Helcionellid
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.
Helcionellid2013 in paleomalacology2014 in molluscan paleontology2015 in molluscan paleontology2016 in molluscan paleontology2019 in paleomalacologyBellerophontidaCarinopeltaChanges in the taxonomy of gastropods since 2005CoreospiridaeEotebennaEurekapegmaEvolution of cephalopodsEvolution of molluscsHelcionellaHelcionellaceaHelcionellidaHelcionellidaeHelcionellidsHelcionelliformesHelcionelloidHelcionelloidaHelcionelloidsLatouchellaMackinnoniaMolluscaMonoplacophoraOelandiaScenellaSmall shelly faunaStenothecidaeTotoraliaTrenellaTusk shell
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Helcionellid
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.
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Helcionellid or Helcionellifor ...... poda by Bouchet & Rocroi, 2005
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18,288,101
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label
Helcionellid
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authority
Geyer, 1994
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image caption
Latouchella costata restored as a gastropod
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subdivision
[[#2006-2007 taxonomy
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subdivision ranks
Subgroups
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synonyms
Helcionelliformes (Golikov & Starobogatov, 1975)
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taxon
Helcionelliformes
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subject
hypernym
comment
Helcionellid or Helcionellifor ...... lly fossils (SSF) assemblages.
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