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Paxillosida
The Paxillosida are a large order (biology), order of sea stars. Characteristics Paxillosida adults lack an anus and have no suckers on their tube feet. They do not develop the brachiolaria stage in their early development.Matsubara, M., Komatsu, M., Araki, T., Asakawa, S., Yokobori, S.-I., Watanabe, K. & Wada, H. (2005) The phylogenetic status of Paxillosida (Asteroidea) based on complete mitochondrial DNA sequences. Molecular Genetics and Evolution, 36, 598–605 They possess marginal plates, and have sessile pedicellariae. They mostly inhabit soft-bottomed environments of sand or mud. Systematics Recent analyses suggest Paxillosida may be a sister taxon of Asterina (starfish), Asterina. The order is divided into these families: * family Astropectinidae Gray, 1840 * family Ctenodiscidae Sladen, 1889 * family Goniopectinidae Verrill, 1889 * family Luidiidae Sladen, 1889 * family Porcellanasteridae Sladen, 1883 * family Pseudarchasteridae * family Radiasteridae Fisher, 1916 Fil ... [...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 fee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Porcellanasteridae
The Porcellanasteridae are a family of sea stars in the order Paxillosida. These sea stars are found at abyssal depths. The World Asteroidea Database includes these genera 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 nomenclat ... in this family: *'' Abyssaster'' Madsen, 1961 *'' Benthogenia'' Fisher, 1911 *'' Damnaster'' H.E.S. Clark & McKnight, 1994 *'' Eremicaster'' Fisher, 1905 *'' Hyphalaster'' Sladen, 1883 *'' Lethmaster'' Belyaev, 1969 *'' Lysaster'' Bell, 1909 *'' Porcellanaster'' Wyville Thomson, 1877 *'' Sidonaster'' Koehler, 1909 *'' Styracaster'' Sladen, 1883 *'' Thoracaster'' Sladen, 1883 *'' Vitjazaster'' Belyaev, 1969 References Paxillosida Echinoderm families {{Asteroidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudarchasteridae
Pseudarchasteridae is a family of echinoderms belonging to the order Paxillosida The Paxillosida are a large order (biology), order of sea stars. Characteristics Paxillosida adults lack an anus and have no suckers on their tube feet. They do not develop the brachiolaria stage in their early development.Matsubara, M., Komatsu .... Genera: * '' Gephyreaster'' Fisher, 1910 * '' Paragonaster'' Sladen, 1889 * '' Perissogonaster'' Fisher, 1913 * '' Pseudarchaster'' Sladen, 1889 * '' Skiaster'' Blake & Jagt, 2005 References Paxillosida Echinoderm families {{Asteroidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astropectinidae
The Astropectinidae are a family of sea stars in the order Paxillosida. Usually, these starfish live on the seabed and immerse themselves in soft sediment such as sand and mud. They are not to be confused with species in the genus '' Archaster'', which share similar shape and life habits, but belong to the family Archasteridae (order Valvatida). Genera There are 27 genera in the family: * '' Astromesites'' Fisher, 1913 * ''Astropecten'' Gray, 1840 * '' Astropectinides'' Verrill, 1914 * '' Bathybiaster'' Danielssen & Koren, 1883 * '' Blakiaster'' Perrier, 1881 * '' Bollonaster'' McKnight, 1977 * '' Bunodaster'' Verrill, 1909 * '' Craspidaster'' Sladen, 1889 * '' Ctenophoraster'' Fisher, 1906 * '' Ctenopleura'' Fisher, 1913 * '' Dipsacaster'' Alcock, 1893 * '' Dytaster'' Sladen, 1889 * '' Koremaster'' Fisher, 1913 * '' Leptychaster'' E.A. Smith, 1876 * '' Lonchotaster'' Sladen, 1889 * '' Macroptychaster'' H.E.S. Clark, 1963 * '' Mimastrella'' Fisher, 1916 * '' Patagiaster'' Fisher ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ctenodiscidae
Ctenodiscidae is a family of echinoderms belonging to the order Paxillosida The Paxillosida are a large order of sea stars. Characteristics Paxillosida adults lack an anus and have no suckers on their tube feet. They do not develop the brachiolaria stage in their early development.Matsubara, M., Komatsu, M., Araki, T., .... Genera: * '' Ctenodiscus'' Müller & Troschel, 1842 * '' Paleoctenodiscus'' Blake, 1988 References Paxillosida Echinoderm families {{asteroidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Goniopectinidae
Goniopectinidae is a family of echinoderms belonging to the order Paxillosida The Paxillosida are a large order (biology), order of sea stars. Characteristics Paxillosida adults lack an anus and have no suckers on their tube feet. They do not develop the brachiolaria stage in their early development.Matsubara, M., Komatsu .... Genera: * '' Chrispaulia'' Gale, 2005 * '' Goniopecten'' Perrier, 1881 * '' Pectinidiscus'' Ludwig, 1907 * '' Prionaster'' Verrill, 1899 References Paxillosida Echinoderm families {{asteroidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radiasteridae
Radiasteridae is a family of echinoderms belonging to the order Paxillosida The Paxillosida are a large order (biology), order of sea stars. Characteristics Paxillosida adults lack an anus and have no suckers on their tube feet. They do not develop the brachiolaria stage in their early development.Matsubara, M., Komatsu .... Genera: * '' Betelgeusia'' Blake & Reid, 1998 * '' Gephyriaster'' * '' Indiaster'' Raghavendra Rao, 1957 * '' Radiaster'' Perrier, 1881 References {{Taxonbar, from=Q18548641 Paxillosida ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brachiolaria
A brachiolaria is the second stage of larval development in many starfishes. It follows the bipinnaria. Brachiolaria have bilateral symmetry, unlike the adult starfish, which have a pentaradial symmetry. Starfish of the order Paxillosida (''Astropecten'' and '' Asterina'') have no brachiolaria stage, with the bipinnaria developing directly into an adult. The brachiolaria develops from the bipinnaria larva when the latter grows three short arms at the underside of its anterior end. These arms each bear sticky cells at the tip, and they surround an adhesive sucker. The larva soon sinks to the bottom, attaching itself to the substrate, firstly with the tips of the arms, and then with the sucker. Once attached, it begins to metamorphose into the adult form. The adult starfish develops only from the hind-part of the larva, away from the sucker. It is from this part that the arms of the adult grow, with the larval arms eventually degenerating and disappearing. The digestive system of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astropecten Bispinosus
''Astropecten bispinosus'' is a sea star of the family Astropectinidae from the Mediterranean Sea. Habitat and behaviour Starfishes of genus Astropecten live on mobile seabed (sandy, muddy or gravel seabed) and they remain largely buried under sediment during the day. During the late afternoon and during the night starfishes go out to hunt mainly bivalve molluscs, which are their favourite preys. This species lives only in the Mediterranean Sea and it prefers sandy seabed near meadows of ''Cymodocea nodosa'' and it lives at depths between 2 and 100 m. This species is active and easy to find especially in the late afternoon, but sometimes it is possible to find it during the day or during the night. Description This sea star has very narrow and high superomarginal plates with a bare area on vertical face of them (visible in the lateral side of arms between inferomarginal spines and superomarginal spines). Every superomarginal plate is equipped with 1 very long, sharp, clean co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Luidia Senegalensis
''Luidia senegalensis'', the nine-armed sea star, is a tropical species of starfish in the family Luidiidae found in the western Atlantic Ocean. Description The nine-armed sea star has long, slim tapering arms attached to a small circular central disc. It grows to a diameter of about . The aboral or upper surface has a patchwork of closely packed spiny plates. The square ones near the edge of the arms are cream coloured and the irregular ones in a band running down the middle of the arms are grey. The margins of the arms are fringed with short white spines. The oral or underside of the sea star has further small white spiny plates down the edges of the arms and a central band of translucent, orange tube feet. Like other members of its genus, it has tube feet without suckers. The mouth is at the centre of the disc and there is no anus, undigested food fragments being expelled through the mouth. Distribution and habitat The nine-armed sea star is found at depths of up to around ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Luidia Ciliaris
''Luidia ciliaris'', the seven-armed sea star, is a species of sea star (starfish) in the family Luidiidae. It is found in the eastern Atlantic Ocean and the Mediterranean Sea. Description ''L. ciliaris'' is an orangeish-brown colour and has seven long arms radiating from a small disk. It is a large but fragile sea star, growing to across, and easily losing its arms (which afterwards regenerate). The arms have parallel sides and taper only near the tip. They have a conspicuous fringe of white spines along the margins. The upper surface is clothed in paxillae, spines shaped like a pillar with a flat top bearing tiny spinules. Also, many-lobed, nipple-like papillae are seen. No marginal plates are on the upper side of the arms, but those on the lower side bear pedicellariae with two valves. The tube feet are long and numerous. They do not have suction pads, but have two sets of terminal bulbs. The gonads are arranged in two rows along the length of the arms. A mouth is at the c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astropecten Platyacanthus
''Astropecten platyacanthus'' is a sea star of the family Astropectinidae. Habitat and behaviour Starfishes of genus Astropecten live on mobile seabed (sandy, muddy or gravel seabed) and they remain largely buried under sediment during the day. During the late afternoon and the night starfishes go out to hunt mainly bivalve molluscs, which are their favourite preys. This species lives only in the Mediterranean Sea and it lives on all mobile seabed at depths between 1 and 60 m, but it is more frequently in seabed of mixed coarse sand and mud at 1–4 m depth. This species is active and easy to find during the night but also during the day, especially in early morning and late afternoon. Description It has narrow and high superomarginal plates, laterally covered with scales and small spines (on vertical face). Every superomarginal plates is equipped with one strong spine, usually sharp but irregularly shaped, slightly flattened laterally, often yellow or orange but rarely off whi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
