Cited by 53Paleontology and Evolutionary BiologyPaleontology and Stratigraphy of FossilsEvolution and Paleontology Studies

Tooth structure and phylogeny of the Upper Permian echinoid Miocidaris keyserlingi

Smith, A. B., Hollingworth, N. T. J.·1990·Proceedings of the Yorkshire Geological Society

Abstract

SUMMARY Miocidaris keyserlingiis found in the Upper Permian Ford Formation, Zechstein Cycle 1, of the Sunderland district. It is confined to reef core and fore-reef talus slope facies and is absent from higher energy reef-crest and reef-flat habitats. Well preserved material permits the description of stereom microstructure and tooth construction.M. keyserlingihas teeth identical in structure to those of Recent cidarids and this contrasts with tooth structure in both the Carboniferous archaeocidarids and the early Jurassic euechinoids. Hemipyramid morphology and perignathic girdle structure also demonstrate the close relationship betweenM. keyserlingiand Recent cidaroids. Euechinoids and cidaroids must have diverged prior to the Upper Permian and at least two separate lineages of echinoids passed across the Permo-Triassic boundary.

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Crossref · 10.1144/pygs.48.1.47

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  • The euechinoid skeletogenic micromere lineage and its embryonic skeletal structures are a derived euechinoid character that appeared in the euechinoid common ancestor probably not long after 250 mya.

    “The euechinoid skeletogenic micromere lineage and its embryonic skeletal structures thus may be considered a derived euechinoid character that appeared in the euechinoid common ancestor probably not long after 250 mya.”

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Authors
Smith, A. B., & Hollingworth, N. T. J.
Affiliations
  • British Museum (GB)
  • Department of Geology, Oxford Polytechnic, Gipsy Lane, Headington, Oxfordshire OX3 0PP
Venue
Proceedings of the Yorkshire Geological Society
Published
1990-05
Volume
48
Issue
1
Pages
47-60
ISSN
  • 0044-0604 (ISSN-L)
  • 2041-4811
OpenAlex
W2087735411
Cited by
53
References
42
Citations by year
2025: 3 · 2024: 1 · 2022: 1 · 2020: 4 · 2019: 2 · 2018: 1 · 2017: 3 · 2015: 4 · 2013: 2 · 2012: 2
FWCI
1.59
Type
journal article
Language
en
Open access
closed
Locations
Proceedings of the Yorkshire Geological Society (publishedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Evolutionary Biology
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
Keywords
sea urchins, tooth structure, phylogeny, Late Permian, Permian-Triassic boundary, reef facies

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