MORPHOMETRIC APPROACH TO DETERMINATION OF LOWER JURASSIC SIPHOVALVULINID FORAMINIFERA
Siphovalvulina is among the first foraminifera that appear on carbonate platforms of the Lower Jurassic, forming a conspicuous element of low-diversity assemblages prior to recovery after the end-Triassic biotic crisis. The high morphologic variability of species of this genus is usually not documen...
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| Format: | Article |
| Language: | English |
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Milano University Press
2018-04-01
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| Series: | Rivista Italiana di Paleontologia e Stratigrafia |
| Subjects: | |
| Online Access: | https://riviste.unimi.it/index.php/RIPS/article/view/9984 |
| _version_ | 1797761353288515584 |
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| author | LUKA GALE FILIPPO BARATTOLO ROBERTO RETTORI |
| author_facet | LUKA GALE FILIPPO BARATTOLO ROBERTO RETTORI |
| author_sort | LUKA GALE |
| collection | DOAJ |
| description | Siphovalvulina is among the first foraminifera that appear on carbonate platforms of the Lower Jurassic, forming a conspicuous element of low-diversity assemblages prior to recovery after the end-Triassic biotic crisis. The high morphologic variability of species of this genus is usually not documented, which makes the determination of species difficult and subjective. We demonstrate the variability in five morphotypes of Siphovalvulina in Sinemurian and Pliensbachian carbonate rocks from the Dinarides and the Southern Apennines. Due to the different interpretation of its architecture, an emendation of the genus Siphovalvulina is proposed. One morphotype has been left in open nomenclature and could belong to either S. variabilis Septfontaine or to S. beydouni BouDagher-Fadel & Noujaim Clark. Three morphotypes, differing in apical angle and/or size belong to S. ex gr. gibraltarensis BouDagher-Fadel, Rose, Bosence & Lord. We also describe a new genus and species, Radoicicina ciarapicae gen. n., n. sp. from the lower Sinemurian of the Southern Apennines. We suggest a close phylogenetic relationship between the two genera and introduce a new family, Siphovalvulinidae fam. n. of the superfamily Eggerelloidea. |
| first_indexed | 2024-03-12T19:11:46Z |
| format | Article |
| id | doaj.art-135ffbe4c4464b3eb57c7d5f5da54abf |
| institution | Directory Open Access Journal |
| issn | 0035-6883 2039-4942 |
| language | English |
| last_indexed | 2024-03-12T19:11:46Z |
| publishDate | 2018-04-01 |
| publisher | Milano University Press |
| record_format | Article |
| series | Rivista Italiana di Paleontologia e Stratigrafia |
| spelling | doaj.art-135ffbe4c4464b3eb57c7d5f5da54abf2023-08-02T05:45:34ZengMilano University PressRivista Italiana di Paleontologia e Stratigrafia0035-68832039-49422018-04-01124210.13130/2039-4942/99848566MORPHOMETRIC APPROACH TO DETERMINATION OF LOWER JURASSIC SIPHOVALVULINID FORAMINIFERALUKA GALEFILIPPO BARATTOLOROBERTO RETTORISiphovalvulina is among the first foraminifera that appear on carbonate platforms of the Lower Jurassic, forming a conspicuous element of low-diversity assemblages prior to recovery after the end-Triassic biotic crisis. The high morphologic variability of species of this genus is usually not documented, which makes the determination of species difficult and subjective. We demonstrate the variability in five morphotypes of Siphovalvulina in Sinemurian and Pliensbachian carbonate rocks from the Dinarides and the Southern Apennines. Due to the different interpretation of its architecture, an emendation of the genus Siphovalvulina is proposed. One morphotype has been left in open nomenclature and could belong to either S. variabilis Septfontaine or to S. beydouni BouDagher-Fadel & Noujaim Clark. Three morphotypes, differing in apical angle and/or size belong to S. ex gr. gibraltarensis BouDagher-Fadel, Rose, Bosence & Lord. We also describe a new genus and species, Radoicicina ciarapicae gen. n., n. sp. from the lower Sinemurian of the Southern Apennines. We suggest a close phylogenetic relationship between the two genera and introduce a new family, Siphovalvulinidae fam. n. of the superfamily Eggerelloidea.https://riviste.unimi.it/index.php/RIPS/article/view/9984Lower JurassicDinaridesApenninescarbonate platformSiphovalvulinaRadoicicina ciarapicaeSiphovalvulinidaemorphotype |
| spellingShingle | LUKA GALE FILIPPO BARATTOLO ROBERTO RETTORI MORPHOMETRIC APPROACH TO DETERMINATION OF LOWER JURASSIC SIPHOVALVULINID FORAMINIFERA Rivista Italiana di Paleontologia e Stratigrafia Lower Jurassic Dinarides Apennines carbonate platform Siphovalvulina Radoicicina ciarapicae Siphovalvulinidae morphotype |
| title | MORPHOMETRIC APPROACH TO DETERMINATION OF LOWER JURASSIC SIPHOVALVULINID FORAMINIFERA |
| title_full | MORPHOMETRIC APPROACH TO DETERMINATION OF LOWER JURASSIC SIPHOVALVULINID FORAMINIFERA |
| title_fullStr | MORPHOMETRIC APPROACH TO DETERMINATION OF LOWER JURASSIC SIPHOVALVULINID FORAMINIFERA |
| title_full_unstemmed | MORPHOMETRIC APPROACH TO DETERMINATION OF LOWER JURASSIC SIPHOVALVULINID FORAMINIFERA |
| title_short | MORPHOMETRIC APPROACH TO DETERMINATION OF LOWER JURASSIC SIPHOVALVULINID FORAMINIFERA |
| title_sort | morphometric approach to determination of lower jurassic siphovalvulinid foraminifera |
| topic | Lower Jurassic Dinarides Apennines carbonate platform Siphovalvulina Radoicicina ciarapicae Siphovalvulinidae morphotype |
| url | https://riviste.unimi.it/index.php/RIPS/article/view/9984 |
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