Revised taxonomy and autecology for the brachiopod genusAmbocoeliain the Middle and Late Devonian northern Appalachian Basin (USA)
| Autor: | Mena Schemm-Gregory, James J. Zambito |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
0106 biological sciences
010506 paleontology biology Ecology Paleontology Ecological succession Structural basin biology.organism_classification 010603 evolutionary biology 01 natural sciences Devonian Umbonata Taxonomy (biology) Late Devonian extinction Eifelian Neoteny 0105 earth and related environmental sciences |
| Zdroj: | Journal of Paleontology. 87:277-288 |
| ISSN: | 1937-2337 0022-3360 |
| DOI: | 10.1666/12-051r.1 |
| Popis: | Brachiopods belonging toAmbocoeliaoccur ubiquitously in Middle and Upper Devonian strata of the northern Appalachian Basin. Originating during the Eifelian,Ambocoelia umbonatapersisted through numerous biocrises, but went extinct during the late Frasnian Kellwasser Crisis.Ambocoelia umbonatavar.gregaria, the only other form of this genus that is present within the New York Devonian succession, originated around the time of the Kellwasser Crisis and persisted locally into at least the latest Famennian. Examination of syntypic material ofA. umbonatavar.gregariahas resulted in the taxonomic revision of this form and elevation toAmbocoelia gregaria. Comparison of ontogenetic stages and environmental preferences ofA. umbonataandA. gregariasuggests that the latter exhibits a paedomorphic morphology that may have evolved fromA. umbonatathrough neoteny. Furthermore, these comparisons also give new autecological insights forAmbocoelia, suggesting thatA. umbonatawas capable of living in a diversity of environments by using a variety of life positions, whereasA. gregariawas likely more specialized. This taxonomic revision provides the necessary framework for revising the biostratigraphic range ofAmbocoeliaand, furthermore, the evolutionary history of this genus in relation to the Lower Kellwasser Event. |
| Databáze: | OpenAIRE |
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