The final, Late Campanian – Early Maastrichtian stage of Micraster and Isomicraster (Echinoidea, Spatangoida) development
The final, late Campanian – early Maastrichtian stage of development of echinoids Micraster and Isomicraster, was studied based on extensive material from the Upper Cretaceous sediments of the North Caucasus, Mangyshlak, Kopetdag, Volga and Transvolga regions. The changes in the complex of...
Saved in:
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Saratov State University
2025-06-01
|
| Series: | Известия Саратовского университета. Новая серия: Серия Науки о Земле |
| Subjects: | |
| Online Access: | https://geo.sgu.ru/sites/geo.sgu.ru/files/text-pdf/2025/06/nauki_o_zemle-2025_2-135-145.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849430555234402304 |
|---|---|
| author | Kalyakin, Evgeniy Aleksandrovich |
| author_facet | Kalyakin, Evgeniy Aleksandrovich |
| author_sort | Kalyakin, Evgeniy Aleksandrovich |
| collection | DOAJ |
| description | The final, late Campanian – early Maastrichtian stage of development of echinoids Micraster and Isomicraster, was studied based on extensive material from the Upper Cretaceous sediments of the North Caucasus, Mangyshlak, Kopetdag, Volga and Transvolga regions. The changes in the complex of morphological characters in the youngest species, which are predominantly connected with variability in the structure of the oral surface of the test, considered in detail. It is shown that similar morphological changes occurred in different representatives of these genera at approximately the same time in different territories. The stratigraphic significance of Micraster brongniarti Hebert and M. grimmensis Nietsch was assessed. Conclusions about possible paths of distribution of M. grimmensis Nietsch in the Campanian – Maastrichtian water areas of the European, Mediterranean and Central Asian palaeobiogeographical areas were drawn. In total material from three collections of 110 specimens was studied. |
| format | Article |
| id | doaj-art-4c1b11e1f36b45b781287a7e23e020dd |
| institution | Kabale University |
| issn | 1819-7663 2542-1921 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Saratov State University |
| record_format | Article |
| series | Известия Саратовского университета. Новая серия: Серия Науки о Земле |
| spelling | doaj-art-4c1b11e1f36b45b781287a7e23e020dd2025-08-20T03:27:57ZengSaratov State UniversityИзвестия Саратовского университета. Новая серия: Серия Науки о Земле1819-76632542-19212025-06-0125213514510.18500/1819-7663-2025-25-2-135-145The final, Late Campanian – Early Maastrichtian stage of Micraster and Isomicraster (Echinoidea, Spatangoida) developmentKalyakin, Evgeniy Aleksandrovich0Saratov State University, 83, Astrakhanskaya Str., Saratov, 410012, RussiaThe final, late Campanian – early Maastrichtian stage of development of echinoids Micraster and Isomicraster, was studied based on extensive material from the Upper Cretaceous sediments of the North Caucasus, Mangyshlak, Kopetdag, Volga and Transvolga regions. The changes in the complex of morphological characters in the youngest species, which are predominantly connected with variability in the structure of the oral surface of the test, considered in detail. It is shown that similar morphological changes occurred in different representatives of these genera at approximately the same time in different territories. The stratigraphic significance of Micraster brongniarti Hebert and M. grimmensis Nietsch was assessed. Conclusions about possible paths of distribution of M. grimmensis Nietsch in the Campanian – Maastrichtian water areas of the European, Mediterranean and Central Asian palaeobiogeographical areas were drawn. In total material from three collections of 110 specimens was studied.https://geo.sgu.ru/sites/geo.sgu.ru/files/text-pdf/2025/06/nauki_o_zemle-2025_2-135-145.pdfcampanianmaastrichtianechinoidsmicrasterisomicraster |
| spellingShingle | Kalyakin, Evgeniy Aleksandrovich The final, Late Campanian – Early Maastrichtian stage of Micraster and Isomicraster (Echinoidea, Spatangoida) development Известия Саратовского университета. Новая серия: Серия Науки о Земле campanian maastrichtian echinoids micraster isomicraster |
| title | The final, Late Campanian – Early Maastrichtian stage of Micraster and Isomicraster (Echinoidea, Spatangoida) development |
| title_full | The final, Late Campanian – Early Maastrichtian stage of Micraster and Isomicraster (Echinoidea, Spatangoida) development |
| title_fullStr | The final, Late Campanian – Early Maastrichtian stage of Micraster and Isomicraster (Echinoidea, Spatangoida) development |
| title_full_unstemmed | The final, Late Campanian – Early Maastrichtian stage of Micraster and Isomicraster (Echinoidea, Spatangoida) development |
| title_short | The final, Late Campanian – Early Maastrichtian stage of Micraster and Isomicraster (Echinoidea, Spatangoida) development |
| title_sort | final late campanian early maastrichtian stage of micraster and isomicraster echinoidea spatangoida development |
| topic | campanian maastrichtian echinoids micraster isomicraster |
| url | https://geo.sgu.ru/sites/geo.sgu.ru/files/text-pdf/2025/06/nauki_o_zemle-2025_2-135-145.pdf |
| work_keys_str_mv | AT kalyakinevgeniyaleksandrovich thefinallatecampanianearlymaastrichtianstageofmicrasterandisomicrasterechinoideaspatangoidadevelopment AT kalyakinevgeniyaleksandrovich finallatecampanianearlymaastrichtianstageofmicrasterandisomicrasterechinoideaspatangoidadevelopment |