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IRMNG taxon detailsCalcitarcha †
101 (urn:lsid:irmng.org:taxname:101)
G.J.M. Versteegh, T. Servais, M. Streng, A. Munnecke & D. Vachard, 2009
accepted
Phylum
marine,
fossil only
Versteegh, G. J. M.; Servais, T.; Streng, M.; Munnecke, A.; Vachard, D. (2009). A discussion and proposal concerning the use of the term Calcispheres. <em>Palaeontology.</em> 52(2): 343-348., available online at https://doi.org/10.1111/j.1475-4983.2009.00854.x [details]
Taxonomic remark The formal fossil "Group" Calcitarcha was created by Versteegh et al., 2009 for hollow calcareous-walled microfossils of...
Taxonomic remark The formal fossil "Group" Calcitarcha was created by Versteegh et al., 2009 for hollow calcareous-walled microfossils of unknown affinity, known informally as calcispheres, analogous to the terms acritarchs/Acritarcha used for organic-walled microfossils of unknown affinity (Evitt, 1963). Versteegh et al., 2009 recommended that "the Calcitarcha be treated under the International Code of Botanical Nomenclature"; the group is presently assigned in IRMNG to Biota incertae sedis. Pithonella and related genera (family Pithonellidae) are alternatively treated as calcareous dinoflagellates in some systems. The oldest generic name employed for calcispheres, Calcisphaera Williamson, 1880, is presently listed under Charophyceae since its type species, C. robusta, has been identified as a charophyte oogonium, although other species historically assigned to that genus belong in Calcitarcha (and possibly elsewhere). [details]
IRMNG (2025). Calcitarcha †. Accessed at: https://www.irmng.org/aphia.php?p=taxdetails&id=101 on 2026-03-23
Date action by
original description
Versteegh, G. J. M.; Servais, T.; Streng, M.; Munnecke, A.; Vachard, D. (2009). A discussion and proposal concerning the use of the term Calcispheres. <em>Palaeontology.</em> 52(2): 343-348., available online at https://doi.org/10.1111/j.1475-4983.2009.00854.x [details]
basis of record Versteegh, G. J. M.; Servais, T.; Streng, M.; Munnecke, A.; Vachard, D. (2009). A discussion and proposal concerning the use of the term Calcispheres. <em>Palaeontology.</em> 52(2): 343-348., available online at https://doi.org/10.1111/j.1475-4983.2009.00854.x [details] additional source Wendler, J. E.; Wendler, I.; Huber, B. T. (2013). Revision and evaluation of the systematic affinity of the calcitarch genus Pithonella based on exquisitely preserved Turonian material from Tanzania. <em>Journal of Paleontology.</em> 87(06): 1077-1106., available online at https://doi.org/10.1666/12-121 note: affinities of Pithonella, refer note [details] taxonomy source Versteegh, G. J. M.; Servais, T.; Streng, M.; Munnecke, A.; Vachard, D. (2009). A discussion and proposal concerning the use of the term Calcispheres. <em>Palaeontology.</em> 52(2): 343-348., available online at https://doi.org/10.1111/j.1475-4983.2009.00854.x note: refer note [details] current name source Versteegh, G. J. M.; Servais, T.; Streng, M.; Munnecke, A.; Vachard, D. (2009). A discussion and proposal concerning the use of the term Calcispheres. <em>Palaeontology.</em> 52(2): 343-348., available online at https://doi.org/10.1111/j.1475-4983.2009.00854.x [details] extant flag source Versteegh, G. J. M.; Servais, T.; Streng, M.; Munnecke, A.; Vachard, D. (2009). A discussion and proposal concerning the use of the term Calcispheres. <em>Palaeontology.</em> 52(2): 343-348., available online at https://doi.org/10.1111/j.1475-4983.2009.00854.x [details] habitat flag source Versteegh, G. J. M.; Servais, T.; Streng, M.; Munnecke, A.; Vachard, D. (2009). A discussion and proposal concerning the use of the term Calcispheres. <em>Palaeontology.</em> 52(2): 343-348., available online at https://doi.org/10.1111/j.1475-4983.2009.00854.x [details] Unreviewed
Taxonomic remark The formal fossil "Group" Calcitarcha was created by Versteegh et al., 2009 for hollow calcareous-walled microfossils of unknown affinity, known informally as calcispheres, analogous to the terms acritarchs/Acritarcha used for organic-walled microfossils of unknown affinity (Evitt, 1963). Versteegh et al., 2009 recommended that "the Calcitarcha be treated under the International Code of Botanical Nomenclature"; the group is presently assigned in IRMNG to Biota incertae sedis. Pithonella and related genera (family Pithonellidae) are alternatively treated as calcareous dinoflagellates in some systems. The oldest generic name employed for calcispheres, Calcisphaera Williamson, 1880, is presently listed under Charophyceae since its type species, C. robusta, has been identified as a charophyte oogonium, although other species historically assigned to that genus belong in Calcitarcha (and possibly elsewhere). [details]
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