A re-description of Sandownia harrisi (Testudinata: Sandownidae) from the Aptian of the Isle of Wight based on computed tomography scans
Sandownidae is an enigmatic group of Cretaceous–Paleogene turtles with highly derived cranial anatomy. Although sandownid monophyly is not debated, relationships with other turtles remain unclear. Sandownids have been recovered in significantly different parts of the turtle tree: as stem-turtles, st...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
The Royal Society
2020-02-01
|
| Series: | Royal Society Open Science |
| Subjects: | |
| Online Access: | https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.191936 |
| _version_ | 1828823719106052096 |
|---|---|
| author | Serjoscha W. Evers Walter G. Joyce |
| author_facet | Serjoscha W. Evers Walter G. Joyce |
| author_sort | Serjoscha W. Evers |
| collection | DOAJ |
| description | Sandownidae is an enigmatic group of Cretaceous–Paleogene turtles with highly derived cranial anatomy. Although sandownid monophyly is not debated, relationships with other turtles remain unclear. Sandownids have been recovered in significantly different parts of the turtle tree: as stem-turtles, stem-cryptodires and stem-chelonioid sea turtles. Latest phylogenetic studies find sandownids as the sister-group of the Late Jurassic thalassochelydians and as stem-turtles. Here, we provide a detailed study of the cranial and mandibular anatomy of Sandownia harrisi from the Aptian of the Isle of Wight, based on high resolution computed tomography scanning of the holotype. Our results confirm a high number of anatomical similarities with thalassochelydians and particularly Solnhofia parsonsi, which is interpreted as an early member of the sandownid lineage. Sandownids + Solnhofia show many cranial modifications related to the secondary palate and a durophagous diet. Sandownia is additionally highly derived in features related to its arterial circulation and neuroanatomy, including the endosseous labyrinth. Our results imply rapid morphological evolution during the early history of sandownids. Sandownids likely evolved in central Europe from thalassochelydian ancestors during the Late Jurassic. The durophagous diet of sandownids possibly facilitated their survival of the Cretaceous/Paleogene mass extinction. |
| first_indexed | 2024-12-12T13:40:38Z |
| format | Article |
| id | doaj.art-d92d5b5dd33a4221812117dc8b1eb45d |
| institution | Directory Open Access Journal |
| issn | 2054-5703 |
| language | English |
| last_indexed | 2024-12-12T13:40:38Z |
| publishDate | 2020-02-01 |
| publisher | The Royal Society |
| record_format | Article |
| series | Royal Society Open Science |
| spelling | doaj.art-d92d5b5dd33a4221812117dc8b1eb45d2022-12-22T00:22:48ZengThe Royal SocietyRoyal Society Open Science2054-57032020-02-017210.1098/rsos.191936191936A re-description of Sandownia harrisi (Testudinata: Sandownidae) from the Aptian of the Isle of Wight based on computed tomography scansSerjoscha W. EversWalter G. JoyceSandownidae is an enigmatic group of Cretaceous–Paleogene turtles with highly derived cranial anatomy. Although sandownid monophyly is not debated, relationships with other turtles remain unclear. Sandownids have been recovered in significantly different parts of the turtle tree: as stem-turtles, stem-cryptodires and stem-chelonioid sea turtles. Latest phylogenetic studies find sandownids as the sister-group of the Late Jurassic thalassochelydians and as stem-turtles. Here, we provide a detailed study of the cranial and mandibular anatomy of Sandownia harrisi from the Aptian of the Isle of Wight, based on high resolution computed tomography scanning of the holotype. Our results confirm a high number of anatomical similarities with thalassochelydians and particularly Solnhofia parsonsi, which is interpreted as an early member of the sandownid lineage. Sandownids + Solnhofia show many cranial modifications related to the secondary palate and a durophagous diet. Sandownia is additionally highly derived in features related to its arterial circulation and neuroanatomy, including the endosseous labyrinth. Our results imply rapid morphological evolution during the early history of sandownids. Sandownids likely evolved in central Europe from thalassochelydian ancestors during the Late Jurassic. The durophagous diet of sandownids possibly facilitated their survival of the Cretaceous/Paleogene mass extinction.https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.191936sandownidaethalassochelydiacranial anatomylabyrinthturtlesevolution |
| spellingShingle | Serjoscha W. Evers Walter G. Joyce A re-description of Sandownia harrisi (Testudinata: Sandownidae) from the Aptian of the Isle of Wight based on computed tomography scans Royal Society Open Science sandownidae thalassochelydia cranial anatomy labyrinth turtles evolution |
| title | A re-description of Sandownia harrisi (Testudinata: Sandownidae) from the Aptian of the Isle of Wight based on computed tomography scans |
| title_full | A re-description of Sandownia harrisi (Testudinata: Sandownidae) from the Aptian of the Isle of Wight based on computed tomography scans |
| title_fullStr | A re-description of Sandownia harrisi (Testudinata: Sandownidae) from the Aptian of the Isle of Wight based on computed tomography scans |
| title_full_unstemmed | A re-description of Sandownia harrisi (Testudinata: Sandownidae) from the Aptian of the Isle of Wight based on computed tomography scans |
| title_short | A re-description of Sandownia harrisi (Testudinata: Sandownidae) from the Aptian of the Isle of Wight based on computed tomography scans |
| title_sort | re description of sandownia harrisi testudinata sandownidae from the aptian of the isle of wight based on computed tomography scans |
| topic | sandownidae thalassochelydia cranial anatomy labyrinth turtles evolution |
| url | https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.191936 |
| work_keys_str_mv | AT serjoschawevers aredescriptionofsandowniaharrisitestudinatasandownidaefromtheaptianoftheisleofwightbasedoncomputedtomographyscans AT waltergjoyce aredescriptionofsandowniaharrisitestudinatasandownidaefromtheaptianoftheisleofwightbasedoncomputedtomographyscans AT serjoschawevers redescriptionofsandowniaharrisitestudinatasandownidaefromtheaptianoftheisleofwightbasedoncomputedtomographyscans AT waltergjoyce redescriptionofsandowniaharrisitestudinatasandownidaefromtheaptianoftheisleofwightbasedoncomputedtomographyscans |