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Eulagisca
''Eulagisca'' is a genus of marine polychaete worms belonging to the family Polynoidae. The genus includes 5 species which are all found in the Southern and Antarctic Oceans and are notable for reaching a large size - 180 mm or more long - larger than any other species of Polynoidae.Pettibone, Marian H. 1997. Revision of the scaleworm genus ''Eulagisca'' McIntosh (Polychaeta: Polynoidae) with the erection of the subfamily Eulagiscinae and the new genus ''Pareulagisca''. Proceedings of the Biological Society of Washington, 110(4): 537–551 Description Species of ''Eulagisca'' have 35–41 segments and 15 pairs of elytra. The lateral antennae are undivided and inserted terminally on the prostomium . There is a distinctive dorsal fold ("nuchal flap" in the taxonomic literature) on segment 2, and unlike the related genus ''Pareulagisca'', in ''Eulagisca'' all notochaetae are stout and have blunt tips. Species Five species of ''Eulagisca'' are recognised as of August 2020: *' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eulagisca Gigantea
''Eulagisca gigantea'' is a scale worm that is widely distributed around Antarctica and the Southern Ocean at depths of about . Description ''Eulagisca gigantea'' can grow to a length of and a width of . It is dorso-ventrally flattened and has 40 segments with 15 pairs of elytra. The prostomium is oval and the back part is concealed by a nuchal fold. The lateral antennae are inserted terminally on the anterior margin of the prostomium. The notochaetae are about as thick as the neurochaetae, but bidentate neurochaetae absent. The eversible proboscis A proboscis () is an elongated appendage from the head of an animal, either a vertebrate or an invertebrate. In invertebrates, the term usually refers to tubular mouthparts used for feeding and sucking. In vertebrates, a proboscis is an elong ... bears a pair of large jaws and is about a quarter of the length of the whole organism. It is a greyish-brown colour and without patterning. References Further reading * {{Taxo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eulagisca Uschakovi
''Eulagisca uschakovi'' is a giant scale worm known from the Antarctic, in waters such as off Mac.Robertson Land, Palmer Archipelago and the Weddell Sea, at depths of 10 to 920m. Description Specimens can grow to up to around 190mm in length and have 39 segments with 15 pairs of elytra. The body is brownish at the mid-dorsum. The elytra are large and thin, with brownish splashes of pigmentation and fringe of sharp, pointed papillae along their margin. Wide, ovular prostomium with the median antenna with a large ceratophore in an anterior notch and lateral antennae inserted terminally on anterior margin of prostomium. Notochaetae are capillary-type and thicker than the capillary Neurochaetae A chaeta or cheta (from Greek χαίτη “crest, mane, flowing hair"; plural: chaetae) is a chitinous bristle or seta found in annelid worms, (although the term is also frequently used to describe similar structures in other invertebrates such .... References {{Taxonbar, from=Q310 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eulagisca Macnabi
''Eulagisca macnabi'' is a scale worm that occurs in the Antarctic Ocean, the Amundsen Sea and off the South Orkney Islands The South Orkney Islands are a group of islands in the Southern Ocean, about north-east of the tip of the Antarctic PeninsulaPettibone, Marian H. 1997. Revision of the scaleworm genus Eulagisca McIntosh (Polychaeta: Polynoidae) with the erection of the subfamily Eulagiscinae and the new genus Pareulagisca. Proceedings of the Biological Society of Washington, 110(4): 537–551. Description ''Eulagisa macnabi'' most likely has 15 pairs of elytra that have a marginal fringe of papillae. It is brown-pigmented, especially on bases of[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eulagisca Corrientis
''Eulagisca corrientis'' is a scale worm known from the subantarctic Heard Island and Kerguelen Island and the Ross Sea in Antarctica, at depths of about 200–1000m.McIntosh, William C. s M'Intosh (1885). Report on the Annelida Polychaeta collected by H.M.S. Challenger during the years 1873-1876. Report on the Scientific Results of the Voyage of H.M.S. Challenger during the years 1873–76. Zoology. 12 (part 34): i-xxxvi, 1-554, pl. 1-55, 1A-39A, & Annelida stations map., available online at https://biodiversitylibrary.org/page/50688426 Description ''Eulagisa corrientis'' has 38 segments and 15 pairs of elytra. The lateral antennae are inserted terminally on anterior margin of the prostomium. The elytra bear a marginal fringe of papillae and the notochaetae are distinctly thicker than the neurochaetae, with bidentate neurochaetae also present. References Phyllodocida {{Annelid-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polynoidae
Polynoidae is a family of marine Polychaete worms known as "scale worms" due to the scale-like elytra on the dorsal surface. Almost 900 species are currently recognised belonging to 9 subfamilies and 167 genera. They are active hunters, but generally dwell in protected environments such as under stones. The group is widely distributed from shallow intertidal waters to hadal trenches. They are the most diverse group of polychaetes in terms of genus number and second most diverse in terms of species number which is almost 8% of all segmented worm species. Description Most Polynoidae species are short and flattened, but can reach as much as 20 cm in length and 10 cm width in ''Eulagisca gigantea'' and ''Eulagisca uschakovi''. Individuals are usually covered almost entirely by elytra, which can be shed and regenerated in many species. The elytra of some species are faintly bioluminescent, and leave glowing traces around the mouthparts of their predators, making those preda ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eulagisca Puschkini
''Eulagisca puschkini'' is a scale worm that is only known from a single specimen collected at a depth of 32m by a SCUBA diver in the Ross Sea.Averincev, V. G. (1972). Benthic polychaetes Errantia from the Antarctic and Subantarctic collected by the Soviet Antarctic Expedition]. Issledovaniya fauny morei. Zoologicheskii Institut Akademii Nauk USSR. 11(19): 88–292 iological Results of the Soviet Antarctic Expeditions, 5 Description ''Eulagisa puschkini'' has 40 segments and 15 pairs of elytra, and has a brownish pigment (though the patterning is not clear). Lateral antennae are inserted terminally on the anterior margin of the prostomium. Notochaetae are distinctly thicker than neurochaetae, and bidentate neurochaetae are present. References {{Taxonbar, from=Q2643108 Phyllodocida ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Museums Victoria
Museums Victoria is an organisation which operates three major state-owned museums in Melbourne, Victoria: the Melbourne Museum, the Immigration Museum and Scienceworks Museum. It also manages the Royal Exhibition Building and a storage facility in Melbourne's City of Moreland. History The museum traces its history back to the establishment of the "Museum of Natural and Economic Geology" by the Government of Victoria, William Blandowski and others in 1854. The Library, Museums and National Gallery Act 1869 incorporated the Museums with the Public Library and the National Gallery of Victoria; but this administrative connection was severed in 1944 when the Public Library, National Gallery and Museums Act came into force, and they became four separate institutions once again. Museums Victoria was founded in its current form under the Australian Museums Act (1983). Currently, Museums Victoria's State Collections holds over 17 million items, including objects relating to In ... [...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] |
Polychaete
Polychaeta () is a paraphyletic class (biology), class of generally marine invertebrate, marine annelid worms, common name, 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 Alitta virens, sandworm or Alitta succinea, 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 (underwater vehicle), ''Nereus'' at the bottom of the Challenger Deep, the deepes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elytron (Annelida)
In annelids, elytra (; from Greek Greek may refer to: Greece Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group. *Greek language, a branch of the Indo-European language family. **Proto-Greek language, the assumed last common ancestor ... ἔλυτρον "sheath, cover"; singular: elytron ) are shield-like scales that are attached dorsally, one pair on each of a number of alternating segments and entirely or partly cover the dorsum. Elytra are modified dorsal cirri, and their number, size, location, and ornamentation are important taxonomic characters. The basal part of the elytra is known as the elytrophore; if (as is often the case) elytra are lost their presence is indicated by the elytrophore which is still present and visible. Annelids possessing elytra are also known as "scale worms". Possession of elytra is characteristic of the annelid suborder Aphroditiformia. Gallery File:Eunoe leiotentaculata lower res.jpg, A '' Eunoe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chaeta
A chaeta or cheta (from Greek χαίτη “crest, mane, flowing hair"; plural: chaetae) is a chitinous bristle or seta found in annelid worms, (although the term is also frequently used to describe similar structures in other invertebrates such as arthropods). Polychaete annelids, ('polychaeta' literally meaning "many bristles") are named for their chaetae. In Polychaeta, chaetae are found as bundles on the parapodia, paired appendages on the side of the body. The chaetae are epidermal extracellular structures, and clearly visible in most polychaetes. They are probably the best studied structures in these animals. Use in taxonomy and identification The ultrastructure of chaetae is fundamentally similar for all taxa but there is vast diversity in chaetal morphology. Moreover, chaetae bear precise characters for determination of species and taxonomic assessment. The shape, absolute and relative size, number, position, ornamentation and type are important taxonomic characters a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
