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Didemnum Incanum
''Didemnum'' is a genus of colonial tunicates in the family Didemnidae. It is the most speciose genus in the didemnid family. Species in this genus often have small calcareous spicules embedded in the tunic and form irregular or lobed colonies. Some ''Didemnum'' species, including '' Didemnum vexillum'' and '' Didemnum perlucidem'' are considered invasive species. In early 2006, ''Didemnum vexillum'' was found covering a 230 km2 area of cobble habitat in Georges Bank off the coast of New England, and is classified as an invasive species of greatest concern in coastal areas throughout Europe, New Zealand, and North America. ''Didemnum'' sp. invasions have also been recorded in Canada, the Mediterranean, and the Netherlands. Species in this genus can be found in tropical or temperate regions. Some tropical species such as ''Didemnum molle'' have photosynthetic algae in their tunics. Species The following species are recognised in the genus ''Didemnum'': *'' Didemnum abradatu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Didemnum Molle
''Didemnum molle'' is a species of colonial tunicate in the family Didemnidae. It is commonly known as the tall urn ascidian, the green barrel sea squirt or the green reef sea-squirt. It is native to the Red Sea and the tropical waters of the Indo-Pacific region. Description A colony of ''Didemnum molle'' is composed of a number of linked zooids adhering to the substrate. Each individual zooid has a plump, urn-shaped body with a diameter of up to . The tunic (body wall) is made of a cellulose-like substance that is strong but flexible, and is perforated by numerous small holes, the buccal siphons, through which water is drawn into the body. At the top of the body is the large atrial siphon through which water flows out. The tunic is strengthened by the presence of many spherical calcareous spicules which are particularly concentrated round the neck of the urn. The colony is white, brown or green, or some combination of these colours. This hue is due to the symbiotic blue-gree ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Didemnum Arancium
''Didemnum'' is a genus of colonial tunicates in the family Didemnidae. It is the most speciose genus in the didemnid family. Species in this genus often have small calcareous spicules embedded in the tunic and form irregular or lobed colonies. Some ''Didemnum'' species, including '' Didemnum vexillum'' and '' Didemnum perlucidem'' are considered invasive species. In early 2006, ''Didemnum vexillum'' was found covering a 230 km2 area of cobble habitat in Georges Bank off the coast of New England, and is classified as an invasive species of greatest concern in coastal areas throughout Europe, New Zealand, and North America. ''Didemnum'' sp. invasions have also been recorded in Canada, the Mediterranean, and the Netherlands. Species in this genus can be found in tropical or temperate regions. Some tropical species such as ''Didemnum molle'' have photosynthetic algae in their tunics. Species The following species are recognised in the genus ''Didemnum'': *'' Didemnum abradatu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |