Muscle scars in euomphaline gastropods from the Ordovician of Baltica
A discrete pair of muscle scars is described for the first time on the umbilical wall of the open-coiled, hyperstrophic ophiletoidean gastropod Asgardispira, a close relative of the widely distributed Lytospira, from the middle Ordovician of the eastern Baltica. In a unique specimen of the euomphalo...
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| Format: | Article |
| Language: | English |
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Estonian Academy Publishers
2019-05-01
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| Series: | Estonian Journal of Earth Sciences |
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| Online Access: | http://www.kirj.ee/public/Estonian_Journal_of_Earth_Sciences/2019/issue_2/earth-2019-2-88-100.pdf |
| _version_ | 1818878118511771648 |
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| author | John S. Peel |
| author_facet | John S. Peel |
| author_sort | John S. Peel |
| collection | DOAJ |
| description | A discrete pair of muscle scars is described for the first time on the umbilical wall of the open-coiled, hyperstrophic ophiletoidean gastropod Asgardispira, a close relative of the widely distributed Lytospira, from the middle Ordovician of the eastern Baltica. In a unique specimen of the euomphaloidean Lesueurilla of similar age and derivation, the muscles have coalesced into a single scar. A pair of pedal retractor muscles is characteristic of several major groups of gastropods both in the Lower Palaeozoic and at the present day, and was likely an ancestral character of the class. The consolidation of muscle attachment to a single site may reflect the tightening of the logarithmic spiral of the shell and is probably related to the increasing development of anisostrophic coiling and shell re-orientation during gastropod evolution. |
| first_indexed | 2024-12-19T14:09:06Z |
| format | Article |
| id | doaj.art-1b8a124113b049818d50d879d3c4de20 |
| institution | Directory Open Access Journal |
| issn | 1736-4728 1736-7557 |
| language | English |
| last_indexed | 2024-12-19T14:09:06Z |
| publishDate | 2019-05-01 |
| publisher | Estonian Academy Publishers |
| record_format | Article |
| series | Estonian Journal of Earth Sciences |
| spelling | doaj.art-1b8a124113b049818d50d879d3c4de202022-12-21T20:18:12ZengEstonian Academy PublishersEstonian Journal of Earth Sciences1736-47281736-75572019-05-016828810010.3176/earth.2019.0810.3176/earth.2019.08Muscle scars in euomphaline gastropods from the Ordovician of BalticaJohn S. Peel0Department of Earth Sciences (Palaeobiology), Uppsala University, Villavägen 16, SE 75236 Uppsala, Sweden; john.peel@pal.uu.seA discrete pair of muscle scars is described for the first time on the umbilical wall of the open-coiled, hyperstrophic ophiletoidean gastropod Asgardispira, a close relative of the widely distributed Lytospira, from the middle Ordovician of the eastern Baltica. In a unique specimen of the euomphaloidean Lesueurilla of similar age and derivation, the muscles have coalesced into a single scar. A pair of pedal retractor muscles is characteristic of several major groups of gastropods both in the Lower Palaeozoic and at the present day, and was likely an ancestral character of the class. The consolidation of muscle attachment to a single site may reflect the tightening of the logarithmic spiral of the shell and is probably related to the increasing development of anisostrophic coiling and shell re-orientation during gastropod evolution.http://www.kirj.ee/public/Estonian_Journal_of_Earth_Sciences/2019/issue_2/earth-2019-2-88-100.pdfgastropodsmuscle scarsOrdovicianBaltica. |
| spellingShingle | John S. Peel Muscle scars in euomphaline gastropods from the Ordovician of Baltica Estonian Journal of Earth Sciences gastropods muscle scars Ordovician Baltica. |
| title | Muscle scars in euomphaline gastropods from the Ordovician of Baltica |
| title_full | Muscle scars in euomphaline gastropods from the Ordovician of Baltica |
| title_fullStr | Muscle scars in euomphaline gastropods from the Ordovician of Baltica |
| title_full_unstemmed | Muscle scars in euomphaline gastropods from the Ordovician of Baltica |
| title_short | Muscle scars in euomphaline gastropods from the Ordovician of Baltica |
| title_sort | muscle scars in euomphaline gastropods from the ordovician of baltica |
| topic | gastropods muscle scars Ordovician Baltica. |
| url | http://www.kirj.ee/public/Estonian_Journal_of_Earth_Sciences/2019/issue_2/earth-2019-2-88-100.pdf |
| work_keys_str_mv | AT johnspeel musclescarsineuomphalinegastropodsfromtheordovicianofbaltica |