MolluscaBase taxon details
original description
(of Spiratella gruendeli Tembrock, 1989 †) Tembrock, M. L. (1989). Neue Spiratella-Arten (Gastropoda, Opisthobranchier, Pteropoda). <em>Zeitschrift fur Angewandte Geologie.</em> 35 (8): 242-244. [details]
original description
(of Valvatina umbilicata Bornemann, 1855 †) Bornemann, J. G. (1855). Die mikroskopische Fauna des Septarienthones von Hermsdorf bei Berlin. <em>Zeitschrift der Deutschen Geologischen Gesellschaft.</em> 7: 307-371., available online at https://biodiversitylibrary.org/page/34850378 [details]
basis of record
Janssen, A. W. (1990). Long distance correlation of Cainozoic deposits by means of planktonic gastropods ("pteropods"); some examples of future possibilities. <em>Tertiary Research.</em> 11 (2-4): 65-72. [details]
additional source
Janssen, A. W. (1991). Biostratigraphic application of 'Pteropoda' (Gastropoda, Euthecosomata) in Cainozoic deposits of the North Sea Basin and interregional correlations. <em>Proceedings of the Tenth International Malacological Congress (Tubingen 1989).</em> 489-492. [details]
additional source
Garvie, C. L.; Goedert, J. L.; Janssen, A. W. (2020). Paleogene and Late Cretaceous Pteropoda (Mollusca, Gastropoda, Heterobranchia) from North America. <em>Zootaxa.</em> 4782(1): 1-115., available online at https://doi.org/10.11646/zootaxa.4782.1.1
page(s): 46 [details]