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IRMNG taxon detailsDiscoasterales †
marine,
fossil only
Not documented
Taxonomic remark A fossil-only order; 1 extant species (D. planktonicus) had been assigned to this otherwise fossil genus, but is in fact a...
Taxonomic remark A fossil-only order; 1 extant species (D. planktonicus) had been assigned to this otherwise fossil genus, but is in fact a dinoflagellate cyst bearing discoaster-like ornamentation, Scrippsiella regalis (was Rhabdothorax gerenus), refer Doweld, 2014. From Nannotax 3: Hay (1977) described the Order Discoasterales as a broad taxonomic group that included most radial and stellate Mesozoic and Cenozoic nannoliths. It is used here as a narrower taxonomic concept that incorporates the type family, the Discoasteraceae, together with the other radially symmetrical Paleogene nannolith groups, the Heliolithaceae, Fasciculithaceae and Sphenolithaceae, which originated within four million years of one another and have common morphological features suggesting phylogenetic affinity (Bown 2010). ... The earliest members of the Discoasterales appear in the Palaeocene and they show more similarities to heterococcoliths -see e.g. Aubry et al. 2011. They also share with radial symmetry and precise control of calcite crystallographic orientation and complex sculpting of individual calcite crystal units. They apparently lack however growth from a proto-coccolith ring and so presence of alternating V- and R-units. Phylogenetically it seems reasonable to infer that they evolved from heterococcoliths by modification of the biomineralisation process. [details]
IRMNG (2022). Discoasterales †. Accessed at: https://www.irmng.org/aphia.php?p=taxdetails&id=11273 on 2024-04-24
Date action by
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]
taxonomy source Doweld, A. B. (2014). (2265–2267) Proposals to conserve the name <I>Discoaster</I> against <I>Eu-discoaster</I>, <I>Helio-discoaster</I> and <I>Hemi-discoaster</I>, and the names <I>Heliodiscoaster</I> and <I>Hemidiscoaster</I> with those spellings (fossil <I>Prymnesiophyta</I> (<I>Algae</I>) vel <I>Haptomonada</I> (<I>Protista</I>)). <em>Taxon.</em> 63(1): 195-197., available online at https://doi.org/10.12705/631.26 [details] name verified source Doweld, A. B. (2014). (2265–2267) Proposals to conserve the name <I>Discoaster</I> against <I>Eu-discoaster</I>, <I>Helio-discoaster</I> and <I>Hemi-discoaster</I>, and the names <I>Heliodiscoaster</I> and <I>Hemidiscoaster</I> with those spellings (fossil <I>Prymnesiophyta</I> (<I>Algae</I>) vel <I>Haptomonada</I> (<I>Protista</I>)). <em>Taxon.</em> 63(1): 195-197., available online at https://doi.org/10.12705/631.26 [details] current name source Doweld, A. B. (2014). (2265–2267) Proposals to conserve the name <I>Discoaster</I> against <I>Eu-discoaster</I>, <I>Helio-discoaster</I> and <I>Hemi-discoaster</I>, and the names <I>Heliodiscoaster</I> and <I>Hemidiscoaster</I> with those spellings (fossil <I>Prymnesiophyta</I> (<I>Algae</I>) vel <I>Haptomonada</I> (<I>Protista</I>)). <em>Taxon.</em> 63(1): 195-197., available online at https://doi.org/10.12705/631.26 [details] extant flag source Doweld, A. B. (2014). (2265–2267) Proposals to conserve the name <I>Discoaster</I> against <I>Eu-discoaster</I>, <I>Helio-discoaster</I> and <I>Hemi-discoaster</I>, and the names <I>Heliodiscoaster</I> and <I>Hemidiscoaster</I> with those spellings (fossil <I>Prymnesiophyta</I> (<I>Algae</I>) vel <I>Haptomonada</I> (<I>Protista</I>)). <em>Taxon.</em> 63(1): 195-197., available online at https://doi.org/10.12705/631.26 [details] habitat flag source Doweld, A. B. (2014). (2265–2267) Proposals to conserve the name <I>Discoaster</I> against <I>Eu-discoaster</I>, <I>Helio-discoaster</I> and <I>Hemi-discoaster</I>, and the names <I>Heliodiscoaster</I> and <I>Hemidiscoaster</I> with those spellings (fossil <I>Prymnesiophyta</I> (<I>Algae</I>) vel <I>Haptomonada</I> (<I>Protista</I>)). <em>Taxon.</em> 63(1): 195-197., available online at https://doi.org/10.12705/631.26 [details] From other sources
Taxonomic remark A fossil-only order; 1 extant species (D. planktonicus) had been assigned to this otherwise fossil genus, but is in fact a dinoflagellate cyst bearing discoaster-like ornamentation, Scrippsiella regalis (was Rhabdothorax gerenus), refer Doweld, 2014. From Nannotax 3: Hay (1977) described the Order Discoasterales as a broad taxonomic group that included most radial and stellate Mesozoic and Cenozoic nannoliths. It is used here as a narrower taxonomic concept that incorporates the type family, the Discoasteraceae, together with the other radially symmetrical Paleogene nannolith groups, the Heliolithaceae, Fasciculithaceae and Sphenolithaceae, which originated within four million years of one another and have common morphological features suggesting phylogenetic affinity (Bown 2010). ... The earliest members of the Discoasterales appear in the Palaeocene and they show more similarities to heterococcoliths -see e.g. Aubry et al. 2011. They also share with radial symmetry and precise control of calcite crystallographic orientation and complex sculpting of individual calcite crystal units. They apparently lack however growth from a proto-coccolith ring and so presence of alternating V- and R-units. Phylogenetically it seems reasonable to infer that they evolved from heterococcoliths by modification of the biomineralisation process. [details]
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