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.
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| - Helicoplacoïdeus (ca)
- Helicoplacus (en)
- 螺板綱 (ja)
- Helicoplacus (pt)
- 海旋板屬 (zh)
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| - 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)
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| - Helicoplacus finds.svg (en)
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| - * Helicoplacus curtisi
* Helicoplacus guthi (en)
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| - 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)
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| - The contiguous United States are shaded in blue on this map of northern North America (en)
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