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- Helicoplacus abstract "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, Helicoplacoidea 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.Helicoplacoids seem to have existed for about 15 million years in the Lower Cambrian, around 525 million years ago.Helicoplacoids are thought to have been suspension feeders living at moderate depths in highly oxygenated water with strong enough currents to ensure a steady food supply. They are typically found in greenish shales and are rarely found in shallow water sandstones and limestones. See also List of echinodermata orders.".
- Helicoplacus class Helicoplacus.
- Helicoplacus kingdom Animal.
- Helicoplacus phylum Echinoderm.
- Helicoplacus thumbnail Helicoplacus.jpg?width=300.
- Helicoplacus wikiPageExternalLink pl00001.htm.
- Helicoplacus wikiPageID "220817".
- Helicoplacus wikiPageLength "3471".
- Helicoplacus wikiPageOutDegree "21".
- Helicoplacus wikiPageRevisionID "680633956".
- Helicoplacus wikiPageWikiLink Animal.
- Helicoplacus wikiPageWikiLink Arkarua.
- Helicoplacus wikiPageWikiLink California.
- Helicoplacus wikiPageWikiLink Cambrian.
- Helicoplacus wikiPageWikiLink Category:Cambrian_echinoderms.
- Helicoplacus wikiPageWikiLink Category:Prehistoric_animals_of_North_America.
- Helicoplacus wikiPageWikiLink Crown_group.
- Helicoplacus wikiPageWikiLink Early_Cambrian.
- Helicoplacus wikiPageWikiLink Echinoderm.
- Helicoplacus wikiPageWikiLink Echinodermata.
- Helicoplacus wikiPageWikiLink Edrioasteroidea.
- Helicoplacus wikiPageWikiLink Fossil.
- Helicoplacus wikiPageWikiLink Helicoplacoidea.
- Helicoplacus wikiPageWikiLink Helicoplacus.
- Helicoplacus wikiPageWikiLink Limestone.
- Helicoplacus wikiPageWikiLink List_of_echinodermata_orders.
- Helicoplacus wikiPageWikiLink Pelmatozoa.
- Helicoplacus wikiPageWikiLink Sandstone.
- Helicoplacus wikiPageWikiLink Sea_star.
- Helicoplacus wikiPageWikiLink Shale.
- Helicoplacus wikiPageWikiLink Starfish.
- Helicoplacus wikiPageWikiLink Stem_group.
- Helicoplacus wikiPageWikiLink Stereom.
- Helicoplacus wikiPageWikiLink Stratum.
- Helicoplacus wikiPageWikiLinkText "Helicoplacus".
- Helicoplacus wikiPageWikiLinkText "Helioplacoidea".
- Helicoplacus wikiPageWikiLinkText "helicoplacoids".
- Helicoplacus classis "†Helicoplacoidea".
- Helicoplacus genus "Helicoplacus".
- Helicoplacus hasPhotoCollection Helicoplacus.
- Helicoplacus imageCaption "Helicoplacus guthi".
- Helicoplacus phylum Echinoderm.
- Helicoplacus phylum Echinodermata.
- Helicoplacus rangeMap "Helicoplacus finds.svg".
- Helicoplacus rangeMapAlt "The contiguous United States are shaded in blue on this map of northern North America".
- Helicoplacus regnum "Animalia".
- Helicoplacus subdivision "* Helicoplacus curtisi * Helicoplacus guthi".
- Helicoplacus subdivisionRanks "Species".
- Helicoplacus wikiPageUsesTemplate Template:Citation_needed.
- Helicoplacus wikiPageUsesTemplate Template:Convert.
- Helicoplacus wikiPageUsesTemplate Template:Early_Echinoderms_graphical_timeline.
- Helicoplacus wikiPageUsesTemplate Template:Mya.
- Helicoplacus wikiPageUsesTemplate Template:Paleo-echinoderm-stub.
- Helicoplacus wikiPageUsesTemplate Template:Reflist.
- Helicoplacus wikiPageUsesTemplate Template:Taxobox.
- Helicoplacus subject Category:Cambrian_echinoderms.
- Helicoplacus subject Category:Prehistoric_animals_of_North_America.
- Helicoplacus hypernym Echinoderm.
- Helicoplacus type Animal.
- Helicoplacus type Article.
- Helicoplacus type Eukaryote.
- Helicoplacus type Species.
- Helicoplacus type Article.
- Helicoplacus type Invertebrate.
- Helicoplacus type Organism.
- Helicoplacus type Organism.
- Helicoplacus type Thing.
- Helicoplacus type Q19088.
- Helicoplacus type Q729.
- Helicoplacus comment "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.".
- Helicoplacus label "Helicoplacus".
- Helicoplacus sameAs Helicoplacoïdeu.
- Helicoplacus sameAs Helicoplacoidea.
- Helicoplacus sameAs Helicoplacoidea.
- Helicoplacus sameAs Helicoplacoidea.
- Helicoplacus sameAs 螺板綱.
- Helicoplacus sameAs Helicoplacoidea.
- Helicoplacus sameAs m.01g7x_.
- Helicoplacus sameAs Q143851.
- Helicoplacus sameAs Q143851.
- Helicoplacus sameAs 海旋板.
- Helicoplacus wasDerivedFrom Helicoplacus?oldid=680633956.
- Helicoplacus depiction Helicoplacus.jpg.
- Helicoplacus isPrimaryTopicOf Helicoplacus.