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Stereobalanus
''Stereobalanus'' is a genus of acorn worms belonging to the family Harrimaniidae Harrimaniidae is a basal family of acorn worms. A taxonomic revision was undertaken in 2010, and a number of new genera and species found in the Eastern Pacific were described. In this family the development is direct without tornaria larva, and .... The species of this genus are found in Europe and Northern America. Species: *'' Stereobalanus canadensis'' *'' Stereobalanus willeyi'' References {{Taxonbar, from=Q3824273 Enteropneusta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stereobalanus Canadensis
''Stereobalanus'' is a genus of acorn worms belonging to the family Harrimaniidae Harrimaniidae is a basal family of acorn worms. A taxonomic revision was undertaken in 2010, and a number of new genera and species found in the Eastern Pacific were described. In this family the development is direct without tornaria larva, and .... The species of this genus are found in Europe and Northern America. Species: *'' Stereobalanus canadensis'' *'' Stereobalanus willeyi'' References {{Taxonbar, from=Q3824273 Enteropneusta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harrimaniidae
Harrimaniidae is a basal family of acorn worms. A taxonomic revision was undertaken in 2010, and a number of new genera and species found in the Eastern Pacific were described. In this family the development is direct without tornaria larva, and circular muscle fibers in their trunk is missing. There is some indication that Stereobalanus may be a separate basal acorn worm lineage, sister to all remaining acorn worms. Species The following genera and species are listed in the World Register of Marine Species: . Retrieved October 17, 2011. *'' Harrimania [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stereobalanus Willeyi
''Stereobalanus'' is a genus of acorn worms belonging to the family Harrimaniidae. The species of this genus are found in Europe and Northern America. Species: *''Stereobalanus canadensis ''Stereobalanus'' is a genus of acorn worms belonging to the family Harrimaniidae Harrimaniidae is a basal family of acorn worms. A taxonomic revision was undertaken in 2010, and a number of new genera and species found in the Eastern Pacific ...'' *'' Stereobalanus willeyi'' References {{Taxonbar, from=Q3824273 Enteropneusta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acorn Worms
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 safer an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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