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Euchasma ✝

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Source Data

Source	ID	Link
Global Biodiversity Information Facility ID (GBIF)	4620754	https://www.gbif.org/species/4620754
PaleoBioDB ID (PBDB)	8156	https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=8156

Rank

genus

Taxonomy (GBIF)

Life : Animalia : Mollusca : Eopteriidae : Euchasma

Taxonomy (PBDB)

Life : Animalia : Mollusca : Rostroconchia : Conocardiida : Eopteriidae : Euchasma

Taxonomic Status (GBIF)

accepted

Classification
(PBDB,GBIF)

Rank	Name	Author
-	Eukaryota
-	Opisthokonta	Cavalier-Smith 1987
kingdom	Animalia
-	Bilateria
-	Eubilateria	Ax 1987
-	Protostomia	Grobben 1908
-	Spiralia
superphylum	Lophotrochozoa
phylum	Mollusca	Linnaeus 1758
class	Rostroconchia	Pojeta et al. 1972
order	Conocardiida
superfamily	Eopterioidea	Miller 1889
family	Eopteriidae	Miller 1889
genus	Euchasma	Billings 1865

Scientific Name

Euchasma Billings, 1865

Name Published In

Geol. Surv. Canada palaeoz. Foss., 1

Opinions (PBDB)

Name	Rank	Opinion	Evidence	Author
Euchasma	genus	belongs to Rostroconchia	stated with evidence	Pojeta et al., 1972
Euchasma	genus	belongs to Eopteriidae	stated with evidence	Pojeta and Runnegar, 1976
Euchasma	genus	belongs to Conocardioida	second hand	Sepkoski, 2002
Euchasma	genus	belongs to Euchasmidae	stated without evidence	Bouchet et al., 2010

Status (PBDB)

extinct

Taxon Size (PBDB)

First Recorded Appearance

501 - 499 Ma
Cambrian

Last Recorded Appearance

456 - 450 Ma
Late/Upper Ordovician

Motility

stationary (based on Rostroconchia)

Vision

blind (based on Rostroconchia)

Diet

suspension feeder (based on Rostroconchia)

Taphonomy

aragonite, low Mg calcite (based on Conocardiida)

Primary Reference (PBDB)

E. Billings. 1865. Palaeozoic fossils, volume 1. Geological Survey of Canada

Fossil Distribution

Subtaxa

Name	Status	Common Name(s)	Fossil Occurrences	Oldest	Youngest
Conocardium blumenbachium species	accepted (GBIF)	No associated record in PBDB
Euchasma blumenbachi ✝ species	listed (PBDB)		19	485 Ma Cambrian	478 Ma Early/Lower Ordovician
Euchasma caseyi ✝ species	accepted (GBIF) listed (PBDB)		12	485 Ma Cambrian	485 Ma Cambrian
Euchasma colliveri ✝ species	accepted (GBIF) listed (PBDB)		1	456 Ma Late/Upper Ordovician	456 Ma Late/Upper Ordovician
Euchasma eopteriformis ✝ species	accepted (GBIF) listed (PBDB)		1	485 Ma Cambrian	485 Ma Cambrian
Euchasma jonesi ✝ species	accepted (GBIF) listed (PBDB)		2	472 Ma Early/Lower Ordovician	472 Ma Early/Lower Ordovician
Euchasma multistriata ✝ species	listed (PBDB)		1	485 Ma Cambrian	485 Ma Cambrian
Euchasma mytiliforme ✝ species	accepted (GBIF) listed (PBDB)		2	472 Ma Early/Lower Ordovician	472 Ma Early/Lower Ordovician
Euchasma mytiliformis species	accepted (GBIF)	No associated record in PBDB
Euchasma shorinense species	accepted (GBIF)	No associated record in PBDB
Euchasma swarkoi ✝ species	accepted (GBIF) listed (PBDB)		6	477 Ma Early/Lower Ordovician	467 Ma Middle Ordovician
Euchasma wanwanense species	accepted (GBIF)	No associated record in PBDB
Euchasmella multistriata species	accepted (GBIF)	No associated record in PBDB

Synonymy List

Year	Name and Author
1865	Euchasma Billings
1933	Euchasmella Kobayashi
1972	Euchasma Pojeta, Jr. et al. p. 264
1976	Euchasma Pojeta and Runnegar p. 48
2002	Euchasma Sepkoski, Jr.
2002	Euchasmella Sepkoski, Jr.
2010	Euchasma Bouchet et al.

References

Billings E. Palaeozoic fossils, volume 1, Geological Survey of Canada, 1-426

Kobayashi T (1933) Faunal study of the Wanwanian (basal Ordovician) series with special notes on the Ribeiridae and the Ellesmereoceroids, Journal of the Faculty of Science Imperial University of Tokyo Section II Geology, Mineralogy, Geography, Seismology 3 7, 249-328

Pojeta, Jr. J., Runnegar B., et al (1972) Rostroconchia: a new class of bivalved mollusks, Science 177 4045, 264-267

Pojeta J., Runnegar B. (1976) The paleontology of rostroconch mollusks and the early history of the phylum Mollusca, United States Geological Survey Professional Paper 968, 1-88

Sepkoski, Jr. J. J. (2002) A compendium of fossil marine animal genera, Bulletins of American Paleontology 363, 1-560

Bouchet P., Rocroi J.-P., et al (2010) Nomenclator of Bivalve Families with a Classification of Bivalve Families, Malacologia 52 2, 1-184 doi:10.4002/040.052.0201

GBIF/Paleo Database - via The Interim Register of Marine and Nonmarine Genera

Nomenclator Zoologicus. A list of the names of genera and subgenera in zoology from the tenth edition of Linnaeus, 1758 to the end of 2004. Digitised by uBio from vols. 1-9 of Neave (ed.), 1939-1996 plus supplementary digital-only volume. http://ubio.org/NomenclatorZoologicus (as at 2006). - via The Interim Register of Marine and Nonmarine Genera

SN2000: Brands, S. J. (compiler) 1989-2005. Systema Naturae 2000. Amsterdam, The Netherlands (2006 version). Available online at http://sn2000.taxonomy.nl/. - via The Interim Register of Marine and Nonmarine Genera

Sepkoski, J. J., Jr. (2002). A compendium of fossil marine animal genera. Bulletins of American Paleontology. 363, 1-560. - via The Interim Register of Marine and Nonmarine Genera

Geol. Surv. Canada palaeoz. Foss., 1 - via The Interim Register of Marine and Nonmarine Genera

Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!

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