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Saccoglossus Kowalevskii
''Saccoglossus '' is a genus of acorn worm. It is the largest genus in the Enteropneusta class, with 20 species. This genus is characterized especially by the concentric rings of muscle fibers in the proboscis. Many ''Saccoglossus'' can be found in coastal mud and sand habitat, often near bay A bay is a recessed, coastal body of water that directly connects to a larger main body of water, such as an ocean, a lake, or another bay. A large bay is usually called a ''gulf'', ''sea'', ''sound'', or ''bight''. A ''cove'' is a small, ci ...s. They dig tubes in the substrate, ejecting conical piles of castings in a spiral fashion. Acorn worms of this genus are known for the production and accumulation of various halogenated phenols and pyrroles. Species The follow species are recognized in this genus: References Enteropneusta Taxa described in 1892 {{Hemichordate-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acorn Worm
The acorn worms or Enteropneusta are a hemichordate class of invertebrates consisting of one order of the same name. The closest non-hemichordate relatives of the Enteropneusta are the echinoderms. There are 111 known species of acorn worm in the world, the main species for research being '' Saccoglossus kowalevskii''. Two families— Harrimaniidae and Ptychoderidae—separated at least 370 million years ago. Until recently, it was thought that all species lived in the sediment on the seabed, subsisting as deposit feeders or suspension feeders. However, the early 21st century has seen the description of a new family, the Torquaratoridae, evidently limited to the deep sea, in which most of the species crawl on the surface of the ocean bottom and alternatively rise into the water column, evidently to drift to new foraging sites. It is assumed that the ancestors of acorn worms used to live in tubes like their relatives Pterobranchia, but that they eventually started to live a s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
