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Haplotaxid
The Haplotaxida are one of two order (biology), orders within the annelid Class (biology), subclass Oligochaeta, the other being the Lumbriculida. No real common name exists, but they are simply referred to as haplotaxids. Given that the other clitellatan annelids are embedded between and around the Haplotaxida and Lumbriculida, the traditional ''Oligochaeta'' are a paraphyletic assemblage. Thus, the Haplotaxida might eventually be up-ranked to Class (biology), subclass status within the ''Clitellata'' or an expanded Oligochaeta, with the present suborders advancing to order rank. The latter – though without merging the ''Oligochaeta'' and ''Clitellata'' – has been proposed time and again in the past, most prominently for the distinct ''Moniligastrina.'' Families Of the four suborders of Haplotaxida, two are minor lineages, monotypic at family (biology), family level. Another one, the Tubificina, is sizeable and contains the aquatic Worm, worms, while the fourth, the earthwo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tubificidae
The Naididae (including the former family Tubificidae) are a family of clitellate oligochaete worms like the sludge worm, ''Tubifex tubifex''. They are key components of the benthic communities of many freshwater and marine ecosystems. In freshwater aquaria they may be referred to as detritus worms. Description These worms can vary in size, from centimeters to millimeters, depending on the subfamily. They are all hermaphroditic and lack a larval stage. Taxonomy Analysis of 18S rDNA sequences revealed that the tradition family Tubificidae is not monophyletic, with the traditionally circumscribed Naididae nested within tubidicid taxa. To avoid paraphyly the naidid and tubificid taxa were included in a combined family, which took the name Naididae because it has priority under ''International Code of Zoological Nomenclature'' rules as the senior synonym of Tubificidae. A proposal to the International Commission on Zoological Nomenclature to suppress Naididae, because the "tubifici ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Olavius Algarvensis
''Olavius algarvensis'' is a species of gutless oligochaete worm in the family Tubificidae which depends on symbiotic bacteria for its nutrition. Habitats and research ''Olavius algarvensis'' lives in coastal sediments in the Mediterranean. It was first described from the Algarve Coast of Portugal, but has also been found elsewhere, e.g. off the Italian island Elba, where it co-occurs with another species, '' O. ilvae.'' It was the first species of ''Olavius'' described from the East Atlantic coast; previously the genus was only known from the Caribbean. Description ''Olavius algarvensis'' is 12–25 mm long, about 0.25 mm wide, and has between 100 and 150 segments. Like all other species in the genus ''Olavius'', this species has no digestive tract. Instead, the body cavity contains the ventral nerve cord (inside a muscular sheath) and two blood vessels which are surrounded by a "fluffy" layer of chloragocytic cells. They are distinguished from other species of ''Ol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phreodrilidae
Phreodrilidae is a family of annelids belonging to the order Haplotaxida The Haplotaxida are one of two orders within the annelid subclass Oligochaeta, the other being the Lumbriculida. No real common name exists, but they are simply referred to as haplotaxids. Given that the other clitellatan annelids are embedd .... Genera Genera: * '' Antarctodrilus'' Brinkhurst, 1965 * '' Astacopsidrilus'' Goddard, 1909 References {{Taxonbar, from=Q5166111 Haplotaxida ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Annelid
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] |
