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Extinct genus of marine invertebrates
Helicoplacus (often misspelled Helioplacus) is the earliest well-studied fossil echinoderm. Fossil plates are known from several regions. Complete specimens
Helicoplacus
Extinct class of echinoderms
†Helicoplacidae †Helicoplacus Durham & Caster, 1963 †Polyplacus Durham, 1967 †Waucobella Durham, 1967 Helicoplacus guthi, one of two species of Helicoplacus, was
Helicoplacoidea
Superphylum of bilateral animals
3 of the Cambrian, 521 million years ago starting with forms such as Helicoplacus. Two other Cambrian Stage 3 (521-514 mya) species, Haikouichthys and
Deuterostome
Marine phylum of animals often with radial symmetries
Coleicarpus† (a Solute† a.k.a. Homoiostelean†) ? Ceratocystis† (a Stylophoran†) Helicoplacus† (a Helicoplacoid†) Helicocystis† Echinodermata Gogia† (an Eocrinoid†)
Echinoderm
Extinct class of marine invertebrates
Pterobranchia Enteropneusta Echinodermata Ctenocystoidea Cincta Soluta Helicoplacus Camptostroma Stromatocystites Kinzercystis Gogia Akadocrinus Pleurocystites
Cincta
not, in fact, be such structures. No known orders, 2 known species, Helicoplacus curtisi and H. guthi Order Coronata † Order Fissiculata † Order Spiraculata
List_of_echinoderm_orders
applegatei – type locality for species †Heintzella playfordi †Helicoplacus †Helicoplacus gilberti †Helicoprion †Helicoprion davisii †Helicotoma †Helicotoma
List of the Paleozoic life of California
List_of_the_Paleozoic_life_of_California
Geological unit located in eastern California and Nevada
Genus Species Notes Images Helicoplacus Helicoplacus sp. H. gilberti Oblong echinoderm. Eocystites Eocystites sp. Echinoderm.
Poleta_Formation
Geologic formation in Nevada, United States
Genus Species Notes Images Helicoplacus Helicoplacus sp. Oblong echinoderm. Isolated plates Eocrinoidea (?) Isolated plates, possibly of eocrinoid origin
Campito_Formation
Geologic formation in the northern Mojave Desert
Genus Species Notes Images Helicoplacus H. gilberti Oblong echinoderm.
Wood_Canyon_Formation
Extinct genus of marine invertebrates
Placement of Yorkicystis Echinodermata Helicoplacus Helicocystis Stromatocystites Titanocrinus Apektocrinus Lepidocystis Vyscystis Ridersia Gogia Argodiscus
Yorkicystis
report †Euomphalus †Fallotaspis †Favosites †Fenestella †Gogia †Halysites †Helicoplacus †Helicoprion †Helicoprion davisii †Heliomeroides †Hercynella †Holopea
List of the prehistoric life of California
List_of_the_prehistoric_life_of_California
†Helfriedella †Helianthaster †Heliaster †Helicocrinus †Helicocystis †Helicoplacus †Heliocidaris †Heliocrinites †Heliophora †Heliosocrinus †Helodiadema
List of prehistoric echinoderm genera
List_of_prehistoric_echinoderm_genera
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