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Dyscritella

Dyscritella

Girty, 1911

GBIF:226325004

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ABOUT

Descriptions(3)

Diagnosis. Ramose and encrusting colonies with abundant acanthostyles and exilazooecia. Autozooecia parallel to longitudinal direction of the colony in endozone; gradually bending outward in exozone. Diaphragms in autozooecia lacking or very rare; lacking in exilazooecia. Exilazooecia circular to angular in cross section and separated from the autozooecia and from each other by thick walls. Two sizes of acanthostyles may be present. Zooecial walls thin in endozone, rapidly thickening in the exozone.
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
Remarks. Dyscritella Girty, 1911, generally lacks diaphragms, which are commonly developed in the similar genus Dyscritellina Morozova in Dunaeva and Morozova, 1967. Occurrence. Devonian to Triassic; worldwide.
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
Type species. Dyscritella robusta Girty, 1911, by original designation. Mississippian; Arkansas, USA.
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

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CLASSIFICATION

Taxonomic Classification Tree

AnimaliaBryozoaStenolaemataTrepostomatidaDyscritellidaeDyscritella

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Source Information

Stenolaemate bryozoans from the Graham Formation, Pennsylvanian (Virgilian) at Lost Creek Lake, Texas, USA

checklist

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.

CC0Published 5/31/2022View dataset
GBIF Usage Key
226325004
Dataset Key
77c06bea-bbd5-46af-8ef1-f434aa25c6a8
Origin
source
Backbone Key
4856519
Taxon ID
03C387F19A1639722EAF07CEF07F4A50.taxon
Last Crawled
6/9/2026
Last Interpreted
6/9/2026
View on GBIFSource Reference