Traits taxon details
original description
(of ) Steininger, J. (1853). Geognostische Beschreibung der Eifel. 144 pp. Lintz'sche Buchhandlung, Trier. [details]
basis of record
Schemm-Gregory, M. (2008). New interpretations of the phylogeny and taxonomy of delthyridoid spiriferids (Brachiopoda, Lower and Middle Devonian). <em>Bulletin of Geosciences.</em> 83(4): 401-448., available online at https://doi.org/10.3140/bull.geosci.2008.04.401 [details]
new combination reference
Boucot, A. J. (1975). Evolution and extinction rate controls. 427 pp. Elsevier, Amsterdam. [details]
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