| dbo:abstract |
Helcionellid or Helcionelliformes is an order of small fossil shells that are universally interpreted as molluscs, though no sources spell out why this taxonomic interpretation is preferred. These animals are first found about 540 to 530 million years ago in the late Nemakit-Daldynian age, which is the earliest part of the Cambrian period. A single species persisted to the Early Ordovician. These fossils are component of the small shelly fossils (SSF) assemblages. These are thought to be early molluscs with rather snail-like shells, although they lack any compelling molluscan synapomorphies and thus may not belong to the group. They have been alleged to represent ancestors of the modern conchiferans, a group that includes all the well-known modern classes – gastropods, cephalopods and bivalves. They have also been considered to represent direct ancestors to the cephalopods. Parkhaev (2006, 2007) considers these animals to be crown-group gastropods. Previous to the 2006 classification by Parkhaev, helcionellids were classified within the separate class Helcionelloida or as "Uncertain position (Gastropoda or Monoplacophora)" within "Paleozoic molluscs of uncertain systematic position" according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005 (en) |
| dbo:thumbnail |
wiki-commons:Special:FilePath/Latouchella_costata.jpg?width=300 |
| dbo:wikiPageExternalLink |
https://web.archive.org/web/20080930105735/http:/www.palaeos.com/Invertebrates/Molluscs/BasalMollusca/Conchifera/Helcionelloida.html |
| dbo:wikiPageID |
18288101 (xsd:integer) |
| dbo:wikiPageLength |
12948 (xsd:nonNegativeInteger) |
| dbo:wikiPageRevisionID |
1117338733 (xsd:integer) |
| dbo:wikiPageWikiLink |
dbr:Cambrian dbr:Early_Ordovician dbr:Limpet dbr:Geologic_time_scale dbr:Mollusc dbr:Bivalves dbr:Conchifera dbr:Coreospiridae dbr:Small_shelly_fauna dbr:Stenothecidae dbr:Gastropods dbr:Cephalopods dbr:Fossil dbr:Taxonomy_of_the_Gastropoda_(Bouchet_&_Rocroi,_2005) dbr:Helcionelloida dbc:Helcionelloida dbr:Latouchella dbr:Order_(biology) dbr:Yochelcionelloidea dbr:Snail dbr:Trenellidae dbr:Helcionellidae dbr:Helcionelliformes dbr:Small_shelly_fossils dbr:Yochelcionellidae dbr:Carinopeltidae dbr:Nemakit-Daldynian dbr:Archaeobranchia dbr:Helcionelloidea dbr:Stenothecinae dbr:Watsonellinae dbr:File:Yochelcionella_water_flow.png |
| dbp:authority |
Geyer, 1994 (en) |
| dbp:imageCaption |
Latouchella costata restored as a gastropod (en) |
| dbp:subdivision |
[[#2006-2007 taxonomy (en) |
| dbp:subdivisionRanks |
Subgroups (en) |
| dbp:synonyms |
Helcionelliformes (Golikov & Starobogatov, 1975) (en) |
| dbp:taxon |
Helcionelliformes (en) |
| dbp:wikiPageUsesTemplate |
dbt:Automatic_taxobox dbt:Convert dbt:Reflist dbt:Short_description dbt:Taxonbar dbt:Verify_source dbt:Fossil_range dbt:Ma |
| dcterms:subject |
dbc:Helcionelloida |
| gold:hypernym |
dbr:Shells |
| rdf:type |
dbo:Mollusca umbel-rc:Mollusk |
| rdfs:comment |
Helcionellid or Helcionelliformes is an order of small fossil shells that are universally interpreted as molluscs, though no sources spell out why this taxonomic interpretation is preferred. These animals are first found about 540 to 530 million years ago in the late Nemakit-Daldynian age, which is the earliest part of the Cambrian period. A single species persisted to the Early Ordovician. These fossils are component of the small shelly fossils (SSF) assemblages. (en) |
| rdfs:label |
Helcionellid (en) |
| owl:sameAs |
freebase:Helcionellid wikidata:Helcionellid dbpedia-bg:Helcionellid https://global.dbpedia.org/id/4m3WE |
| prov:wasDerivedFrom |
wikipedia-en:Helcionellid?oldid=1117338733&ns=0 |
| foaf:depiction |
wiki-commons:Special:FilePath/Latouchella_costata.jpg wiki-commons:Special:FilePath/Yochelcionella_water_flow.png |
| foaf:isPrimaryTopicOf |
wikipedia-en:Helcionellid |
| is dbo:wikiPageRedirects of |
dbr:Helcionellids dbr:Helcionellida dbr:Helcionellidae dbr:Helcionelliformes dbr:Helcionelloid dbr:Helcionelloids |
| is dbo:wikiPageWikiLink of |
dbr:Scenella dbr:2021_in_paleomalacology dbr:2022_in_paleomalacology dbr:Eotebenna dbr:Mollusca dbr:Small_shelly_fauna dbr:Totoralia dbr:Tusk_shell dbr:Evolution_of_cephalopods dbr:Evolution_of_molluscs dbr:2014_in_molluscan_paleontology dbr:2015_in_molluscan_paleontology dbr:2016_in_molluscan_paleontology dbr:Helcionella dbr:2019_in_paleomalacology dbr:Latouchella dbr:Helcionellids dbr:Eurekapegma dbr:Oelandia dbr:Helcionellida dbr:Helcionellidae dbr:Helcionelliformes dbr:Helcionelloid dbr:Helcionelloids |
| is gold:hypernym of |
dbr:Protowenella dbr:Eotebenna dbr:Totoralia dbr:Helcionella dbr:Tannuella dbr:Lamaureriella dbr:Eurekapegma dbr:Tichkaella |
| is foaf:primaryTopic of |
wikipedia-en:Helcionellid |
