This dataset contains the digitized treatments in Plazi based on the original journal article Ernst, Andrej, Claussen, Anna Lene, Seuss, Barbara, Wyse Jackson, Patrick N. (2022): Stenolaemate bryozoans from the Graham Formation, Pennsylvanian (Virgilian) at Lost Creek Lake, Texas, USA. Palaeontologia Electronica (a 15) 25 (2): 1-56, DOI: 10.26879/1174, URL: http://dx.doi.org/10.26879/1174
ABSTRACT
An exceptionally well-preserved bryozoan fauna has been described from the Finis Shale Member, Graham Formation, Pennsylvanian (Virgilian) at Lost Creek Lake, Texas, USA. Nineteen bryozoan species (four cystoporates, one trepostome, two rhabdomesine cryptostomes, and 12 fenestrates) have been identified in two profiles which cut the most vertical range, at the level of the outcrop-base, of the Finis Shale. Two species are new: a trepostome Dyscritella felixi n. sp. and a fenestrate Laxifenestella texana n. sp. The fauna was studied on a combined basis of external and internal morphology, using a SEM and thin sections, respectively. Bryozoans from the Finis Shale Member exhibit a variety of growth forms from encrusting unilaminar, erect ramose, erect reticulate robust, and erect reticulate delicate, to erect pinnate morphologies. The erect growth forms clearly dominate, and bryozoans become more robust in the upper level of the profiles. The distribution pattern of bryozoan growth forms indicates gradual shallowing in the profiles supporting the assumption of a transgressive-regressive cycle in the Finis Shale. Bryozoan richness, abundance, and α-diversity increase toward the top of the profiles. Palaeobiogeographic relations of the Finis Shale bryozoans are mostly restricted to the American realm, with some connections to the Pennsylvanian of Europe.
Andrej Ernst. Institut für Geologie, Universität Hamburg, Bundesstr. 55, 20146 Hamburg, Germany. Andrej.Ernst@uni-hamburg.de
Anna Lene Claussen. GeoZentrum Nordbayern, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Loewenichstrasse 28, D-91054 Erlangen, Germany. anna.lene.claussen@fau.de
Barbara Seuss. GeoZentrum Nordbayern, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Loewenichstrasse 28, D-91054 Erlangen, Germany. barbara.seuss@fau.de
Patrick N. Wyse Jackson. Department of Geology, Trinity College, Dublin 2, Ireland. wysjcknp@tcd.ie
http://zoobank.org/ A4A07D50-3DDB-4E45-A255-1ECCF45F147A
Keywords: Finis Shale; cyclothem; North American Midcontinent; morphology; taxonomy; ecology
Submission: 1 July 2021. Acceptance: 29 April 2022.
Ernst A, Claussen A L, Seuss B, Wyse Jackson P N, felipe (2022). Stenolaemate bryozoans from the Graham Formation, Pennsylvanian (Virgilian) at Lost Creek Lake, Texas, USA. Plazi.org taxonomic treatments database. Checklist dataset https://doi.org/10.15468/baaezv accessed via GBIF.org on 2026-06-14.
