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Ophionereididae
Ophionereididae are a family of brittle stars. Systematics Ophionereididae has been placed (along with Ophiocomidae) to the Taxonomic rank, superfamily Ophiocomidea and infraorder Chilophiurina or suborder Chilophiurina in different classifications. Ophionereididae contains the following genera: *''Ophiocrasis'' *''Ophiodoris'' *''Ophionereis'' *''Ophioneroides'' *''Ophiotriton'' References Ophionereididae, Ophiurida Echinoderm families {{Ophiuroidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ophionereididae
Ophionereididae are a family of brittle stars. Systematics Ophionereididae has been placed (along with Ophiocomidae) to the Taxonomic rank, superfamily Ophiocomidea and infraorder Chilophiurina or suborder Chilophiurina in different classifications. Ophionereididae contains the following genera: *''Ophiocrasis'' *''Ophiodoris'' *''Ophionereis'' *''Ophioneroides'' *''Ophiotriton'' References Ophionereididae, Ophiurida Echinoderm families {{Ophiuroidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brittle Star
Brittle stars, serpent stars, or ophiuroids (; ; referring to the serpent-like arms of the brittle star) are echinoderms in the class Ophiuroidea, closely related to starfish. They crawl across the sea floor using their flexible arms for locomotion. The ophiuroids generally have five long, slender, whip-like arms which may reach up to in length on the largest specimens. The Ophiuroidea contain two large clades, Ophiurida (brittle stars) and Euryalida (basket stars). Over 2,000 species of brittle stars live today. More than 1,200 of these species are found in deep waters, greater than 200 m deep. Range The ophiuroids diverged in the Early Ordovician, about 500 million years ago. Ophiuroids can be found today in all of the major marine provinces, from the poles to the tropics. Basket stars are usually confined to the deeper parts of this range; Ophiuroids are known even from abyssal (>6,000 m) depths. However, brittle stars are also common members of reef communities, where t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ophionereis
''Ophionereis'' is a genus of echinoderms belonging to the family Ophionereididae. The genus has almost cosmopolitan distribution. Species: *'' Ophionereis albomaculata'' *'' Ophionereis amphilogus'' *'' Ophionereis andamanensis'' *'' Ophionereis annulata'' *'' Ophionereis australis'' *'' Ophionereis commutabilis'' *'' Ophionereis degeneri'' *'' Ophionereis diabloensis'' *'' Ophionereis dolabriformis'' *'' Ophionereis dubia'' *'' Ophionereis eurybrachiplax'' *'' Ophionereis fasciata'' *'' Ophionereis fusca'' *'' Ophionereis hexactis'' *'' Ophionereis intermedia'' *'' Ophionereis lineata'' *'' Ophionereis novaezelandiae'' *'' Ophionereis olivacea'' *'' Ophionereis perplexa'' *'' Ophionereis porrecta'' *''Ophionereis reticulata ''Ophionereis reticulata'', the reticulated brittle star, is a brittle star in the family Ophionereididae. It is found in shallow parts of the western Atlantic, Caribbean Sea and Gulf of Mexico. Description Like other brittle stars, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ophionereis Reticulata
''Ophionereis reticulata'', the reticulated brittle star, is a brittle star in the family Ophionereididae. It is found in shallow parts of the western Atlantic, Caribbean Sea and Gulf of Mexico. Description Like other brittle stars, ''Ophionereis reticulata'' has a small flattened, pentagonal disc and five narrow, elongated arms. The disc can grow to a diameter of and the arms to a length of . The aboral (upper) surface of the disc is covered with small plates and is pale grey with a network of fine reddish-brown lines, giving it its common name. The arms have a large number of short joints and are fringed on either side with short spines. They are white or pale grey and have a band of chocolate brown approximately every fourth joint. This colouration makes the brittle star inconspicuous when viewed against its typical background. Distribution and habitat ''Ophionereis reticulata'' is found in the western Atlantic Ocean, the Caribbean Sea and the Gulf of Mexico. Its range extend ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ophiuroidea
Brittle stars, serpent stars, or ophiuroids (; ; referring to the serpent-like arms of the brittle star) are echinoderms in the class Ophiuroidea, closely related to starfish. They crawl across the sea floor using their flexible arms for locomotion. The ophiuroids generally have five long, slender, whip-like arms which may reach up to in length on the largest specimens. The Ophiuroidea contain two large clades, Ophiurida (brittle stars) and Euryalida (basket stars). Over 2,000 species of brittle stars live today. More than 1,200 of these species are found in deep waters, greater than 200 m deep. Range The ophiuroids diverged in the Early Ordovician, about 500 million years ago. Ophiuroids can be found today in all of the major marine provinces, from the poles to the tropics. Basket stars are usually confined to the deeper parts of this range; Ophiuroids are known even from abyssal (>6,000 m) depths. However, brittle stars are also common members of reef communities, where the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ophiurina
Ophiurina are a suborder of brittle stars containing the majority of living brittle star species. Systematics There is currently no consensus as to the subdivision of the Ophiurina (traditionally, the infraorders have been treated as suborders). It contains the genera Amphiura, Amphipholis, and Ophiacantha. The suborder has been divided into the following recent infraorders and families :Smith, A.B.; Paterson, G.L.J., Ophiuroid phylogeny and higher taxonomy: morphological, molecular and palaeontological perspectives. Zool. J. Linn. Soc. 114 (1995) * Ophiacanthidae Hemieuryalina * Hemieuryalidae Chilophiurina * Ophiuridae Gnathophiurina * Amphilepididae * Amphiuridae * Ophiothricidae * Ophiactidae *Ophionereididae *Ophiocomidae Ophiocomidae are a family of brittle stars of the suborder Ophiurina. Systematics and phylogeny Ophiocomidae has been placed (along with Ophionereididae) to the superfamily Ophiocomidea and infraorder Order ( la, ordo) is one of the eigh ... ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ophiocomidae
Ophiocomidae are a family of brittle stars of the suborder Ophiurina. Systematics and phylogeny Ophiocomidae has been placed (along with Ophionereididae) to the superfamily Ophiocomidea and infraorder Gnathophiurina or suborder Gnathophiurina in different classifications. Genera The following genera Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclat ... are included in the family according to the World Register of Marine Species (WoRMS): World Register of Marine Species. Retrieved 2011-08-30. * Subfamily Ophiocominae **Genus '' [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ophiurida
The Ophiurida are an order of echinoderms within the class Ophiuroidea. It includes the vast majority of living brittle stars. Characteristics Ophiurida have bursae for respiration and excretion, and dorsal and ventral arm shields are present and usually well developed. Arms are unbranched and incapable of coiling vertically. Most are five-armed, some with 4 or 6 arms as an abnormality, but others properly bear six or seven arms. The madreporite is on the oral surface. The digestive glands are entirely within the central disc. They move their arms side to side by means of ball-and-socket joints. Tropical species tend to contrast color from the environment, but most others prefer to blend in. These biochromes do not include echinochromes. Systematics and phylogeny There is currently no consensus as to the subdivision of the Ophiurida. The order has been divided into the following suborders and infraorders * Ophiomyxina * Ophiurina ** Hemieuryalina ** Chilophiurina ** Gna ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eleutherozoa
Eleutherozoa is a proposed subphylum of echinoderms. They are mobile animals with the mouth directed towards the substrate. They usually have a madreporite, tube feet, and moveable spines of some sort, and some have Tiedemann's bodies on the ring canal. All living echinoderms except Crinozoa and Blastozoa belong here. Systematics There are 2 main competing hypotheses about the internal subdivision, both about equally well supported by both molecular and morphological data. They differ in their placement of the Ophiuroidea (brittle stars), and are named accordingly. The "Cryptosyringida" hypothesis posits that the "sea-star" morphology is plesiomorphic for Eleutherozoa as a whole, and that starfish (Asteroidea) and brittle stars are not very closely related, the latter forming the clade Cryptosyringida together with the Echinozoa. The "Asterozoa" hypothesis, on the other hand, implies that the "sea-star" arms of starfish and brittle stars, as well as the rounded shape of Echinoz ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animalia
Animals are multicellular, eukaryotic organisms in the biological kingdom Animalia. With few exceptions, animals consume organic material, breathe oxygen, are able to move, can reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of cells, the blastula, during embryonic development. Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from to . They have complex interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology. Most living animal species are in Bilateria, a clade whose members have a bilaterally symmetric body plan. The Bilateria include the protostomes, containing animals such as nematodes, arthropods, flatworms, annelids and molluscs, and the deuterostomes, containing the echinode ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Infraorder
Order ( la, ordo) is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between family and class. In biological classification, the order is a taxonomic rank used in the classification of organisms and recognized by the nomenclature codes. An immediately higher rank, superorder, is sometimes added directly above order, with suborder directly beneath order. An order can also be defined as a group of related families. What does and does not belong to each order is determined by a taxonomist, as is whether a particular order should be recognized at all. Often there is no exact agreement, with different taxonomists each taking a different position. There are no hard rules that a taxonomist needs to follow in describing or recognizing an order. Some taxa are accepted almost universally, while others are recognized only rarely. The name of an order is usually written with a capital letter. For some groups of organisms, their orders may follow ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
