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Atriolum
''Atriolum'' is a genus of colonial tunicates in the order Enterogona. These are marine animals found attached to the seabed or some other surface. Species The World Register of Marine Species lists the following species in the genus: *'' Atriolum bucinum'' Kott, 2001 *'' Atriolum eversum'' Kott, 2001 *'' Atriolum glauerti'' (Michaelsen, 1930) *'' Atriolum lilium'' Kott, 2001 *'' Atriolum marinense'' Kott, 2001 *'' Atriolum marsupialis'' Monniot, 1989 *'' Atriolum quadratum'' Monniot & Monniot, 1996 *''Atriolum robustum ''Atriolum robustum'' is a colonial tunicate or sea squirt in the family ''Didemnidae''. It is native to the western and central Indo-Pacific where it is usually found anchored to a hard surface in shallow water. Description A colony of ''Atriol ...'' Kott, 1983 *'' Atriolum tubiporum'' Kott, 2001 References Enterogona Tunicate genera {{tunicata-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atriolum Robustum
''Atriolum robustum'' is a colonial tunicate or sea squirt in the family ''Didemnidae''. It is native to the western and central Indo-Pacific where it is usually found anchored to a hard surface in shallow water. Description A colony of ''Atriolum robustum'' consists of a number of hollow, urn-shaped zooids up to long, each with a large circular terminal hole, the atrial siphon, and connected by an encrusting base. The tunic (body wall) is firm to the touch and is perforated by a number of pore-like buccal siphons, each raised on a slight elevation, giving the zooid a pine cone-like appearance. The tunic contains a red pigment but the colour of this is often masked by the presence of yellowish-green cyanobacteria (''Prochloron'' sp.) and may only be visible in the interior and at the rim of the atrial syphon. This sea squirt is sometimes confused with ''Didemnum molle'' but that species has a network of internal channels and exudes mucus, making it sticky to the touch. Distrib ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
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 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 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 of an ancestral taxon are grouped together (i.e. phylogenetic analysis should c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colony (biology)
In biology, a colony is composed of two or more conspecific individuals living in close association with, or connected to, one another. This association is usually for mutual benefit such as stronger defense or the ability to attack bigger prey. Colonies can form in various shapes and ways depending on the organism involved. For instance, the bacterial colony is a cluster of identical cells (clones). These colonies often form and grow on the surface of (or within) a solid medium, usually derived from a single parent cell. Colonies, in the context of development, may be composed of two or more unitary (or solitary) organisms or be modular organisms. Unitary organisms have determinate development (set life stages) from zygote to adult form and individuals or groups of individuals (colonies) are visually distinct. Modular organisms have indeterminate growth forms (life stages not set) through repeated iteration of genetically identical modules (or individuals), and it can be diffi ... [...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 an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
