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IRMNG name detailsPalaeopontosphaera D. Noël, 1965 †
1101245 (urn:lsid:irmng.org:taxname:1101245)
unaccepted (synonym)
Genus
marine,
fossil only
Sue les coccolithes du Jurassique europeen et d'Afrique du Nord. Essai de classification des coccolithes fossiles. Centre National de la Recherche Scientifique, Paris
page(s): 76 [details]
Taxonomic remark From Nannotax3: In a study of the oldest (Early Jurassic) biscutaceans, de Kaenel & Bergen (1993) proposed considerable...
Taxonomic remark From Nannotax3: In a study of the oldest (Early Jurassic) biscutaceans, de Kaenel & Bergen (1993) proposed considerable revision to this family, distinguishing Palaeopontosphaera (arguably a junior synonym of Biscutum) from Biscutum by the presence of a birefringent, distal inner-cycle. The type species holotype (EM) of Biscutum is a proximal view and thus the presence or absence of a tube cycle cannot be determined. Moreover, they argue that the aforementioned holotype is very nearly circular and emend the genus in such a way as to render it equivalent to Bidiscus Bukry, 1969 (?=Discorhabdus Noël, 1965) (i.e., circular to subcircular, unicyclic placoliths). The interpretation of these problematic holotype images is questionable. Here we follow Bown & Young (1997) and Bown (1998) retain the traditional usage of Biscutum, i.e. subcircular to elliptical biscutacean coccoliths which typically have a distal, inner tube cycle. [details]
IRMNG (2021). Palaeopontosphaera D. Noël, 1965 †. Accessed at: https://www.irmng.org/aphia.php?p=taxdetails&id=1101245 on 2025-03-19
Date action by 2016-11-22 08:30:58Z changed db_admin
original description
Sue les coccolithes du Jurassique europeen et d'Afrique du Nord. Essai de classification des coccolithes fossiles. Centre National de la Recherche Scientifique, Paris
page(s): 76 [details] basis of record Farr, E. R.; Zijlstra, G. (eds). (1996-current). Index Nominum Genericorum (ING). A compilation of generic names published for organisms covered by the ICN: International Code of Nomenclature for Algae, Fungi, and Plants. [previously: organisms covered by the International Code for Botanical Nomenclature] (2007 version). , available online at https://naturalhistory2.si.edu/botany/ing/ [details] basis of record Neave, S. A. and successors. (1939-2004). Nomenclator Zoologicus, vols. 1-10 online. [developed by uBio, hosted online at MBLWHOI Library]. Previously at http://ubio.org/NomenclatorZoologicus/ (URL no longer current). , available online at https://insecta.bio.spbu.ru/z/nomenclator_zoologicus_PDF.htm [details] basis of record SN2000 unverified [details] additional source Young, J. R.; Bown, P. R.; Lees, J. A. (eds). Nannotax3 website. International Nannoplankton Association (2020 version). Available online at http://www.mikrotax.org/Nannotax3/. [details] source of synonymy Young, J. R.; Bown, P. R. (1997). Cenozoic calcareous nannoplankton classification. <em>Journal of Nannoplankton Research.</em> 19(1): 36-47. [details] name verified source Farr, E. R.; Zijlstra, G. (eds). (1996-current). Index Nominum Genericorum (ING). A compilation of generic names published for organisms covered by the ICN: International Code of Nomenclature for Algae, Fungi, and Plants. [previously: organisms covered by the International Code for Botanical Nomenclature] (2007 version). , available online at https://naturalhistory2.si.edu/botany/ing/ [details] extant flag source SN2000 unverified [details] habitat flag source as per family [details] Unreviewed
Descriptive info Lower Jurassic (Toarcian); France (Vassy, Yonne). (Index Nominum Genericorum) [details]Taxonomic remark From Nannotax3: In a study of the oldest (Early Jurassic) biscutaceans, de Kaenel & Bergen (1993) proposed considerable revision to this family, distinguishing Palaeopontosphaera (arguably a junior synonym of Biscutum) from Biscutum by the presence of a birefringent, distal inner-cycle. The type species holotype (EM) of Biscutum is a proximal view and thus the presence or absence of a tube cycle cannot be determined. Moreover, they argue that the aforementioned holotype is very nearly circular and emend the genus in such a way as to render it equivalent to Bidiscus Bukry, 1969 (?=Discorhabdus Noël, 1965) (i.e., circular to subcircular, unicyclic placoliths). The interpretation of these problematic holotype images is questionable. Here we follow Bown & Young (1997) and Bown (1998) retain the traditional usage of Biscutum, i.e. subcircular to elliptical biscutacean coccoliths which typically have a distal, inner tube cycle. [details] |
