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Apodida
Apodida is an order (biology), order of littoral to deep-sea, largely Fauna#Infauna, infaunal Holothuroidea, holothurians, sea cucumbers. This order comprises three families, 32 genus, genera and about 270 known species, called apodids, "without feet". Characteristics These sea cucumbers are vagile holothurians with an elongated shape (up to 3 meters for ''Synapta maculata''), worm or snake-like. Their shape is adapted for burrowing through the sediment, sometimes in a fashion similar to earthworms. Their mouth is surrounded with 10-25 pinnate or peltate tentacles. The absence of tube feet gives the order its name, ''Apodida'' meaning ''without feet'' : they move by crawling on the sediment, hence they need flat bottoms with few current. Members of this order have a circum-oral ring and tentacles, but do not have tube feet or radial canals. They also lack the complex respiratory trees found in other sea cucumbers, and Aquatic respiration, respire and excrete nitrogenous waste thr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holothuroidea
Sea cucumbers are echinoderms from the class Holothuroidea ( ). They are benthic marine animals found on the sea floor worldwide, and the number of known holothuroid species worldwide is about 1,786, with the greatest number being in the Asia–Pacific region. Sea cucumbers serve a useful role in the marine ecosystem as detritivores who help recycle nutrients, breaking down detritus and other organic matter, after which microbes can continue the decomposition process. Sea cucumbers have a leathery skin and an elongated body containing a single, branched gonad, are named for their overall resemblance to the fruit of the cucumber plant. Like all echinoderms, sea cucumbers have a calcified dermal endoskeleton, which is usually reduced to isolated microscopic ossicles (or sclerietes) joined by connective tissue. In some species these can sometimes be enlarged to flattened plates, forming an armoured cuticle. In some abyssal or pelagic species such as '' Pelagothuria natatrix'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chiridotidae
Chiridotidae is a family of sea cucumbers found in the order Apodida. Within the family, there are 16 recognized genera all with different ranges of body types and functions. Sea cucumbers play a fundamental role in many marine ecosystems. Description Members in this family have 10, 12, or 18 pelto-digitate tentacles. They lack podia, radial canals, a respiratory tree, and papillae. However, their body structure does include ossicles, tentacles, a calcareous ring, and a ciliary urn. Chiridotidae typically undergo direct development and can usually be found in benthic ecosystems. Within their benthic systems they feed off of detritus meaning they must have a digestive tract. Taxonomy The following genera are recognised in the family Chiridotidae: * '' Archedota'' O'Loughlin in O'Loughlin & VandenSpiegel, 2007 -- 1 species * '' Chiridota'' Eschscholtz, 1829 -- 37 species * '' Gymnopipina'' Souto & Martins in Souto et al., 2017 -- 1 species * †'' Jumaraina'' Soodan, 19 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apodida
Apodida is an order (biology), order of littoral to deep-sea, largely Fauna#Infauna, infaunal Holothuroidea, holothurians, sea cucumbers. This order comprises three families, 32 genus, genera and about 270 known species, called apodids, "without feet". Characteristics These sea cucumbers are vagile holothurians with an elongated shape (up to 3 meters for ''Synapta maculata''), worm or snake-like. Their shape is adapted for burrowing through the sediment, sometimes in a fashion similar to earthworms. Their mouth is surrounded with 10-25 pinnate or peltate tentacles. The absence of tube feet gives the order its name, ''Apodida'' meaning ''without feet'' : they move by crawling on the sediment, hence they need flat bottoms with few current. Members of this order have a circum-oral ring and tentacles, but do not have tube feet or radial canals. They also lack the complex respiratory trees found in other sea cucumbers, and Aquatic respiration, respire and excrete nitrogenous waste thr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chiridota Hydrothermica
''Chiridota hydrothermica'' is a species of sea cucumber in the family Chiridotidae. It has a cosmopolitan distribution. It occupies all three types of chemosynthetic ecosystems; hydrothermal vents, cold seep A cold seep (sometimes called a cold vent) is an area of the ocean floor where seepage of fluids rich in hydrogen sulfide, methane, and other hydrocarbons occurs, often in the form of a brine pool. ''Cold'' does not mean that the temperature ...s, and organic fall. Unlike many other animals in similar environments, they do not host chemosynthetic bacteria. References Chiridotidae Cosmopolitan animals Animals described in 2000 {{Holothuroidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Achistrum
''Achistrum'' is an extinct genus of sea cucumber which existed in Poland during the Triassic period, and the United States during the Carboniferous The Carboniferous ( ) is a Geologic time scale, geologic period and System (stratigraphy), system of the Paleozoic era (geology), era that spans 60 million years, from the end of the Devonian Period Ma (million years ago) to the beginning of the ... period. Krystyna Zawidzka. It contains the species ''Achistrum nicholsoni'' and ''Achistrum ludwigi''. References Apodida Carboniferous echinoderms[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tube Feet
Tube or tubes may refer to: * Tube (2003 film), ''Tube'' (2003 film), a 2003 Korean film * "Tubes" (Peter Dale), performer on the Soccer AM#Tubes, Soccer AM television show * Tube (band), a Japanese rock band * Tube & Berger, the alias of dance/electronica producers Arndt Rörig and Marco Vidovic from Germany Other media * Tube, a freeware game for MS-DOS computers from Bullfrog Productions * ''TUBE.'', an online magazine about visual and performing arts, founded in 2012 in Sacramento, California * Series of tubes, an analogy for the Internet used by United States Senator Ted Stevens * Picture tube, term in PaintShop Pro#Picture tubes, Paint Shop Pro software for a small digital image with no background Science, technology, and mathematics Construction and mechanics * Tube (fluid conveyance), a long hollow cylinder used for moving fluids * Tube (structure), building designed to act like a hollow cylinder, cantilevered perpendicular to the ground * Inner tube, a component of vehi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Synaptula Lamperti
''Synaptula lamperti'' is a species of sea cucumber in the family Synaptidae in the phylum Echinodermata, found on coral reefs in the Indo-Pacific region. The echinoderms are marine invertebrates and include the sea urchins, starfish and sea cucumbers. They are radially symmetric and have a water vascular system that operates by hydrostatic pressure, enabling them to move around by use of many suckers known as tube feet. Sea cucumbers are usually leathery, gherkin-shaped animals with a cluster of short tentacles at one end. They live on the sea bottom. Description ''S. lamperti'' has an elongated, opaque body with several dark-coloured, longitudinal stripes.Gad-Zooks Cukes! Sea Cucumbers: Not A Pretty Picture ''Wet Web Media.com''. Retrieved July 27, 2011. There are no |
Polyplectana Kefersteinii
''Polyplectana'' is a genus of sea cucumbers in the family Synaptidae. The type species is '' Polyplectana kefersteinii''. Species The World Register of Marine Species lists the following 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), ... : *'' Polyplectana galatheae'' Heding, 1928 *'' Polyplectana grisea'' Heding, 1931 *'' Polyplectana kallipeplos'' (Sluiter, 1887) *'' Polyplectana kefersteinii'' (Selenka, 1867) *'' Polyplectana longogranula'' Heding, 1928 *'' Polyplectana nigra'' (Semper, 1867) *'' Polyplectana oculata'' Heding, 1928 *'' Polyplectana samoae'' Heding, 1928 *'' Polyplectana sluiteri'' Heding, 1928 *'' Polyplectana tahitiensis'' Heding, 1928 *'' Polyplectana unispicula'' Heding, 1931 *'' Polyplectana zamboangae'' Heding, 1928 References H ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Euapta Lappa
''Euapta lappa'', the beaded sea cucumber, is a species of sea cucumbers in the family Synaptidae in the phylum Echinodermata. It is found on coral reefs in the Caribbean region. Description In appearance, the beaded sea cucumber resembles a long worm rather than a sea cucumber. It can reach up to a metre (yard) in length and has a diameter of up to . It lengthens and shortens repeatedly and when disturbed, the normally flaccid body retracts vigorously to a fraction of its original length. It has no internal respiratory tree, nor does it have tube feet, and the body surface is covered by rounded ridges. The skeletal structure consists of many tiny calcareous plates embedded in the cuticle. Little hooks project from these ossicles and make the body feel sticky to the touch. At the anterior (front) of the animal there is a ring of fifteen branched feeding tentacles. The body colour is pale brown or grey, often with white flecks or darker, longitudinal streaks and transverse bandin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polycheira Rufescens
''Polycheira'' is a genus of holothurians (sea cucumbers) found in tropical Indo-Pacific. A curious pattern of reproduction has been found in '' Polycheira rufescens'' where specimens change their sex from male to female and from female to male in a reproductive season Systematics ''Polycheira'' appear to be closely related to the genus '' Chiridota'' (both belong to the subfamily Chiridotinae). The type species In International_Code_of_Zoological_Nomenclature, zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the spe ... of the genus is ''Polycheira rufescens'' (Brandt, 1835). The following species are recognised in the genus ''Polycheira'': *'' Polycheira echinata'' Heding, 1928 *'' Polycheira rufescens'' (Brandt, 1835) References Holothuroidea genera Chiridotidae {{Holothuroidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aquatic Respiration
Aquatic respiration is the Biological process, process whereby an aquatic animal, aquatic organism exchanges Respiration (physiology), respiratory gases with water, obtaining oxygen from oxygen dissolved in water and excretion, excreting carbon dioxide and some other metabolic waste products into the water. Unicellular and simple small organisms In very small animals, plants and bacteria, simple diffusion of gaseous metabolites is sufficient for respiratory function and no special adaptations are found to aid respiration. Passive diffusion or active transport are also sufficient mechanisms for many larger aquatic animals such as many worms, jellyfish, sponges, bryozoans and similar organisms. In such cases, no specific respiratory organs or organelles are found. Higher plants Although higher plants typically use carbon dioxide and excrete oxygen during photosynthesis, they also respire and, particularly during darkness, many plants excrete carbon dioxide and require oxygen to ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radial Canal
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