ...
Eye color. Eye color is a polygenic phenotypic trait determined by two factors: the pigmentation of the eye 's iris [ 1][ 2] and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris. [ 3]: 9. In humans, the pigmentation of the iris varies from light brown to black, depending on the concentration of ...
Vision in fish. An oscar, Astronotus ocellatus, surveys its environment. Vision is an important sensory system for most species of fish. Fish eyes are similar to the eyes of terrestrial vertebrates like birds and mammals, but have a more spherical lens.
Velella. Velella is a monospecific genus of hydrozoa in the Porpitidae family. Its only known species is Velella velella, [ 2] a cosmopolitan (widely distributed) free-floating hydrozoan that lives on the surface of the open ocean. It is commonly known by the names sea raft, by-the-wind sailor, purple sail, little sail, or simply Velella.
The leafy seadragon is related to the pipefish and belongs to the family Syngnathidae, along with the seahorse. It differs from the seahorse in appearance, form of locomotion, and its inability to coil or grasp things with its tail. A related species is the weedy seadragon, which is multicoloured and grows weed-like fins, but is smaller than ...
Diadema antillarum, also known as the lime urchin, black sea urchin, or the long-spined sea urchin, [ 2] is a species of sea urchin in the family Diadematidae . This sea urchin is characterized by its exceptionally long black spines. It is the most abundant and important herbivore on the coral reefs of the western Atlantic and Caribbean basin.
African penguins grow to 60–70 cm (24–28 in) tall and weigh between 2.2–3.5 kg (4.9–7.7 lb). [ 9 ] The beak length of the African penguin varies, usually growing between 20–30 cm (7.9–11.8 in). They have a black stripe and black spots on the chest, the pattern of which is unique to each penguin, like human fingerprints.