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Oligostracan
Oligostraca is a superclass (biology), superclass of crustaceans. It consists of the following classes: Class Derocheilocarididae, Mystacocarida: Minute crustaceans (0.5 to 1 mm in length) restricted to interstitial marine sediments. Locomotion depends completely on the presence of dorsal and ventral substrates. Class Ostracoda (seed shrimp): Small planktonic, demersal and benthic crustaceans with a cosmopolitan aquatic distribution in both freshwater and marine environments, and a few in damp terrestrial habitats. Often called seed shrimps because their body is enclosed within a small and bivalved (with one exception) carapace, which makes them look like seed. Class Ichthyostraca: :Subclass Argulidae, Branchiura (fish lice): Ectoparasitic crustaceans on marine and freshwater fish, ranging in size from a few millimeters to 30 mm. A carapace is covering most of their body, which is dorsoventrally flattened. They are able to switch hosts several times even as adults. :Subcla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Superclass (biology)
Superclass may refer to: * Superclass (book), a book about global governance by David Rothkopf and ''The Superclass List'' * Superclass (biology), a taxonomic rank intermediate between subphylum and class * Superclass (computer science), a class from which other classes are derived * Superclass (knowledge representation), a parent class See also * Subclass (other) {{Disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crustacean Taxonomy
Crustaceans (from Latin meaning: "those with shells" or "crusted ones") are invertebrate animals that constitute one group of arthropods that are traditionally a part of the subphylum Crustacea (), a large, diverse group of mainly aquatic arthropods including decapods (shrimps, prawns, crabs, lobsters and crayfish), seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, opossum shrimps, amphipods and mantis shrimp. The crustacean group can be treated as a subphylum under the clade Mandibulata. It is now well accepted that the hexapods (insects and entognathans) emerged deep in the Crustacean group, with the completed pan-group referred to as Pancrustacea. The three classes Cephalocarida, Branchiopoda and Remipedia are more closely related to the hexapods than they are to any of the other crustaceans (oligostracans and multicrustaceans). The 67,000 described species range in size from ''Stygotantulus, Stygotantulus stocki'' at , to the Japanese spid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taxa Described In 1997
In biology, a taxon (back-formation from ''taxonomy''; : taxa) is a group of one or more populations of an organism or organisms seen by taxonomists to form a unit. Although neither is required, a taxon is usually known by a particular name and given a particular ranking, especially if and when it is accepted or becomes established. It is very common, however, for taxonomists to remain at odds over what belongs to a taxon and the criteria used for inclusion, especially in the context of rank-based (" Linnaean") nomenclature (much less so under phylogenetic nomenclature). If a taxon is given a formal scientific name, its use is then governed by one of the nomenclature codes specifying which scientific name is correct for a particular grouping. Initial attempts at classifying and ordering organisms (plants and animals) were presumably set forth in prehistoric times by hunter-gatherers, as suggested by the fairly sophisticated folk taxonomies. Much later, Aristotle, and later still ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Skara (fossil)
''Skara'' is a genus of oligostracan pancrustaceans known from the Upper Cambrian Orsten deposit of Sweden, similarly aged deposits in China, and possibly Poland. It is the only genus in the order Skaracarida and family Skaraidae, and contains three species, ''S. anulata'', ''S. minuta'' and ''S. hunanensis''. Description ''Skara'' has a head with five segments which each contain an appendage pair; two pairs of antennae, a pair of mandibules and two pairs of maxillae. ''S. anulatas head shield resembles an inverted “U” in cross-section, and has been likened to an upside-down dinghy in shape, with a margin at its edge and slightly bulging rims. The forehead bears a rod-shaped process in ''S. minuta'' (however it is likely broken off in ''S. anulata''), with a tiny pore beneath likely representing a gland opening. The labrum is roughly nose-shaped, with shallow depressions near its posterior end likely representing interior muscles able to move the labrum abaxially. A tri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vermiform
Vermes (" vermin/vermes") is an obsolete taxon used by Carl Linnaeus and Jean-Baptiste Lamarck for non-arthropod invertebrate animals. Linnaeus In Linnaeus's ''Systema Naturae'', the Vermes had the rank of class, occupying the 6th (and last) slot of his animal systematics. It was divided into the following orders, all except the Lithophyta containing (in modern terms) organisms from a variety of phyla: * Intestina, including horsehair worms, earthworms, roundworms, liver flukes, leeches, hagfishes, and shipworms * Mollusca, including slugs, sea slugs, polychaetes, sea mice, priapulids, salps, jellyfish, starfish, and sea urchins * Testacea, including chitons, barnacles, clams, cockles, nautiluses, snails and serpulid worms * Lithophyta, including various corals * Zoophyta, including bryozoans, coralline algae, '' Hydra'', sea pens, tapeworms, and '' Volvox'' Apart from the Mollusca, understood very differently from the modern phylum of that name, Linnaeus includ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argulidae
The family Argulidae, whose members are commonly known as carp lice or fish lice, are parasitic crustaceans in the class Ichthyostraca. It is the only family in the monotypic subclass Branchiura and the order Arguloida, although a second family, Dipteropeltidae, has been proposed. Taxonomy Branchiurans were once thought to be copepods but are now recognised as a separate subclass in the superclass Oligostraca due to their distinct morphological characteristics.Alan P. Covich, ... D. Christopher Rogers, in Ecology and Classification of North American Freshwater Invertebrates (Third Edition), 2010 There are approximately 170 species in four genera recognised in the family Branchiura. The centres of diversity are the Afrotropical and Neotropical realms. Description Branchiurans have a flattened, oval body, which is almost entirely covered by a broad, oval carapace, four thoracic segments each with a pair of swimming legs, a pair of anterior compound eyes, and an unsegment ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ostracod
Ostracods, or ostracodes, are a Class (biology), class of the crustacean, Crustacea (class Ostracoda), sometimes known as seed shrimp. Some 33,000 species (only 13,000 of which are extant taxon, extant) have been identified,Brandão, S.N.; Antonietto, L.S; Nery, D.G.; Santos, S.G.; Karanovic, I. (2023). World Ostracoda Database. Accessed at https://www.marinespecies.org/ostracoda on 2023-09-12. grouped into 7 valid orders. They are small crustaceans, typically around in size, but varying from , the latter in the case of the marine ''Gigantocypris.'' The largest known freshwater species is ''Megalocypris princeps'', which reach 8 mm in length. In most cases, their bodies are flattened from side to side and protected by a bivalve-like valve or "shell" made of chitin, and often calcium carbonate. The family Entocytheridae and many planktonic forms do not have calcium carbonate. The hinge of the two valves is in the upper (dorsal) region of the body. Ostracods are grouped toget ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Derocheilocarididae
Derocheilocarididae is a family of marine crustaceans that form part of the meiobenthos. It is the only family in the monotypic order Mystacocaridida, and the monotypic subclass Mystacocarida. These mystacocarids are less than long, and live interstitially in the intertidal zones of sandy beaches. Taxonomy The taxonomy of the mystacocarids is extremely conservative, since all mystacocarids look superficially alike. , the 13 described species are divided between two genera, ''Derocheilocaris'' (eight species) and ''Ctenocheilocaris'' (five species). The first mystacocarids to be found were discovered on a beach in southern New England in 1939. Distribution Mystacocarids occur along the coasts of South and North America, southern Africa, and the western Mediterranean. The lack of records from other parts of the world is "almost certainly" due to a lack of appropriate sampling, rather than a true absence. Description Mystacocarids are tiny pigmentless crustaceans, less than long ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crustacean
Crustaceans (from Latin meaning: "those with shells" or "crusted ones") are invertebrate animals that constitute one group of arthropods that are traditionally a part of the subphylum Crustacea (), a large, diverse group of mainly aquatic arthropods including decapods (shrimps, prawns, crabs, lobsters and crayfish), seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, opossum shrimps, amphipods and mantis shrimp. The crustacean group can be treated as a subphylum under the clade Mandibulata. It is now well accepted that the hexapods (insects and entognathans) emerged deep in the Crustacean group, with the completed pan-group referred to as Pancrustacea. The three classes Cephalocarida, Branchiopoda and Remipedia are more closely related to the hexapods than they are to any of the other crustaceans ( oligostracans and multicrustaceans). The 67,000 described species range in size from '' Stygotantulus stocki'' at , to the Japanese ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Skaracarida
''Skara'' is a genus of oligostracan pancrustaceans known from the Upper Cambrian Orsten deposit of Sweden, similarly aged deposits in China, and possibly Poland. It is the only genus in the order Skaracarida and family Skaraidae, and contains three species, ''S. anulata'', ''S. minuta'' and ''S. hunanensis''. Description ''Skara'' has a head with five segments which each contain an appendage pair; two pairs of antennae, a pair of mandibules and two pairs of maxillae. ''S. anulatas head shield resembles an inverted “U” in cross-section, and has been likened to an upside-down dinghy in shape, with a margin at its edge and slightly bulging rims. The forehead bears a rod-shaped process in ''S. minuta'' (however it is likely broken off in ''S. anulata''), with a tiny pore beneath likely representing a gland opening. The labrum is roughly nose-shaped, with shallow depressions near its posterior end likely representing interior muscles able to move the labrum abaxially. A t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
