Pelagiellidae is an extinctfamily of Paleozoicfossil '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]
Mineralogy
Aragonite, with various microstructures - details in reference [4]
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.
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^Knight J. B. 1956. New families of Gastropoda. Journal of the Washington Academy of Sciences 46(2): 41-42.
^ abKobayashi (20 March) 1962. Journal of the Faculty of Science, University of Tokyo, section 2 (Geology, Mineralogy, Geography, Geophysics), 14(1):17.
^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. S2CID239642828.
^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. ISBN3-925919-72-4. ISSN 0076-2997. 397 pp. http://www.vliz.be/Vmdcdata/imis2/ref.php?refid=78278