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Echiura
The Echiura, or spoon worms, are a small group of marine animals. Once treated as a separate phylum, they are now considered to belong to Annelida. Annelids typically have their bodies divided into segments, but echiurans have secondarily lost their segmentation. The majority of echiurans live in burrows in soft sediment in shallow water, but some live in rock crevices or under boulders, and there are also deep sea forms. More than 230 species have been described. Spoon worms are cylindrical, soft-bodied animals usually possessing a non-retractable proboscis which can be rolled into a scoop-shape to feed. In some species the proboscis is ribbon-like, longer than the trunk and may have a forked tip. Spoon worms vary in size from less than a centimetre in length to more than a metre. Most are deposit feeders, collecting detritus from the sea floor. Fossils of these worms are seldom found and the earliest known fossil specimen is from the Upper Carboniferous ( Pennsylvanian). T ... [...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 polychae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urechis Caupo
''Urechis caupo'' is a species of spoon worm in the family Urechidae, commonly known as the innkeeper echiuran, the fat innkeeper worm (because the tunnels often contain other animals), the innkeeper worm, or the penis fish. It is found in shallow water on the west coast of North America, between southern Oregon and Baja California, where it forms a U-shaped burrow in the sediment and feeds on plankton using a mucus net. Description ''Urechis caupo'' is a plump, unsegmented, cylindrical pink worm growing to a length of up to , with being a more typical length. There are a pair of setae (bristles) on the ventral surface at the anterior end, and a distinctive ring of about ten setae around the anus at the posterior end. The proboscis is short. Distribution and habitat Shallow water in the northeastern Pacific Ocean is the habitat of ''U. caupo''; its range extends from southern Oregon to northern Baja California. It lives in a burrow in muddy sand in the lower intertidal and th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urechidae
Urechidae (commonly known as "fat innkeeper" or "penis fish") is a family of spoonworms in the subclass Echiura. The only genus in the family is ''Urechis'', which has four species. Species The World Register of Marine Species The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive list of names of marine organisms. Content The content of the registry is edited and maintained by scientific specialis ... includes these species in this genus:- *'' Urechis caupo'' Fisher & MacGinitie, 1928 *'' Urechis chilensis'' (M. Müller, 1852) *'' Urechis novaezealandiae'' ( Dendy, 1898) *'' Urechis unicinctus'' ( Drasche, 1880) References {{Taxonbar, from1=Q11848917, from2=Q2806041 Echiurans Annelid families ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bonelliidae
Bonelliidae is a family of marine worms (Class Echiura, phylum Annelida) noted for being sexually dimorphic, with males being tiny in comparison with the females. They occupy burrows in the seabed in many parts of the world's oceans, often at great depths. Characteristics Members of the class Echiura are plump, unsegmented worms, commonly known as spoonworms. The mouth is at the anterior end of the trunk and a flattened proboscis extends forward in front of the mouth. The ventral side of the proboscis has a ciliated channel along which food particles and mucus are moved towards the mouth. Close behind the mouth are two hooked chaetae and one or two nephridial pores. The gut is much longer than the body and is folded and coiled inside the coelom (body cavity). The anus is at the posterior end of the body and two anal vesicles with ciliated funnels open into the cloaca. In the family Bonelliidae, the females are very much larger than the dwarf males, and in most, if not all, in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ikedidae
Ikedidae is a family of spoon worms in the suborder Bonelliida. It is a monotypic family, the only genus being ''Ikeda''. These worms burrow into soft sediment on the seabed. Examination of the original material of '' Ikeda taenoides'' by Teruaki Nishikawa in 2002 showed that the longitudinal muscle layer lay between the circular layer and the oblique layer, as in all other echiurans, throwing the validity of the family Ikedidae into doubt. Nishikawa advocates that the family be regarded as a junior synonym of Echiuridae. Species The World Register of Marine Species recognises the following species in the genus:- *'' Ikeda pirotansis'' ( Menon & DattaGupta, 1962) *''Ikeda taenioides'' (Ikeda Ikeda may refer to: * Ikeda (surname), a Japanese surname * Ikeda (comics), a character in ''Usagi Yojimbo'' * Ikeda clan, a Japanese clan * Ikeda map, chaotic attractor * ''Ikeda'' (annelid) a genus of the family Ikedidae Places * Ikeda, Osaka i ..., 1904) References {{Taxonbar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echiurus Echiurus
''Echiurus echiurus'' is a species of spoon worm in the family Echiuridae. It is found in the North Atlantic Ocean and a subspecies is found in Alaska. It burrows into soft sediment and under boulders and stones in muddy places. Description This spoon worm has a roughly cylindrical trunk between long. At the anterior end of the trunk, just beside the mouth, a scoop-shaped proboscis about long extends forward. The trunk has about 22 rings of papillae, a ring of larger papillae alternating with several rings of smaller papillae. A pair of hooked chaetae (chitinous bristles) is borne just behind the mouth on the underside of the worm and there are two rings of chaetae on the posterior end of the trunk, near the anus. Internally, the rectum is partially obscured by two long anal diverticula with ciliated funnels. Externally, the trunk is greyish-brown while the proboscis is orange with brownish streaks. Distribution ''Echiurus echiurus'' has a holarctic distribution, extending ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gephyrea
Gephyrea is a now-dismantled taxon for a group of non-annulated worms, considered intermediate between annelids and holothurians, containing the three modern phyla Echiura, Sipuncula The Sipuncula or Sipunculida (common names sipunculid worms or peanut worms) is a class containing about 162 species of unsegmented marine annelid worms. The name ''Sipuncula'' is from the genus name '' Sipunculus'', and comes from the Latin ..., and Priapulida. References Obsolete animal taxa Protostome classes {{protostome-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echiuridae
Echiuridae is a family of spoon worms in the suborder Echiurida. It is a monotypic family, the only genus being ''Echiurus''. These worms burrow into soft sediment on the seabed. Species The World Register of Marine Species recognises the following species in the genus:- * ''Echiurus abyssalis'' Skorikow, 1906 * ''Echiurus antarcticus'' Spengel, 1912 * '' Echiurus echiurus'' (Pallas, 1766) * ''Echiurus sitchaensis Echiuridae is a family of spoon worms in the suborder Echiurida. It is a monotypic family, the only genus being ''Echiurus''. These worms burrow into soft sediment on the seabed. Species The World Register of Marine Species recognises the ...'' Brandt, 1835 References {{Taxonbar, from=Q2809389 Echiurans ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echiurida
Echiurida is a suborder of the order Echiuroidea, an order of polychaete worms. Families The following families are classified within the suborder: *Echiuridae Quatrefages, 1847 *Thalassematidae Forbes & Goodsir, 1841 *Urechidae Urechidae (commonly known as "fat innkeeper" or "penis fish") is a family of spoonworms in the subclass Echiura. The only genus in the family is ''Urechis'', which has four species. Species The World Register of Marine Species The World Regi ... Monro, 1927 References {{Taxonbar, from=Q18668416 Echiurans ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thalassematidae
Thalassematidae is a family of spoonworms in the suborder Echiurida. Genera The World Register of Marine Species includes these genera in this family:- *'' Anelassorhynchus'' Annandale, 1922 *'' Arhynchite'' Satô, 1937 *'' Ikedosoma'' Bock, 1942 *'' Lissomyema'' Fisher, 1946 *'' Listriolobus'' Fischer, 1926 *'' Ochetostoma'' Rüppell & Leuckart, 1828 *''Thalassema Thalassema is a genus of spoonworms in the subclass Echiura. Species The World Register of Marine Species includes these species in this genus:- * '' Thalassema antarcticum'' Stephen, 1941 * '' Thalassema arcassonense'' Cuénot, 1902 * '' Th ...'' Pallas, 1774 References {{Taxonbar, from=Q43641001 Echiurans ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bonelliida
Bonelliida is a suborder of the order Echiuroidea, an order of polychaete worms. Families The following families are classified within the suborder: * Bonelliidae Lacaze-Duthiers, 1858 * Ikedidae Bock Bock is a strong beer in Germany, usually a dark lager. Several substyles exist, including: *Doppelbock (''Double Bock''), a stronger and maltier version *Eisbock (''Ice Bock''), a much stronger version made by partially freezing the beer and ..., 1942 References {{Taxonbar, from=Q10432880 Echiurans ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Priapulida
Priapulida (priapulid worms, from Gr. πριάπος, ''priāpos'' 'Priapus' + Lat. ''-ul-'', diminutive), sometimes referred to as penis worms, is a phylum of unsegmented marine worms. The name of the phylum relates to the Greek god of fertility, because their general shape and their extensible spiny introvert (eversible) proboscis may resemble the shape of a human penis. They live in the mud and in comparatively shallow waters up to deep. Some species show a remarkable tolerance for hydrogen sulfide and anoxia. They can be quite abundant in some areas. In an Alaskan bay as many as 85 adult individuals of ''Priapulus caudatus'' per square meter has been recorded, while the density of its larvae can be as high as 58,000 per square meter. Together with Echiura and Sipuncula, they were once placed in the taxon Gephyrea, but consistent morphological and molecular evidence supports their belonging to Ecdysozoa, which also includes arthropods and nematodes. Fossil findings show th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
