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Plagiochasma (echinoderm)
''Plagiochasma'' is an extinct echinoderm genus in the family Pygaulidae. Species includes: * '' Plagiochasma cruciferum'' (Morton, 1830); Paleocene of Denmark, Belgium, The Netherlands, Trinidad and the United States * '' Plagiochasma faringdonense'' (Wright, 1875); Lower Greensand, Upper Aptian, Early Cretaceous of UK * '' Plagiochasma olfersii'' (L. Agassiz, 1836); Hauterivian, Early Cretaceous of France and Switzerland * '' Plagiochasma saurai'' Forner i Valls, 2016; Barremian, Early Cretaceous of Spain * '' Plagiochasma texanum'' Smith & Rader, 2009; Lower Albian, Texas, USA See also * List of prehistoric echinoderms * List of prehistoric echinoids References Prehistoric echinoderm genera Prehistoric life of Europe Fossils of Greenland {{paleo-echinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animalia
Animals are multicellular, eukaryotic organisms in the biological kingdom Animalia. With few exceptions, animals consume organic material, breathe oxygen, are able to move, can reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of cells, the blastula, during embryonic development. Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from to . They have complex interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology. Most living animal species are in Bilateria, a clade whose members have a bilaterally symmetric body plan. The Bilateria include the protostomes, containing animals such as nematodes, arthropods, flatworms, annelids and molluscs, and the deuterostomes, containing the echinode ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echinodermata
An echinoderm () is any member of the phylum Echinodermata (). The adults are recognisable by their (usually five-point) radial symmetry, and include starfish, brittle stars, sea urchins, sand dollars, and sea cucumbers, as well as the sea lilies or "stone lilies". Adult echinoderms are found on the sea bed at every ocean depth, from the intertidal zone to the abyssal zone. The phylum contains about 7,000 living species, making it the second-largest grouping of deuterostomes, after the chordates. Echinoderms are the largest entirely marine phylum. The first definitive echinoderms appeared near the start of the Cambrian. The echinoderms are important both ecologically and geologically. Ecologically, there are few other groupings so abundant in the biotic desert of the deep sea, as well as shallower oceans. Most echinoderms are able to reproduce asexually and regenerate tissue, organs, and limbs; in some cases, they can undergo complete regeneration from a single limb. Geolo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echinoidea
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 sea urchins are round and spiny, ranging in diameter from . Sea urchins move slowly, crawling with tube feet, and also propel themselves with their spines. Although algae are the primary diet, sea urchins also eat slow-moving (sessile) animals. Predators that eat sea urchins include a wide variety of fish, starfish, crabs, marine mammals. Sea urchins are also used as food especially in Japan. Adult sea urchins have fivefold symmetry, but their pluteus larvae feature bilateral (mirror) symmetry, indicating that the sea urchin belongs to the Bilateria group of animal phyla, which also comprises the chordates and the arthropods, the annelids and the molluscs, and are found in every ocean and in every climate, from the tropics to the polar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Irregularia
Irregularia is an extant infraclass of sea urchins that first appeared in the Lower Jurassic. Description and characteristics These particular sea urchins are distinguished from other sea urchins by their irregular shape: the anus and often even the mouth are no more at the two poles of the test, creating a bilateral symmetry instead of the classical 5-fold symmetry of echinoderms. The group includes the well known heart urchins, as well as flattened sand dollars, sea biscuits and some other forms. Most of them live inside the sediment, moving in thanks to their particular spines, and feed on its organic fraction. Image:Heart urchin Spatangoida 1380049 Nevit.jpg, Image:Echinocyamus pusillus.jpg, Image:Keyhole sand dollar 01.jpg, Image:Live Sand Dollar trying to bury itself in beach sand.jpg, Image:Clypeaster reticulatus both sides.jpg, Image:Encope emarginata (Leske, 1778) derivate 2013.jpg, Image :Clypeaster rosaceus (Linnaeus, 1758) derivate 2013.jpg, Image:Clyp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Auguste Pomel
Nicolas Auguste Pomel (20 September 1821 – 2 August 1898) was a French geologist, paleontologist and botanist. He worked as a mines engineer in Algeria and became a specialist in north African vertebrate fossils. He was Senator of Algeria for Oran from 1876 to 1882. Life Nicolas-Auguste Pomel was born in Issoire, Puy-de-Dôme, on 20 September 1821. He studied at the Lycée de Clermont and earned his Licence ès sciences. He was conscripted into the army when he was prepared to enter the École des mines. He became a civil engineer after being released. After the coup d'état of 2 December 1851 his Republican beliefs earned him deportation. He became a ''Garde des mines'' in Oran in 1866, and was promoted to the 1st class in 1872. From 1876 to 1882 he was member of the Senate (Oran division). In 1882 he was tasked with geological mapping of Algeria. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plagiochasma Cruciferum
''Plagiochasma'' may refer to: * ''Plagiochasma'' (echinoderm), an extinct echinoderm genus in the family Pygaulidae * ''Plagiochasma'' (plant), a plant genus in the family Aytoniaceae {{genus disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plagiochasma Faringdonense
''Plagiochasma'' may refer to: * ''Plagiochasma'' (echinoderm), an extinct echinoderm genus in the family Pygaulidae * ''Plagiochasma'' (plant), a plant genus in the family Aytoniaceae {{genus disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plagiochasma Olfersii
''Plagiochasma'' may refer to: * ''Plagiochasma'' (echinoderm), an extinct echinoderm genus in the family Pygaulidae * ''Plagiochasma'' (plant), a plant genus in the family Aytoniaceae {{genus disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plagiochasma Saurai
''Plagiochasma'' may refer to: * ''Plagiochasma'' (echinoderm), an extinct echinoderm genus in the family Pygaulidae * ''Plagiochasma'' (plant), a plant genus in the family Aytoniaceae {{genus disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plagiochasma Texanum
''Plagiochasma'' may refer to: * ''Plagiochasma'' (echinoderm), an extinct echinoderm genus in the family Pygaulidae * ''Plagiochasma'' (plant), a plant genus in the family Aytoniaceae {{genus disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Prehistoric Echinoderms
This list of prehistoric echinoderms is an attempt to create a comprehensive listing of all genera that have ever been included in the Echinoderms that have been preserved as fossils. This list excludes purely vernacular terms. It includes all commonly accepted genera, but also genera that are now considered invalid, doubtful (''nomina dubia''), or were not formally published (''nomina nuda''), as well as junior synonyms of more established names, and genera that are no longer considered echinoderms. The list includes thousands of genera. *Extinct genera are marked with a dagger ( †). *Extant genera are bolded. Naming conventions and terminology Naming conventions and terminology follow the International Code of Zoological Nomenclature. Technical terms used include: * Junior synonym: A name which describes the same taxon as a previously published name. If two or more genera are formally designated and the type specimens are later assigned to the same genus, the first to be pub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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