New robertinid foraminifers from the Early Jurassic of Adnet, Austria and their evolutionary importance
New benthic multichambered foraminifers have been discovered in the Hettangian–Sinemurian of the Northern Calcareous Alps (Adnet, Salzburg, Austria). Originally aragonitic, these forms are completely recrystallized but the early impregnation of their tests by Fe-Mn solutions has, to some extent, all...
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| Format: | Article |
| Language: | English |
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Institute of Paleobiology PAS
2016-12-01
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| Series: | Acta Palaeontologica Polonica |
| Subjects: | |
| Online Access: | http://www.app.pan.pl/archive/published/app61/app002502016.pdf |
| _version_ | 1828778681701498880 |
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| author | Sylvain Rigaud Joachim Blau |
| author_facet | Sylvain Rigaud Joachim Blau |
| author_sort | Sylvain Rigaud |
| collection | DOAJ |
| description | New benthic multichambered foraminifers have been discovered in the Hettangian–Sinemurian of the Northern Calcareous Alps (Adnet, Salzburg, Austria). Originally aragonitic, these forms are completely recrystallized but the early impregnation of their tests by Fe-Mn solutions has, to some extent, allowed an indirect preservation of their primary structure. The most remarkably preserved specimens are found in close vicinity to the marmorea crust, a heavily mineralized multiphased hardground. We describe two new genera, Velleditsiella gen. nov., a microgastropod look-alike foraminifer, which includes the species V. felicitaszae gen. et sp. nov. and V. spinaferra gen. et sp. nov., and Rossanella gen. nov., the first known representative of the superfamily Conorboidoidea, which includes the species R. martinii gen. et sp. nov. Considering their structural and morphological characteristics, Velleditsiella and Rossanella phylogenetically derive from two distinct Triassic lineages, respectively the families Trochosiphoniidae and Variostomatidae. The discovery of diverse aragonitic assemblages in earliest Jurassic strata dismisses the long believed hypothesis that all Jurassic aragonitic multichambered foraminifers originated from a single Oberhauserellidae ancestor. It also supports a lower impact of the Triassic/Jurassic biotic crisis on the evolution of aragonitic foraminifers. Hypotheses for the short term and long term evolution of aragonitic multichambered foraminifers are discussed and new phyletic trees are proposed. |
| first_indexed | 2024-12-11T16:47:12Z |
| format | Article |
| id | doaj.art-3aba353978fe47d2a9b355295de5a885 |
| institution | Directory Open Access Journal |
| issn | 0567-7920 1732-2421 |
| language | English |
| last_indexed | 2024-12-11T16:47:12Z |
| publishDate | 2016-12-01 |
| publisher | Institute of Paleobiology PAS |
| record_format | Article |
| series | Acta Palaeontologica Polonica |
| spelling | doaj.art-3aba353978fe47d2a9b355295de5a8852022-12-22T00:58:10ZengInstitute of Paleobiology PASActa Palaeontologica Polonica0567-79201732-24212016-12-0161472173410.4202/app.00250.2016New robertinid foraminifers from the Early Jurassic of Adnet, Austria and their evolutionary importanceSylvain Rigaud0Joachim Blau1Earth Observatory of Singapore, 50 Nanyang Avenue, 639798 Singapore, SingaporeGeozentrum, FE Geologie, Altenhöferallee 1, 60438 Frankfurt am Main, GermanyNew benthic multichambered foraminifers have been discovered in the Hettangian–Sinemurian of the Northern Calcareous Alps (Adnet, Salzburg, Austria). Originally aragonitic, these forms are completely recrystallized but the early impregnation of their tests by Fe-Mn solutions has, to some extent, allowed an indirect preservation of their primary structure. The most remarkably preserved specimens are found in close vicinity to the marmorea crust, a heavily mineralized multiphased hardground. We describe two new genera, Velleditsiella gen. nov., a microgastropod look-alike foraminifer, which includes the species V. felicitaszae gen. et sp. nov. and V. spinaferra gen. et sp. nov., and Rossanella gen. nov., the first known representative of the superfamily Conorboidoidea, which includes the species R. martinii gen. et sp. nov. Considering their structural and morphological characteristics, Velleditsiella and Rossanella phylogenetically derive from two distinct Triassic lineages, respectively the families Trochosiphoniidae and Variostomatidae. The discovery of diverse aragonitic assemblages in earliest Jurassic strata dismisses the long believed hypothesis that all Jurassic aragonitic multichambered foraminifers originated from a single Oberhauserellidae ancestor. It also supports a lower impact of the Triassic/Jurassic biotic crisis on the evolution of aragonitic foraminifers. Hypotheses for the short term and long term evolution of aragonitic multichambered foraminifers are discussed and new phyletic trees are proposed.http://www.app.pan.pl/archive/published/app61/app002502016.pdfRobertinidaTrochosiphoniidaeConorboididaeinner-chamber structuresmarmorea crustJurassicAustria |
| spellingShingle | Sylvain Rigaud Joachim Blau New robertinid foraminifers from the Early Jurassic of Adnet, Austria and their evolutionary importance Acta Palaeontologica Polonica Robertinida Trochosiphoniidae Conorboididae inner-chamber structures marmorea crust Jurassic Austria |
| title | New robertinid foraminifers from the Early Jurassic of Adnet, Austria and their evolutionary importance |
| title_full | New robertinid foraminifers from the Early Jurassic of Adnet, Austria and their evolutionary importance |
| title_fullStr | New robertinid foraminifers from the Early Jurassic of Adnet, Austria and their evolutionary importance |
| title_full_unstemmed | New robertinid foraminifers from the Early Jurassic of Adnet, Austria and their evolutionary importance |
| title_short | New robertinid foraminifers from the Early Jurassic of Adnet, Austria and their evolutionary importance |
| title_sort | new robertinid foraminifers from the early jurassic of adnet austria and their evolutionary importance |
| topic | Robertinida Trochosiphoniidae Conorboididae inner-chamber structures marmorea crust Jurassic Austria |
| url | http://www.app.pan.pl/archive/published/app61/app002502016.pdf |
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