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Endoxocrinus Parrae
''Endoxocrinus parrae'' is a species of stalked crinoids of the family Isselicrinidae. It is the most commonly found isocrinine species in west Atlantic Ocean. Morphology As members of the order Isocrinida, ''E. parrae'' possess a heteromorphic stalk that is made of calcareous nodal columns. Their body is mostly made of porous ossicles, with minimal soft tissue connecting the calcareous structure. The stalks can measure 50.5 cm in some subspecies, but average between 10.2 cm and 23.5 cm. The stalks average between 4–5mm in diameter, and are connected to between 23 and 58 feeding arms that branch off radially around the mouth and anus. While some subspecies of ''E. parrae'' possess arms with a smooth dorsal surface, others have been shown to exhibit a serrated dorsal surface, while others have shown morphology that is between the two characteristics, not quiet smooth but not fully serrated. Cirri allow the crinoid to attach itself to the sediment and continue upwar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. However, only about 14% of these had been described by 2011. All species (except viruses) are given a two-part name, a "binomial". The first part of a binomial is the genus to which the species belongs. The second part is called the specific name or the specific epithet (in botanical nomenclature, also sometimes i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crinoids
Crinoids are marine animals that make up the class Crinoidea. Crinoids that are attached to the sea bottom by a stalk in their adult form are commonly called sea lilies, while the unstalked forms are called feather stars or comatulids, which are members of the largest crinoid order, Comatulida. Crinoids are echinoderms in the phylum Echinodermata, which also includes the starfish, brittle stars, sea urchins and sea cucumbers. They live in both shallow water and in depths as great as . Adult crinoids are characterised by having the mouth located on the upper surface. This is surrounded by feeding arms, and is linked to a U-shaped gut, with the anus being located on the oral disc near the mouth. Although the basic echinoderm pattern of fivefold symmetry can be recognised, in most crinoids the five arms are subdivided into ten or more. These have feathery pinnules and are spread wide to gather planktonic particles from the water. At some stage in their lives, most crinoids have a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Family (biology)
Family ( la, familia, plural ') is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks between the ranks of family and genus. The official family names are Latin in origin; however, popular names are often used: for example, walnut trees and hickory trees belong to the family Juglandaceae, but that family is commonly referred to as the "walnut family". What belongs to a family—or if a described family should be recognized at all—are proposed and determined by practicing taxonomists. There are no hard rules for describing or recognizing a family, but in plants, they can be characterized on the basis of both vegetative and reproductive features of plant species. Taxonomists often take different positions about descriptions, and there may be no broad consensus across the scientific community for some time. The publishing of new data and opini ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isselicrinidae
Isselicrinidae is one of four extant families of crinoids in the order Isocrinida. Subfamilies and genera * subfamily Diplocrininae Roux, 1981 ** genus ''Cenocrinus'' Thomson, 1864 -- 1 species ** genus ''Endoxocrinus'' AH Clark, 1908 -- 5 species * subfamily Metacrininae Klikushkin, 1977 ** genus ''Metacrinus'' Carpenter, 1882 -- 9 species ** genus '' Saracrinus'' AH Clark, 1923 -- 3 or 4 species Image:Endoxocrinus parrae.jpg, ''Endoxocrinus parrae'' Image:Endoxocrinus.jpg, ''Endoxocrinus sp.'' Image:Metacrinus rotundus by OpenCage.JPG, ''Metacrinus rotundus'' Image:Cenocrinus asterius (Linnaeus, 1767).jpg, ''Cenocrinus asterius'' Image:Endoxocrinus (Diplocrinus) wyvillethomsoni.jpg, ''Endoxocrinus wyvillethomsoni'' Image:Image from page 221 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14598372209).jpg, ''Metacrinus interruptus ''Metacrinus'' is a genus of stalked crinoids in the family Isselicrinidae. Members ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atlantic Ocean
The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe and Asia from the "New World" of the Americas in the European perception of the World. The Atlantic Ocean occupies an elongated, S-shaped basin extending longitudinally between Europe and Africa to the east, and North and South America to the west. As one component of the interconnected World Ocean, it is connected in the north to the Arctic Ocean, to the Pacific Ocean in the southwest, the Indian Ocean in the southeast, and the Southern Ocean in the south (other definitions describe the Atlantic as extending southward to Antarctica). The Atlantic Ocean is divided in two parts, by the Equatorial Counter Current, with the North(ern) Atlantic Ocean and the South(ern) Atlantic Ocean split at about 8°N. Scientific explorations of the A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isocrinida
Isocrinida is an order of sea lilies which contains four extant families. Characteristics Members of this order are characterised by having a "heteromorphic" stalk; the stalk consists of a series of nodes with cirri, interspersed by several nodes without cirri. There are additionally a whorl of cirri at the base on which the animal perches. The calyx is a shallow cup consisting of five basals and five radials. Families * Suborder Isocrinina Sieverts-Doreck, 1952 ** family Cainocrinidae Simms, 1988 -- 1 genus (1 species) ** family Isocrinidae Gislén, 1924 -- 3 genus (3 species) ** family Isselicrinidae Klikushkin, 1977 -- 4 genus (18 species) ** family Proisocrinidae Rasmussen, 1978 -- 1 genus (1 species) * Suborder Pentacrinitina Gray, 1842 † ** family Pentacrinitidae Gray, 1842 † Image:Neocrinus decorus.jpg, ''Neocrinus decorus'' (Isocrinidae) Image:Metacrinus rotundus by OpenCage.JPG, ''Metacrinus rotundus'' (Isselicrinidae) Image:Proisocrinus ruberrimus.jpg, ''Proiso ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marine Snow
In the deep ocean, marine snow (also known as "ocean dandruff") is a continuous shower of mostly organic detritus falling from the upper layers of the water column. It is a significant means of exporting energy from the light-rich photic zone to the aphotic zone below, which is referred to as the biological pump. Export production is the amount of organic matter produced in the ocean by primary production that is not recycled ( remineralised) before it sinks into the aphotic zone. Because of the role of export production in the ocean's biological pump, it is typically measured in units of carbon (e.g. mg C m−2 d−1). The term was first coined by the explorer William Beebe as he observed it from his bathysphere. As the origin of marine snow lies in activities within the productive photic zone, the prevalence of marine snow changes with seasonal fluctuations in photosynthetic activity and ocean currents. Marine snow can be an important food source for organisms living in th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calocidaris Micans
''Calocidaris micans'' is a species of sea urchins of the family Cidaridae. Their armour is covered with spines. ''Calocidaris micans'' was first scientifically described in 1903 by Ole Mortensen.Kroh, A. (2010). ''Calocidaris micans'' (Mortensen, 1903). In: Kroh, A. & Mooi, R. (2010World Echinoidea Database at 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 specialist .... References Animals described in 1903 Cidaridae Taxa named by Ole Theodor Jensen Mortensen {{Echinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
