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Meridiastra Occidens
''Meridiastra'' is a genus of star fish in the family Asterinidae. The genus is found in the Indian and Pacific Oceans, with most records from the waters around Australia. They occur in shallow waters down to a depth of about . ''Meridiastra'' are morphologically similar to the Atlantic genus '' Asterina''. They are also phylogenetically close and possibly sister genera. Etymology The generic name is derived from the Latin ''meridies'' (=south) and ''astrum'' (=star), in reference to the southern Australian and Pacific distribution of the genus (at the time of description – the genus now includes also species occurring on the northern hemisphere (Mexico, Panama)). Description ''Meridiastra'' are sea stars with five to eight rays (arms). They range from very small (''Meridiastra rapa'': radius ) to medium-sized (''Meridiastra gunnii'': radius ). The interradial margin is straight to incurved; when the rays are distinct, they have narrowly rounded to pointed tips. One species, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meridiastra Gunnii
''Meridiastra gunnii'' is an Australian species of 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 .... It has six arms and can be any colour. Molecular evidence indicated that there were genetically divergent eastern and western forms of what is currently referred to as ''M. gunnii'' in southern Australia, and that a taxonomic revision was necessary. Further studies have shown that it can be conspecific with ''Patiriella brevispina''.P.M O'Loughlin et al., A molecular and morphological review of the asterinid, Patiriella gunnii (Gray) (Echinodermata: Asteroidea). Memoirs of Museum Victoria 60(2): 181–195 (2003) References Asterinidae Starfish described in 1840 {{Asteroidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meridiastra Occidens
''Meridiastra'' is a genus of star fish in the family Asterinidae. The genus is found in the Indian and Pacific Oceans, with most records from the waters around Australia. They occur in shallow waters down to a depth of about . ''Meridiastra'' are morphologically similar to the Atlantic genus '' Asterina''. They are also phylogenetically close and possibly sister genera. Etymology The generic name is derived from the Latin ''meridies'' (=south) and ''astrum'' (=star), in reference to the southern Australian and Pacific distribution of the genus (at the time of description – the genus now includes also species occurring on the northern hemisphere (Mexico, Panama)). Description ''Meridiastra'' are sea stars with five to eight rays (arms). They range from very small (''Meridiastra rapa'': radius ) to medium-sized (''Meridiastra gunnii'': radius ). The interradial margin is straight to incurved; when the rays are distinct, they have narrowly rounded to pointed tips. One species, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meridiastra Mortenseni
''Meridiastra mortenseni'' is a sea star of the family Asterinidae. It is endemic to New Zealand. Described as ''Patiriella mortenseni'' in 2002, it is named after T. Mortensen, who recorded it as distinct from ''Patiriella regularis'', the New Zealand common cushion star, in 1925.Mortensen, T. 1925: Echinoderms of New Zealand and the Auckland-Campbell Islands. III-V. Asteroidea, Holothurioidea, Crinoidea. ''Videnskabelige Meddelelser fra Dansk naturhistorisk Forening i København'' 79: 261–420. According to genetic evidence, ''P. mortenseni'' was moved from the ''Patiriella'' genus to ''Meridiastra'' in 2004. Reciprocal transplant experiments in Fiordland have shown it is less tolerant of hyposaline conditions than the sympatric (but distantly related) ''P. regularis''. This is reflected in its distribution: it lives in deeper waters (at depths of roughly 10±3 m in Milford and Doubtful Sounds), below the low salinity layer. In laboratory conditions, they die after 24-hour ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meridiastra Modesta
''Meridiastra'' is a genus of star fish in the family Asterinidae. The genus is found in the Indian and Pacific Oceans, with most records from the waters around Australia. They occur in shallow waters down to a depth of about . ''Meridiastra'' are morphologically similar to the Atlantic genus '' Asterina''. They are also phylogenetically close and possibly sister genera. Etymology The generic name is derived from the Latin ''meridies'' (=south) and ''astrum'' (=star), in reference to the southern Australian and Pacific distribution of the genus (at the time of description – the genus now includes also species occurring on the northern hemisphere (Mexico, Panama)). Description ''Meridiastra'' are sea stars with five to eight rays (arms). They range from very small (''Meridiastra rapa'': radius ) to medium-sized (''Meridiastra gunnii'': radius ). The interradial margin is straight to incurved; when the rays are distinct, they have narrowly rounded to pointed tips. One species, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meridiastra Calcar
''Meridiastra calcar'', formerly classified as ''Patiriella calcar'', is a species of sea star in the family Asterinidae. It is endemic to Australia. It is commonly known as carpet sea star, cushion sea star, or eight-armed sea star. Description The cushion sea star has eight short, distinct, triangular "arms", though 7- or 9-armed individuals can be found. These "arms" are laterally fused together for some of their length, leaving ray-like tips of varying length to jut from the disk-like body. This species aboral surface can be any colour or combination of colours, while the oral side is uniformly pale. This sea star attains a maximum diameter from arm tip to arm tip of 5 cm–10 cm. Distribution and habitat The cushion sea star is found in the intertidal zone of Australian coasts from Western Australia's south coast to Queensland's coast off Currumbin, while including Tasmania, South Australia, Victoria and New South Wales. This sea star species favours rocky coasts ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fissiparous
Fission, in biology, is the division of a single entity into two or more parts and the regeneration of those parts to separate entities resembling the original. The object experiencing fission is usually a cell, but the term may also refer to how organisms, bodies, populations, or species split into discrete parts. The fission may be ''binary fission'', in which a single organism produces two parts, or ''multiple fission'', in which a single entity produces multiple parts. Binary fission Organisms in the domains of Archaea and Bacteria reproduce with binary fission. This form of asexual reproduction and cell division is also used by some organelles within eukaryotic organisms (e.g., mitochondria). Binary fission results in the reproduction of a living prokaryotic cell (or organelle) by dividing the cell into two parts, each with the potential to grow to the size of the original. Fission of prokaryotes The single DNA molecule first replicates, then attaches each copy to a diffe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meridiastra Fissura
''Meridiastra'' is a genus of star fish in the family Asterinidae. The genus is found in the Indian and Pacific Oceans, with most records from the waters around Australia. They occur in shallow waters down to a depth of about . ''Meridiastra'' are morphologically similar to the Atlantic genus '' Asterina''. They are also phylogenetically close and possibly sister genera. Etymology The generic name is derived from the Latin ''meridies'' (=south) and ''astrum'' (=star), in reference to the southern Australian and Pacific distribution of the genus (at the time of description – the genus now includes also species occurring on the northern hemisphere (Mexico, Panama)). Description ''Meridiastra'' are sea stars with five to eight rays (arms). They range from very small (''Meridiastra rapa'': radius ) to medium-sized (''Meridiastra gunnii'': radius ). The interradial margin is straight to incurved; when the rays are distinct, they have narrowly rounded to pointed tips. One species, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 species that contains the biological Type (biology), type wiktionary:en:specimen, specimen (or specimens). Article 67.1 A similar concept is used for suprageneric groups and called a type genus. In botanical nomenclature, these terms have no formal standing under the International Code of Nomenclature for algae, fungi, and plants, code of nomenclature, but are sometimes borrowed from zoological nomenclature. In botany, the type of a genus name is a specimen (or, rarely, an illustration) which is also the type of a species name. The species name with that type can also be referred to as the type of the genus name. Names of genus and family ranks, the various subdivisions of those ranks, and some higher-rank names based on genus names, have suc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
