| dbo:abstract |
Els helicoplacoïdeus (Helicoplacoidea) són una classe extinta d'equinoderms de posició taxonòmica incerta. Van viure al Cambrià inferior. (ca) Helicoplacus (often misspelled Helioplacus) is the earliest well-studied fossil echinoderm. Fossil plates are known from several regions. Complete specimens were found in Lower Cambrian strata of the White Mountains of California. The animal was a cigar-shaped creature up to 7 centimetres (2.8 in) long that stood upright on one end. Unlike more typical echinoderms such as sea stars, Helicoplacus does not have fivefold symmetry. Instead, there is a spiral food groove on the outside along which food was moved to a mouth that is thought to be on the side. The respiratory system appears to be primitive. Although the animal does not look like a typical echinoderm, the plates are composed of the characteristic calcareous plates known as stereom that are common to all echinoderms. The ambulacrum is similar to that of the Edrioasteroidea; as a result, Helicoplacus may belong to Pelmatozoa. Other contemporaneous echinoderms are known to have existed from their dissociated plates, but other than a few possible edrioasteroids, Helicoplacus is the earliest echinoderm that is well enough preserved to analyze its characteristics. One much earlier form called Arkarua has been hypothesized to be an ancestral echinoderm because of its fivefold symmetry. But Arkarua appears to lack both stereoms and a mouth. Helicoplacus fossils date back to the Lower Cambrian, around 525 million years ago. Helicoplacus is thought to have been a suspension feeder living at moderate depths in highly oxygenated water with strong enough currents to ensure a steady food supply. It is typically found in greenish shales and, rarely found in shallow water sandstones and limestones. The helically spiraling rows of plates radiating from the base, which in life probably was anchored in the muddy substrate. (en) 螺板綱 (らはんこう、Helicoplacoidea) は、絶滅した棘皮動物の分類群の一つ。カンブリア紀前期に生息していた。 (ja) Helicoplacus é um género extinto de equinodermes apenas conhecido a partir do seu registo fóssil. Placas fossilizadas são conhecidas a partir de várias regiões. Exemplares completos foram encontrados em estratos geológcos datados do Cambriano em Lower, nas Montanhas Brancas da Califórnia. (pt) 海旋板屬（學名：Helicoplacus）是一类形態特殊的已灭绝棘皮动物，是海旋板綱下的模式屬。生存在寒武纪早期的海洋中。 (zh) |
| dbo:thumbnail |
wiki-commons:Special:FilePath/Helicoplacus.jpg?width=300 |
| dbo:wikiPageExternalLink |
http://www.usna.edu/Users/oceano/pguth/website/pl00001.htm |
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4282 (xsd:nonNegativeInteger) |
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| dbo:wikiPageWikiLink |
dbr:California dbr:Cambrian dbr:Early_Cambrian dbr:Limestone dbr:Sea_star dbr:Stem_group dbr:Stratum dbr:Helicocystis dbr:Pelmatozoa dbr:Edrioasteroidea dbc:Prehistoric_Echinozoa_genera dbr:Fossil dbr:Arkarua dbc:Cambrian_genus_extinctions dbc:Prehistoric_echinoderms_of_North_America dbc:Cambrian_echinoderms dbr:Echinodermata dbr:Sandstone dbr:Shale dbc:Helicoplacoidea dbr:Stereom dbr:List_of_echinodermata_orders dbr:List_of_prehistoric_echinoderms |
| dbp:imageCaption |
Helicoplacus guthi (en) |
| dbp:rangeMap |
Helicoplacus finds.svg (en) |
| dbp:rangeMapAlt |
The contiguous United States are shaded in blue on this map of northern North America (en) |
| dbp:subdivision |
* Helicoplacus curtisi * Helicoplacus guthi (en) |
| dbp:subdivisionRanks |
Species (en) |
| dbp:taxon |
Helicoplacus (en) |
| dbp:wikiPageUsesTemplate |
dbt:Automatic_taxobox dbt:Convert dbt:Legend dbt:Reflist dbt:Short_description dbt:Taxonbar dbt:Fossil_range dbt:Mya dbt:Paleo-echinoderm-stub dbt:Early_Echinoderms_graphical_timeline |
| dcterms:subject |
dbc:Prehistoric_Echinozoa_genera dbc:Cambrian_genus_extinctions dbc:Prehistoric_echinoderms_of_North_America dbc:Cambrian_echinoderms dbc:Helicoplacoidea |
| gold:hypernym |
dbr:Echinoderm |
| rdf:type |
dbo:Animal yago:WikicatCambrianAnimals yago:Animal100015388 yago:Echinoderm102316707 yago:Invertebrate101905661 yago:LivingThing100004258 yago:Object100002684 yago:Organism100004475 yago:PhysicalEntity100001930 yago:Whole100003553 yago:WikicatEchinoderms yago:WikicatExtinctAnimals yago:WikicatPrehistoricInvertebrates umbel-rc:Animal umbel-rc:BiologicalLivingObject umbel-rc:EukaryoticCell |
| rdfs:comment |
Els helicoplacoïdeus (Helicoplacoidea) són una classe extinta d'equinoderms de posició taxonòmica incerta. Van viure al Cambrià inferior. (ca) 螺板綱 (らはんこう、Helicoplacoidea) は、絶滅した棘皮動物の分類群の一つ。カンブリア紀前期に生息していた。 (ja) Helicoplacus é um género extinto de equinodermes apenas conhecido a partir do seu registo fóssil. Placas fossilizadas são conhecidas a partir de várias regiões. Exemplares completos foram encontrados em estratos geológcos datados do Cambriano em Lower, nas Montanhas Brancas da Califórnia. (pt) 海旋板屬（學名：Helicoplacus）是一类形態特殊的已灭绝棘皮动物，是海旋板綱下的模式屬。生存在寒武纪早期的海洋中。 (zh) Helicoplacus (often misspelled Helioplacus) is the earliest well-studied fossil echinoderm. Fossil plates are known from several regions. Complete specimens were found in Lower Cambrian strata of the White Mountains of California. Helicoplacus fossils date back to the Lower Cambrian, around 525 million years ago. (en) |
| rdfs:label |
Helicoplacoïdeus (ca) Helicoplacus (en) 螺板綱 (ja) Helicoplacus (pt) 海旋板屬 (zh) |
| owl:sameAs |
freebase:Helicoplacus yago-res:Helicoplacus wikidata:Helicoplacus dbpedia-ca:Helicoplacus dbpedia-ja:Helicoplacus dbpedia-pt:Helicoplacus dbpedia-zh:Helicoplacus https://global.dbpedia.org/id/T4R4 |
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wikipedia-en:Helicoplacus?oldid=1103114498&ns=0 |
| foaf:depiction |
wiki-commons:Special:FilePath/Helicoplacus.jpg wiki-commons:Special:FilePath/Helicoplacus_finds.svg |
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wikipedia-en:Helicoplacus |
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dbr:Helioplacus |
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dbr:Cambrian_substrate_revolution dbr:List_of_prehistoric_echinoderm_genera dbr:Cincta dbr:Helicoplacoidea dbr:Yorkicystis dbr:List_of_the_Paleozoic_life_of_California dbr:List_of_the_prehistoric_life_of_California dbr:Helioplacus |
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wikipedia-en:Helicoplacus |
