|
Disasterina Abnormalis
''Disasterina'' is a genus of sea stars of the family (biology), family Asterinidae. The genus occurs in the Indian and western Pacific Oceans. Description and characteristics ''Disasterina'' are sea stars with five or rarely six rays (arms). The rays have wide bases and are well-defined. The body is thin. ''Disasterina'' range from small (''Disasterina spinosa, D. spinosa'': radius ) to medium in size (''Disasterina abnormalis, D. abnormalis'': radius . Reproduction through Fragmentation (reproduction), fissiparity is not known to occur. ''Disasterina longispina, D. longispina'' might have pedicellariae. Species There are six recognized species: * ''Disasterina abnormalis'' Perrier, 1875 * ''Disasterina akajimaensis'' Saba, Iwao & Fujita, 2012 * ''Disasterina ceylanica'' Döderlein, 1888 * ''Disasterina longispina'' (H.L. Clark, 1938) * ''Disasterina odontacantha'' Liao, 1980 * ''Disasterina spinosa'' Koehler, 1910 References Asterinidae Asteroidea genera Taxa name ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edmond Perrier
Jean Octave Edmond Perrier (9 May 1844 – 31 July 1921) was a French zoologist born in Tulle. He is known for his studies of invertebrates (annelids and echinoderms). He was the brother of zoologist Rémy Perrier (1861–1936). Career On advice from Louis Pasteur, he studied sciences at the , where he took classes in zoology from Henri de Lacaze-Duthiers (1821–1901). Afterwards he was a schoolteacher for three years at the college in Agen. In 1869 he obtained his doctorate in natural sciences, later replacing Lacaze-Duthiers at the (1872). In 1876 he attained the chair of Natural History (mollusks, worms and zoophytes) at the National Museum of Natural History, and in 1879 became chairman of the Société zoologique de France. In the early 1880s he participated in a series of sea expeditions, during which, he performed investigations of marine life located within the benthic zone, subsequently gaining international recognition as a specialist of marine fauna. In 1892 he be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species
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. It is the basic unit of Taxonomy (biology), classification and a taxonomic rank of an organism, as well as a unit of biodiversity. Other ways of defining species include their karyotype, DNA sequence, morphology (biology), morphology, behaviour, or ecological niche. In addition, palaeontologists 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. About 14% of these had been described by 2011. All species (except viruses) are given a binomial nomenclature, two-part name, a "binomen". The first part of a binomen is the name of a genus to which the species belongs. The second part is called the specific name (zoology), specific name or the specific ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hubert Lyman Clark
Hubert Lyman Clark (January 9, 1870 – July 31, 1947) was an American zoologist. He received the Clarke Medal from the Royal Society of New South Wales in 1947. A son of UMass Amherst president William Smith Clark, he spent more than 40 years as a professor and curator at the Museum of Comparative Zoology at Harvard University. Life and career Clark was born on January 9, 1870, in Amherst, Massachusetts, to William Smith Clark, president of Massachusetts Agricultural College, and Harriet Kapuolani (née Richards). He attended Amherst College (A.B., 1892) and Johns Hopkins University (Ph.D., 1897), where he studied with William Keith Brooks and became interested in marine biology. After graduation, he taught biology for two years at Amherst College and subsequently served as professor of biology at Olivet College in Michigan from 1899 to 1905. In 1905, Clark joined the Museum of Comparative Zoology at Harvard University as an assistant in invertebrate zoology. In 1910 C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Star
Starfish or sea stars are Star polygon, star-shaped echinoderms belonging to the class (biology), class Asteroidea (). Common usage frequently finds these names being also applied to brittle star, ophiuroids, which are correctly referred to as brittle stars or basket stars. Starfish are also known as asteroids due to being in the class Asteroidea. About 1,900 species of starfish live on the seabed in all the world's oceans, from warm, tropics, tropical zones to frigid, polar regions of Earth, polar regions. They are found from the intertidal zone down to abyssal zone, abyssal depths, at below the surface. Starfish are marine invertebrates. They typically have a central disc and usually five arms, though some species have a larger number of arms. The aboral or upper surface may be smooth, granular or spiny, and is covered with overlapping plates. Many species are brightly coloured in various shades of red or orange, while others are blue, grey or brown. Starfish have tube fe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Family (biology)
Family (, : ) 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". The delineation of what constitutes a family—or whether a described family should be acknowledged—is established and decided upon by active taxonomists. There are not strict regulations for outlining or acknowledging a family, yet in the realm of plants, these classifications often rely on both the vegetative and reproductive characteristics of plant species. Taxonomists frequently hold varying perspectives on these descriptions, leading to a lack of widespread consensus within the scientific community ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asterinidae
The Asterinidae are a large family of sea stars in the order Valvatida. Description and characteristics These are generally small sea stars, flattened dorsally and bearing very short arms, often giving a pentagonal shape in the body ;example: ''Asterians rubens'' (except in some species possessing more than five arms). The periphery of the body is thin and formed by indistinct, tiny marginal plates. They are characterized by their aboral face formed by plates shaped like crescents, sometimes giving a "knitted" appearance to the skin. The abyssal species can be bigger, like those of the genus '' Anseropoda'', which can exceed 45 cm in diameter. Biology Most of the species are small and relatively cryptic: they are often found hidden under rocks or in crevices, for example. Several species have access to a fissiparous asexual reproduction, multiplying their reproductive potential. For that reason, some species of the genera '' Meridiastra'' and '' Aquilonastra'' can some ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Disasterina Spinosa
''Disasterina'' is a genus of sea stars of the family Asterinidae. The genus occurs in the Indian and western Pacific Oceans. Description and characteristics ''Disasterina'' are sea stars with five or rarely six rays (arms). The rays have wide bases and are well-defined. The body is thin. ''Disasterina'' range from small ('' D. spinosa'': radius ) to medium in size ('' D. abnormalis'': radius . Reproduction through fissiparity is not known to occur. '' D. longispina'' might have pedicellariae. Species There are six recognized species: * ''Disasterina abnormalis ''Disasterina'' is a genus of sea stars of the family (biology), family Asterinidae. The genus occurs in the Indian and western Pacific Oceans. Description and characteristics ''Disasterina'' are sea stars with five or rarely six rays (arms ...'' Perrier, 1875 * '' Disasterina akajimaensis'' Saba, Iwao & Fujita, 2012 * '' Disasterina ceylanica'' Döderlein, 1888 * '' Disasterina longispina'' (H.L. Clark, 193 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fragmentation (reproduction)
Fragmentation in multicellular or colonial organisms is a form of asexual reproduction or cloning, where an organism is split into fragments upon maturation and the split part becomes the new individual. The organism may develop specific organs or zones to shed or be easily broken off. If the splitting occurs without the prior preparation of the organism, both fragments must be able to regeneration (biology), regenerate the complete organism for it to function as reproduction. Fragmentation as a method of reproduction is seen in organisms such as spirogyra, filamentous cyanobacteria, Mold (fungus), molds, lichens, sponges, acoelomorpha, acoel flatworms, some annelid worms and sea stars. Fragmentation in various organisms Molds, yeasts and mushrooms, all of which are part of the Fungi kingdom (biology), kingdom, produce tiny filaments called hyphae. These hyphae obtain food and nutrients from the body of other organisms to grow and fertilize. Then a piece of hyphae breaks off an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Disasterina Longispina
''Disasterina'' is a genus of sea stars of the family Asterinidae. The genus occurs in the Indian and western Pacific Oceans. Description and characteristics ''Disasterina'' are sea stars with five or rarely six rays (arms). The rays have wide bases and are well-defined. The body is thin. ''Disasterina'' range from small ('' D. spinosa'': radius ) to medium in size ('' D. abnormalis'': radius . Reproduction through fissiparity is not known to occur. '' D. longispina'' might have pedicellariae. Species There are six recognized species: * ''Disasterina abnormalis'' Perrier, 1875 * '' Disasterina akajimaensis'' Saba, Iwao & Fujita, 2012 * '' Disasterina ceylanica'' Döderlein, 1888 * '' Disasterina longispina'' (H.L. Clark, 1938) * '' Disasterina odontacantha'' Liao, 1980 * ''Disasterina spinosa ''Disasterina'' is a genus of sea stars of the family Asterinidae. The genus occurs in the Indian and western Pacific Oceans. Description and characteristics ''Disasterina'' a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pedicellaria
A pedicellaria (: pedicellariae) is a small wrench- or claw-shaped appendage with movable jaws, called valves, commonly found on echinoderms (phylum Echinodermata), particularly in sea stars (class Asteroidea) and sea urchins (class Echinoidea). Each pedicellaria is an effector organ with its own set of muscles, neuropils, and sensory receptors and is therefore capable of reflex responses to the environment. Pedicellariae are poorly understood but in some taxa, they are thought to keep the body surface clear of algae, encrusting organisms, and other debris in conjunction with the ciliated epidermis present in all echinoderms. These structures are derived from the mesodermal skeleton. In sea stars Types There are two major types of pedicellaria in sea stars: straight and crossed. Straight pedicellaria are typically larger and located on the body surface, whereas crossed pedicellaria are smaller and found more commonly on stalks, raised above the body surface or in clum ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
