Lithostromation simplex Hexagonal, perforate nannolith with low birefringence. Six thin rays extend a short distance beyond the margin of hexagonal disc with numerous pores. Secondary shorter rays are present between each of the longer rays, which terminate at the disc edge.
Trochoaster Klump 1953 (type = T. simplex, here included as L. simplex)
Polycladolithus Deflandre in Deflandre & Fert 1954 (type = P. operosus, here included as L. operosum)
Trochastrites Stradner 1961 (type = T. deflandrei here regarded as j. syn of L. simplex)
Imperiaster Martini 1970 (type species: Discoaster obscurus = L. obscurum)
Distinguishing features: Parent taxon (Lithostromationaceae): Large (10-20µm) triangular to stellate nannoliths with porous structure formed from small crystallites. In xpl behave as single crystal unit with low birefringence This taxon: Triangular to stellate nannoliths with porous structure formed from small crystallites.
The morphological data given here can be used on the advanced search page. See also these notes
Geological Range: Last occurrence (top): in mid part of Ionian Stage (52% up, 0.4Ma, in Ionian stage). Data source: Total of range of species in this database First occurrence (base): at base of Ypresian Stage (0% up, 56Ma, in Thanetian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Deflandre, G. & Fert, C. (1954). Observations sur les coccolithophoridés actuels et fossiles en microscopie ordinaire et électronique. Annales de Paléontologie. 40: 115-176. gs
Deflandre, G. (1942b). Possibilitès morphogénétiques comparées du calcaire et de la silice, à propos d'un nouveau type de microfossile calcaire de structure complexe, Lithostromation perdurum n. g. n. sp. Comptes Rendus Hebdomadaires des Séances de l'Académie des Sciences, Paris. 214: 917-920. gs
Deflandre, G. (1959). Sur les nannofossiles calcaires et leur systématique. Revue de Micropaléontologie. 2: 127-152. gs
Klumpp, B. (1953). Beitrag zur Kenntnis der Mikrofossilien des Mittleren und Oberen Eozän. Palaeontographica Abteilung A Palaeozoologie Stratigraphie. 103: 377-406. gs
Martini, E. (1970). Imperiaster n. g. aus dem europäischen Unter-Eozän (Nannoplankton, incertae sedis). Senckenbergiana Lethaea. 51: 383-386. gs
Perch-Nielsen, K. (1985). Cenozoic calcareous nannofossils. In, Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 427-555. gs
Lithostromation compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 1-6-2023
In the article "The fossil record of coastal coccolithophores" - 2019, you posted a photo of Lithostromation stellaris. But I did not find a description of this species. I also met similar specimens in the Eocene, I could not identify them. It looks like Lithostromation simplex or Trochoaster martinii, but they are certainly not. Do you have a description of this species and its stratigraphic distribution. Why is this species not in Nanotax3 ?
Jeremy Young
(London, UK)
Hi Vladimir
Polycladolithus stellaris was described by Stradner 1959 and reillustrated by Stradner et al 2010, it is generally regarded as a junior synonym of L. simplex. I am not sure if the combination Lithostromation stellaris has been formally proposed - Paul Bown wrote the relevant part of the paper on shallow marine nannos. I will ask him.
Comments
(1)
Hello Jeremy.
In the article "The fossil record of coastal coccolithophores" - 2019, you posted a photo of Lithostromation stellaris. But I did not find a description of this species. I also met similar specimens in the Eocene, I could not identify them. It looks like Lithostromation simplex or Trochoaster martinii, but they are certainly not. Do you have a description of this species and its stratigraphic distribution. Why is this species not in Nanotax3 ?
Hi Vladimir
Polycladolithus stellaris was described by Stradner 1959 and reillustrated by Stradner et al 2010, it is generally regarded as a junior synonym of L. simplex. I am not sure if the combination Lithostromation stellaris has been formally proposed - Paul Bown wrote the relevant part of the paper on shallow marine nannos. I will ask him.
Jeremy