Pelagiellidae

Pelagiellidae is an extinct family of Paleozoic fossil 'snails'. Some material assigned to this taxon represents gastropod molluscs, but some chaeta-bearing specimens first assigned to Pelagiella (now Pseudopelagiella) are perhaps better interpreted as tube-bearing annelid worms.^[3]

Pelagiellidae
Drawing of the apical, apertural and basal view of Pelagiella atlantoides.
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	†Helcionelloida
Order:	†Pelagielliformes
Family:	†Pelagiellidae Knight, 1956[1]
Genera
See text
Synonyms
Proeccyliopteridae Kobayashi, 1962 (n.a.)[2] Protoscaevogyridae Kobayashi, 1962 (n.a.)[2]

Mineralogy

Aragonite, with various microstructures - details in reference ^[4]

Taxonomy

The taxonomy of the Gastropoda by Bouchet & Rocroi, 2005^[5] categorizes Pelagiellidae in the superfamilia Pelagielloidea within the Paleozoic molluscs of uncertain systematic position. This family has no subfamilies.

According to P. Yu. Parkhaev, the family Pelagiellidae is in the order Pelagiellifomes MacKinnon, 1985 within the subclass Archaeobranchia Parkhaev, 2001, in the class Helcionelloida Peel, 1991.

Genera

Genera in the family Pelagiellidae include:

• Pelagiella Matthew, 1895^[6] - type genus of the family Pelagiellidae
  • Pelagiella atlantoides - synonym: Cyrtolithes atlantoides
  • Pelagiella emeishanensis - image
• Proeccyliopterus Kobayashi, 1962
• Protoscaevogyra Kobayashi, 1939
• Cambretina Horný, 1964
• Costipelagiella Horný, 1964

References

1. Knight J. B. 1956. New families of Gastropoda. Journal of the Washington Academy of Sciences 46(2): 41-42.
2. Kobayashi (20 March) 1962. Journal of the Faculty of Science, University of Tokyo, section 2 (Geology, Mineralogy, Geography, Geophysics), 14(1):17.
3. Landing, Ed; Geyer, Gerd; Jirkov, Igor A.; Schiaparelli, Stefano (2021). "Lophotrochozoa in the Cambrian evolutionary radiation and the Pelagiella problem". Papers in Palaeontology. 7 (4): 2227–2244. Bibcode:2021PPal....7.2227L. doi:10.1002/spp2.1396. S2CID 239642828.
4. Li, Guoxiang; Yun, Hao; Zhang, Xingliang; Li, Luoyang (2017-05-16). "Complex hierarchical microstructures of Cambrian mollusk Pelagiella : Insight into early biomineralization and evolution". Scientific Reports. 7 (1): 1935. Bibcode:2017NatSR...7.1935L. doi:10.1038/s41598-017-02235-9. PMC 5434049. PMID 28512325.
5. Bouchet P. & Rocroi J.-P. (Ed.); Frýda J., Hausdorf B., Ponder W., Valdés Á. & Warén A. 2005. Classification and nomenclator of gastropod families. Malacologia: International Journal of Malacology, 47(1-2). ConchBooks: Hackenheim, Germany. ISBN 3-925919-72-4. ISSN 0076-2997. 397 pp. http://www.vliz.be/Vmdcdata/imis2/ref.php?refid=78278
6. Matthew G.F. 1895. The Protolenus fauna. Transactions of the New York Academy of Sciences 14: 101-153. Pelagiella on the page 131. Plate VI., figure 6 a-c.