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Dolioletta Chuni
''Dolioletta'' is a genus of tunicates in the family Doliolidae. Characteristics Members of the genus ''Dolioletta'' are transparent, gelatinous barrel-shaped animals, usually less than one centimetre long. They move in jerks by contracting the circular bands of muscle in their body wall sharply.''Dolioletta'' JelliesZone. Retrieved 2011-11-17. Biology They have the complex life cycle typical of the , with alternating sexual and asexual phases. They use a net of mucus strands to efficiently trap floating past. They both grow fast and multiply rapidly and a s ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus comes above species and below family (taxonomy), family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. ''Panthera leo'' (lion) and ''Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomy (biology), taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tunicate
A tunicate is a marine invertebrate animal, a member of the subphylum Tunicata (). It is part of the Chordata, a phylum which includes all animals with dorsal nerve cords and notochords (including vertebrates). The subphylum was at one time called Urochordata, and the term urochordates is still sometimes used for these animals. They are the only chordates that have lost their myomeric segmentation, with the possible exception of the 'seriation of the gill slits'. Some tunicates live as solitary individuals, but others replicate by budding and become colonies, each unit being known as a zooid. They are marine filter feeders with a water-filled, sac-like body structure and two tubular openings, known as siphons, through which they draw in and expel water. During their respiration and feeding, they take in water through the incurrent (or inhalant) siphon and expel the filtered water through the excurrent (or exhalant) siphon. Most adult tunicates are sessile, immobile and perman ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Doliolidae
Doliolidae is a family of tunicates in the order Doliolida. Members of the family are pelagic and often found far away from coastlines.Doliolidae World Register of Marine Species. Retrieved 2011-11-17. Members of the family are transparent, gelatinous, barrel-shaped or cylindrical marine organisms. They are mostly small and inconspicuous. They have which move water through the nets which they use to trap the on which they feed. This is in contrast to their close ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Doliolida
The Doliolida are an order of small marine animals of the subphylum Tunicata. They are in the class Thaliacea, which also includes the salps and pyrosomes. The doliolid body is small, typically 1–2 mm long, and barrel-shaped; it features two wide siphons, one at the front and the other at the back end, and eight or nine circular muscle strands reminiscent of barrel bands. Like all tunicates, except for the predatory tunicate, they are filter feeders. Unlike the related class Ascidiacea, which are sessile, but like the class Appendicularia, they are free-swimming plankton; cilia pump water through the body which drives them forward. As the water passes through, small particles and plankton on which the animal feeds are strained from the water by the gill slits. Doliolids can also move by contracting the muscular bands around the body creating a temporary water jet that thrusts them forward or backward quite quickly. The Doliolida have a complicated life cycle that i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phytoplankton
Phytoplankton () are the autotrophic (self-feeding) components of the plankton community and a key part of ocean and freshwater ecosystems. The name comes from the Greek words (), meaning 'plant', and (), meaning 'wanderer' or 'drifter'. Phytoplankton obtain their energy through photosynthesis, as do trees and other plants on land. This means phytoplankton must have light from the sun, so they live in the well-lit surface layers (euphotic zone) of oceans and lakes. In comparison with terrestrial plants, phytoplankton are distributed over a larger surface area, are exposed to less seasonal variation and have markedly faster turnover rates than trees (days versus decades). As a result, phytoplankton respond rapidly on a global scale to climate variations. Phytoplankton form the base of marine and freshwater food webs and are key players in the global carbon cycle. They account for about half of global photosynthetic activity and at least half of the oxygen production, despite ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Swarm
Swarm behaviour, or swarming, is a collective behaviour exhibited by entities, particularly animals, of similar size which aggregate together, perhaps milling about the same spot or perhaps moving ''en masse'' or migrating in some direction. It is a highly interdisciplinary topic. As a term, ''swarming'' is applied particularly to insects, but can also be applied to any other entity or animal that exhibits swarm behaviour. The term '' flocking'' or ''murmuration'' can refer specifically to swarm behaviour in birds, ''herding'' to refer to swarm behaviour in tetrapods, and ''shoaling'' or ''schooling'' to refer to swarm behaviour in fish. Phytoplankton also gather in huge swarms called ''blooms'', although these organisms are algae and are not self-propelled the way animals are. By extension, the term "swarm" is applied also to inanimate entities which exhibit parallel behaviours, as in a robot swarm, an earthquake swarm, or a swarm of stars. From a more abstract point of v ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dolioletta Chuni
''Dolioletta'' is a genus of tunicates in the family Doliolidae. Characteristics Members of the genus ''Dolioletta'' are transparent, gelatinous barrel-shaped animals, usually less than one centimetre long. They move in jerks by contracting the circular bands of muscle in their body wall sharply.''Dolioletta'' JelliesZone. Retrieved 2011-11-17. Biology They have the complex life cycle typical of the , with alternating sexual and asexual phases. They use a net of mucus strands to efficiently trap floating past. They both grow fast and multiply rapidly and a s ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dolioletta Gegenbauri
''Dolioletta gegenbauri'' is a species of tunicate in the family Doliolidae. It is small, exists in various forms and is sometimes found in great abundance in the Atlantic and Pacific waters where it lives. Life cycle ''Dolioletta gegenbauri'' is a small, transparent, gelatinous marine invertebrate up to one centimetre long. It has a complex life cycle and exists in several forms of which the gonozooid, or mature zooid with gonads, is the most often seen. It is roughly cylindrical with a siphon at both of the flat ends, and has 8 bands of muscle arranged like hoops round a barrel. The U-shaped gut and other organs can be seen through the test which is pierced by 10 to 40 gill slits. The gonozooid is hermaphrodite and the eggs are fertilised by sperm from another individual. These develop into oozooids which have no reproductive organs. They have 9 bands of muscle and are known as "nurses" as they develop a tail of zooids produced asexually. Some of these are known as gastrozoo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dolioletta Mirabilis
''Dolioletta mirabilis'' is a species of tunicate in the family Doliolidae. It is small, exists in various forms and is sometimes found in great abundance in the Indo-Pacific waters where it lives. Description The gonozooids are the most often encountered of the forms of this animal. They are solitary hermaphrodite In reproductive biology, a hermaphrodite () is an organism that has both kinds of reproductive organs and can produce both gametes associated with male and female sexes. Many Taxonomy (biology), taxonomic groups of animals (mostly invertebrate ...s with eight bands of muscle that encircle the body. These gonozooids produce the oozooids, which are usually seen in smaller numbers within the population. Oozooids are distinguished by a conspicuous tail of asexually produced zooids, and have nine circumferential bands of muscle. References {{Taxonbar, from=Q4910801 Thaliacea Animals described in 1891 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dolioletta Tritonis
''Dolioletta'' is a genus of tunicates in the family Doliolidae. Characteristics Members of the genus ''Dolioletta'' are transparent, gelatinous barrel-shaped animals, usually less than one centimetre long. They move in jerks by contracting the circular bands of muscle in their body wall sharply.''Dolioletta'' JelliesZone. Retrieved 2011-11-17. Biology They have the complex life cycle typical of the , with alternating sexual and asexual phases. They use a net of mucus strands to efficiently trap floating past. They both grow fast and multiply rapidly and a s ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dolioletta Valdiviae
''Dolioletta'' is a genus of tunicates in the family Doliolidae. Characteristics Members of the genus ''Dolioletta'' are transparent, gelatinous barrel-shaped animals, usually less than one centimetre long. They move in jerks by contracting the circular bands of muscle in their body wall sharply.''Dolioletta'' JelliesZone. Retrieved 2011-11-17. Biology They have the complex life cycle typical of the , with alternating sexual and asexual phases. They use a net of mucus strands to efficiently trap floating past. They both grow fast and multiply rapidly and a s ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thaliacea
The Thaliacea comprise a class of marine animals within the subphylum Tunicata. Unlike their benthic relatives the ascidians, thaliaceans are free-floating (pelagic) for their entire lifespan. The group includes species with complex life cycles, with both solitary and colonial forms. Anatomy The three orders of thaliaceans are filter feeders. Pyrosomes are colonial animals, with multiple tiny ascidian-like zooids arranged in a cylinder closed at one end. All of the atrial siphons point inwards, emptying into a single, common cloaca in the centre of the cylinder. As the water exhaled by the zooids exits through a common opening, the water movement slowly propels the pyrosome through the sea. Salps and doliolids have a transparent barrel-shaped body through which they pump water, propelling them through the sea, and from which they extract food. The bulk of the body consists of the large pharynx. Water enters the pharynx through the large buccal siphon at the front end of the a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
