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Poecilochaetidae
Poecilochaetidae is a family of marine worms within the Polychaeta. It is a monotypic family containing the single genus '' Poecilochaetus''. Members of this family are benthic The benthic zone is the ecological region at the lowest level of a body of water such as an ocean, lake, or stream, including the sediment surface and some sub-surface layers. The name comes from ancient Greek, βένθος (bénthos), meaning "t ... worms that burrow into soft sediments. References {{Taxonbar, from=Q3887490 Annelid families Canalipalpata ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Poecilochaetus Serpens
''Poecilochaetus serpens'' is a species of marine polychaete worm in the family Poecilochaetidae. It is a Benthos, benthic worm that burrows into soft sediment. Taxonomy and habitat The British marine biologist Edgar Johnson Allen Species description, first described this worm in 1904, giving it the name ''Poecilochaetus serpens''. It was originally found buried in the sand of a beach near Plymouth, England, at extreme low water of a spring tide; the shore here consists of patches of ''Zostera'' seagrass separated by patches of bare sand, and the worm was only ever found in the bare sand areas, nor was it ever found in other habitats near Plymouth. The specific name was chosen because when they were swimming, both the worm and its planktonic larva were continually wriggling. Description This segmented worm is long and slender. For example, a worm with 110 segments was in length and in width, exclusive of appendages. The prostomium (head) has a single tentacle ventrally. Behind ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Poecilochaetus
''Poecilochaetus'' is a genus of marine worms within the Polychaeta. It is the only genus in the monotypic family Poecilochaetidae. Members of this genus are benthic worms that burrow into soft sediments. Species The World Register of Marine Species lists the following species:- *'' Poecilochaetus australis'' Nonato, 1963 *'' Poecilochaetus bermudensis'' Hartman, 1965 *'' Poecilochaetus bifurcatus'' Imajima, 1989 *'' Poecilochaetus clavatus'' Imajima, 1989 *'' Poecilochaetus elongatus'' Imajima, 1989 *'' Poecilochaetus exmouthensis'' Hartmann-Schröder, 1980 *'' Poecilochaetus fauchaldi'' Pilato & Cantone, 1976 *'' Poecilochaetus fulgoris'' Claparède in Ehlers, 1875 *'' Poecilochaetus gallardoi'' Pilato & Cantone, 1976 *'' Poecilochaetus granulatus'' Imajima, 1989 *'' Poecilochaetus hystricosus'' Mackie, 1990 *'' Poecilochaetus ishikariensis'' Imajima, 1989 *'' Poecilochaetus japonicus'' Kitamori, 1965 *'' Poecilochaetus johnsoni'' Hartman, 1939 *'' Poecilochaetus koshikiensis'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polychaeta
Polychaeta () is a paraphyletic class of generally marine annelid worms, commonly called bristle worms or polychaetes (). Each body segment has a pair of fleshy protrusions called parapodia that bear many bristles, called chaetae, which are made of chitin. More than 10,000 species are described in this class. Common representatives include the lugworm (''Arenicola marina'') and the sandworm or clam worm ''Alitta''. Polychaetes as a class are robust and widespread, with species that live in the coldest ocean temperatures of the abyssal plain, to forms which tolerate the extremely high temperatures near hydrothermal vents. Polychaetes occur throughout the Earth's oceans at all depths, from forms that live as plankton near the surface, to a 2- to 3-cm specimen (still unclassified) observed by the robot ocean probe ''Nereus'' at the bottom of the Challenger Deep, the deepest known spot in the Earth's oceans. Only 168 species (less than 2% of all polychaetes) are known from f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monotypic Taxon
In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispecific" or "monospecific" is sometimes preferred. In botanical nomenclature, a monotypic genus is a genus in the special case where a genus and a single species are simultaneously described. In contrast, an oligotypic taxon contains more than one but only a very few subordinate taxa. Examples Just as the term ''monotypic'' is used to describe a taxon including only one subdivision, the contained taxon can also be referred to as monotypic within the higher-level taxon, e.g. a genus monotypic within a family. Some examples of monotypic groups are: Plants * In the order Amborellales, there is only one family, Amborellaceae and there is only one genus, '' Amborella'', and in this genus there is only one species, namely ''Amborella trichopoda ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus comes above species and below family (taxonomy), family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. ''Panthera leo'' (lion) and ''Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomy (biology), taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Benthos
Benthos (), also known as benthon, is the community of organisms that live on, in, or near the bottom of a sea, river, lake, or stream, also known as the benthic zone.Benthos from the Census of Antarctic Marine Life website This community lives in or near marine or freshwater sedimentary environments, from s along the , out to the , and t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Annelid Families
The annelids (Annelida , from Latin ', "little ring"), also known as the segmented worms, are a large phylum, with over 22,000 extant species including ragworms, earthworms, and leeches. The species exist in and have adapted to various ecologies – some in marine environments as distinct as tidal zones and hydrothermal vents, others in fresh water, and yet others in moist terrestrial environments. The Annelids are bilaterally symmetrical, triploblastic, coelomate, invertebrate organisms. They also have parapodia for locomotion. Most textbooks still use the traditional division into polychaetes (almost all marine), oligochaetes (which include earthworms) and leech-like species. Cladistic research since 1997 has radically changed this scheme, viewing leeches as a sub-group of oligochaetes and oligochaetes as a sub-group of polychaetes. In addition, the Pogonophora, Echiura and Sipuncula, previously regarded as separate phyla, are now regarded as sub-groups of polycha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
