""'Phallusia nigra " "'is a solitary marine tunicate of the ascidian class found in tropical seas around the world.
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This feature is a landmark for the'theory of retrogressive metamorphosis or ascidian larva theory'; the true chordates are hypothesized to have evolved from sexually mature larvae.
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Ascidians were among the first animals to be able to immunologically recognize self from non-self as a mechanism to prevent unrelated colonies from fusing to them and parasitizing them.
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In 1881 he obtained a degree in natural sciences at Marseille, followed by his doctorate of sciences ( 1884 ) at Paris with a thesis on ascidians of coastal Provence.
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This is an antique lithograph from Ernst Haeckel's " Kunstformen der Natur ", illustrating sea squirts ( Ascidiacea or "'ascidians "').
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About 90 species of fish live in the waters of the park, among them being the emperor angelfish, Almaco jack, horned helmet shells, chambered nautilus, and ascidians.
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The Portuguese oyster ( " Crassostrea angulata " ) cultivated off the Atlantic coast of France and Portugal was largely killed by an ascidian on oyster beds in the region.
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These communities are characterized by the presence of a variety of sessile organisms including ascidians, bryozoanns, mussels, tube building polychaetes, sea anemones, sponges, barnacles, and more.
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Ascidian faunas of the island chain Isla Canales de Tierra to Coiba, southern Gulf of Chiriqui and south entrance to the Panama Canal, Pacific coast of Panama . ( in prep)
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As noted by Nybakken & McDonald ( 1981 ), nudibranchs that specialize on ascidians or fleshy ctenostome bryozoans have a radula dominated by large, paired, wing-shaped lateral teeth.
