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Holasteroida
Holasteroida is an order of irregular sea urchins. Characteristics These irregular sea urchins are characterized by a particularly marked bilateral symmetry, including for the apical system, which is highly elongated. In some contemporary abyssal groups such as Pourtalesiidae, some species are even bottle-shaped. The mouth (peristome) does not contain an Aristotle's lantern. The anus (periproct) has migrated towards the periphery of the test. The plastron is never amphisternous. Image:MHNT - Hemipneustes pyrenaicus - 1.jpg, Fossile of '' Hemipneustes pyrenaicus'' ( Hemipneustidae, Maastrichtian) Image:Echinosigra amphora.jpg, '' Echinosigra amphora'' ( Pourtalesiidae) This order seems to have appeared at the lower Cretaceous. List of families According to World Register of Marine Species : * Family Hemipneustidae (Lambert, 1917) †** genus '' Hemipneustes'' L. Agassiz, 1835 †** genus '' Medjesia'' Jeffery, 1997 †** genus '' Opisopneustes'' Gauthier, 1889 †... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pourtalesia Wandeli
''Pourtalesia'' is a genus of the family Pourtalesiidae which belongs to the irregular (bilaterally symmetrical) sea urchins. The animals measure 5–6 cm in length and live in the abyssal zone of the Atlantic, Pacific, Indopacific and Antarctic Oceans where they have been found in more than 3,000 m depth. The mouth opening of these animals is located anteriorly and the lantern of Aristotle is missing as typically for holasteroid sea urchins. Species Currently, 11 species of ''Pourtalesia'' are recognized. * '' Pourtalesia alcocki'' Koehler, 1914 * '' Pourtalesia aurorae'' Koehler, 1926 * '' Pourtalesia debilis'' Koehler, 1926 * '' Pourtalesia heptneri'' Mironov, 1978 * '' Pourtalesia hispida'' A. Agassiz, 1897 * '' Pourtalesia jeffreysi'' Thomson Thomson may refer to: Names * Thomson (surname), a list of people with this name and a description of its origin * Thomson baronets, four baronetcies created for persons with the surname Thomson Businesses and org ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pourtalesia Ceratopyga
''Pourtalesia'' is a genus of the family Pourtalesiidae which belongs to the irregular (bilaterally symmetrical) sea urchins. The animals measure 5–6 cm in length and live in the abyssal zone of the Atlantic, Pacific, Indopacific and Antarctic Oceans where they have been found in more than 3,000 m depth. The mouth opening of these animals is located anteriorly and the lantern of Aristotle is missing as typically for holasteroid sea urchins. Species Currently, 11 species of ''Pourtalesia'' are recognized. * '' Pourtalesia alcocki'' Koehler, 1914 * '' Pourtalesia aurorae'' Koehler, 1926 * '' Pourtalesia debilis'' Koehler, 1926 * '' Pourtalesia heptneri'' Mironov, 1978 * '' Pourtalesia hispida'' A. Agassiz, 1897 * '' Pourtalesia jeffreysi'' Thomson Thomson may refer to: Names * Thomson (surname), a list of people with this name and a description of its origin * Thomson baronets, four baronetcies created for persons with the surname Thomson Businesses and org ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pourtalesiidae
The pourtalesiids (Pourtalesiidae) are a family of irregular sea urchins that live in the deep sea. They are secondarily bilateral-symmetrical and like other representatives of the taxon Holasteroida they lack the lantern of Aristotle, which is typical for many other sea urchins. The genus '' Pourtalesia'' was named after Louis-François de Pourtalès who first collected these animals while dredging at a depth of 600 m. The family is known already from the Upper Cretaceous (Maastrichtian The Maastrichtian () is, in the ICS geologic timescale, the latest age (uppermost stage) of the Late Cretaceous Epoch or Upper Cretaceous Series, the Cretaceous Period or System, and of the Mesozoic Era or Erathem. It spanned the interval ...) and is distributed worldwide. Species and Genera Currently, there are 10 genera with 28 extant and 5 extinct species described. * genus '' Ceratophysa'' Pomel, 1883 ** '' Ceratophysa ceratopyga'' ( A. Agassiz, 1879) ** '' Ceratophysa rosea'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carnarechinidae
''Carnarechinus clypeatus'' is a species of sea urchins of the Holasteroida order. This species was described on the basis of fragmentary and poorly preserved material from Philippines, hence its taxonomic status is still unclear. Molecular phylogeny indicates it may be a basal member of the Urechinina. References Carnarechinusat the Natural History Museum A natural history museum or museum of natural history is a scientific institution with natural history collections that include current and historical records of animals, plants, fungi, ecosystems, geology, paleontology, climatology, and more. ... * Holasteroida Monotypic echinoderm genera Echinoidea genera {{echinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemipneustes
''Hemipneustes'' is an extinct genus of sea urchins belonging to the family Holasteridae. These semi-infaunal detritivores lived during the Upper Cretaceous period, from 70.6 to 66.043 million years ago. Fossils of this genus have been found in the sediments of Netherlands, Belgium, Bulgaria, India, Iran, the Netherlands, Oman and Spain. Description ''Hemipneustes'' is a quite large sea urchin Sea urchins () are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin live on the seabed of every ocean and inhabit every depth zone from the intertidal seashore down to . The spherical, hard shells (tests) of ... with a high-domed profile and a well-defined anterior sulcus. List of species * '' Hemipneustes africanus'' Deshayes In Agassiz & Desor, 1847 * '' Hemipneustes arabicus'' Ali, 1989 †* '' Hemipneustes arnaudi'' Cotteau, 1892 * '' Hemipneustes compressus'' Noetling, 1897 †* '' Hemipneustes cotteaui'' Lambert in Peron, 1887 †* '' Hemi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Toxopatagus
''Toxopatagus'' is an extinct genus of sea urchin Sea urchins () are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin live on the seabed of every ocean and inhabit every depth zone from the intertidal seashore down to . The spherical, hard shells (tests) of ...s. References Holasteroida {{paleo-echinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calymnidae
Calymnidae is a family of echinoderms belonging to the order Holasteroida Holasteroida is an order of irregular sea urchins. Characteristics These irregular sea urchins are characterized by a particularly marked bilateral symmetry, including for the apical system, which is highly elongated. In some contemporary ab .... Genera: * '' Calymne'' Thomson, 1877 * '' Chelonechinus'' Bather, 1934 * '' Pseudoffaster'' Lambert, 1924 * '' Sternopatagus'' de Meijere, 1903 References Holasteroida Echinoderm families {{echinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corystusidae
Corystusidae is a family of echinoderms belonging to the order Holasteroida Holasteroida is an order of irregular sea urchins. Characteristics These irregular sea urchins are characterized by a particularly marked bilateral symmetry, including for the apical system, which is highly elongated. In some contemporary ab .... Genera: * '' Cardabia'' Foster & Philip, 1978 * '' Corystus'' Pomel, 1883 * '' Galeraster'' * '' Huttonechinus'' Foster & Philip, 1978 References Holasteroida Echinoidea genera {{echinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urechinidae
Urechinidae is a family of echinoderms belonging to the order Holasteroida Holasteroida is an order of irregular sea urchins. Characteristics These irregular sea urchins are characterized by a particularly marked bilateral symmetry, including for the apical system, which is highly elongated. In some contemporary ab .... Genera: * '' Antrechinus'' Mooi & David, 1996 * '' Cystechinus'' A.Agassiz, 1879 * '' Pilematechinus'' A.Agassiz, 1904 * '' Urechinus'' A.Agassiz, 1879 References Holasteroida Echinoderm families {{echinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holasteridae
Holasteridae is an extinct family of sea urchins. These semi-infaunal detritivores lived during the Cretaceous The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of th ... period, from 140.2 to 53.0 Ma. Genera References Holasteroida {{paleo-echinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemipneustidae
''Hemipneustidae'' is an extinct family of sea urchins. Genera * ''Hemipneustes'' L. Agassiz, 1835 †* '' Medjesia'' Jeffery, 1997 †* '' Opisopneustes'' Gauthier, 1889 †* '' Plesiohemipneustes'' Smith & Wright, 2003 †* ''Toxopatagus ''Toxopatagus'' is an extinct genus of sea urchin Sea urchins () are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin live on the seabed of every ocean and inhabit every depth zone from the intertidal se ...'' Pomel, 1883 †References Holasteroida {{paleo-echinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemipneustes Pyrenaicus
''Hemipneustes'' is an extinct genus of sea urchins belonging to the family Holasteridae. These semi-infaunal detritivores lived during the Upper Cretaceous period, from 70.6 to 66.043 million years ago. Fossils of this genus have been found in the sediments of Netherlands, Belgium, Bulgaria, India, Iran, the Netherlands, Oman and Spain. Description ''Hemipneustes'' is a quite large sea urchin Sea urchins () are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin live on the seabed of every ocean and inhabit every depth zone from the intertidal seashore down to . The spherical, hard shells (tests) of ... with a high-domed profile and a well-defined anterior sulcus. List of species * '' Hemipneustes africanus'' Deshayes In Agassiz & Desor, 1847 * '' Hemipneustes arabicus'' Ali, 1989 †* '' Hemipneustes arnaudi'' Cotteau, 1892 * '' Hemipneustes compressus'' Noetling, 1897 †* '' Hemipneustes cotteaui'' Lambert in Peron, 1887 †* '' Hemi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |