Nannotax3 - ntax_cenozoic - Chrysotila roscoffensis

Citation: Chrysotila roscoffensis (Dangeard 1934) Andersen et al. 2015

Basionym: Syracosphaera roscoffensis Dangeard 1934

Synonyms:

Pontosphaera roscoffensis (P. Dangeard) Deflandre in Grassé, 1952
Syracolithus roscoffensis (Dangeard 1934) Magne 1954
Cricosphaera roscoffensis (Dangeard 1934) Gayral & Fresnel 1976
Cricosphaera roscoffensis var. haptonemofera Inouye & Chihara 1979.
Pleurochrysis haptonemofera (Inouye & Chihara 1979) Gayral & Fresnel
Pleurochrysis pseudoroscoffensis Gayral & Fresnel, 1983 (according to Andersen et al. 2015)
Chrysotila pseudoroscoffensis (Gayral & Fresnel, 1983) Andersen et al. 2014

Taxonomic discussion: This combination was ommitted from Andersen et al. 2014 but was proposed in Andersen et al. 2015. P. pseudoroscoffensis was separated from P. roscoffensis on the basis of absence of nodes on the distal shield. However, in culture intermediates occur so the separation was questioned by Probert in Young et al. (2003), and the two species were regarded as synonyms by Andersen et al. 2015. The image metadata indicates the original identification of the strains illustrated.

Distinguishing features:
Parent taxon (Chrysotila): Coccoliths elliptical narrow-rimmed placoliths with complex rim structure, open central area
This taxon: Two cycles of nodes on tube inner wall and often one cycle of nodes on the distal shield.

Intermediates between forms with nodes on the distal shield (typical P. roscoffensis) and without ("P. pseudoroscoffensis") occur (Probert unpubl. obs. in Young et al. 2003). Detailed description given in Gayral & Fresnel 1976.

The life-cycle was desribed in detail by Gayral & Fesnel (1983) including direct observations on meiosis and syngamy. The haloid phase is non-calcifiyng and maybe either non-motile, forming filamentous benthic colonies, or motile.

Geological Range:
Last occurrence (top): Extant. Data source: present in the plankton (Young et al. 2003)
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in "Holocene" stage). Data source: [JRY rough estimate]

References:

Andersen, R. A., Kim, J. I., Tittley, I. & Yoon, H. S. (2014). A re-investigation of Chrysotila (Prymnesiophyceae) using material collected from the type locality. Phycologia. 53(5): 463-473. gs

Andersen, R. A., Kim, J. I., Tittley, I. & Yoon, H. S. (2015a). Chrysotila dentata comb. nov., Chrysotila roscoffensis comb. nov. and Chrysocapsa wetherbeei sp. nov. Phycologia. 54(3): 321-322. gs

Dangeard, P. (1934). Sur l'épiphytisme d'une Coccolithinée, rencontrée à Roscoff. Actes de la Société Linnéenne de Bordeaux. 1934: 45-47. gs

Fresnel, J. & Billard, C. (1991). Pleurochrysis placolithoides sp. nov. (Prymnesiophiceae), a new marine coccolithophorid with remarks on the status of cricolith-bearing species. British Phycological Journal. 26: 67-80. gs

Gayral, P. & Fresnel, J. (1976). Nouvelles observations sur deux Coccolithophoracées marines: Cricosphaera roscoffensis (P. Dangeard) comb. nov. et Hymenomonas globosa (F. Magne) comb nov. Phycologia. 15(339-355): -. gs

Gayral, P. & Fresnel, J. (1983b). Description, sexualité et cycle de développment d'une nouvelle coccolithophoracée (Prymnesiophyceae): Pleurochrysis pseudoroscoffensis sp. nov. Protistologica. 19(2): 245-261. gs

Ignatenko, I. & Yatsenko-Stepanova, T. (2023). Coccolithophores in the algal flora from South Urals (Russia) with the description of a new Hymenomonas species. Phytotaxa. 609(1): -. gs

Inouye, I. & Chihara, M. (1979). Life history and taxonomy of Cricosphaera roscoffensis var. haptonemofera, var. nov. (Class Prymnesiophyceae) from the Pacific. Botanical Magazine, Tokyo. 92: 75-87. gs

Magne, F. (1954). Les Chrysophycées marines de la station biologique de Roscoff. Revue Generale de Botanique. 61: 389-415. gs

Thomsen, H. A. (2016). Baltic Sea coccolithophores – an overview of insights into their taxonomy and ecology from the last 40 years. Journal of Nannoplankton Research. 36(2): 97-119. gs O

Young, J. R., Geisen, M., Cros, L., Kleijne, A., Probert, I. & Ostergaard, J. B. (2003). A guide to extant coccolithophore taxonomy. Journal of Nannoplankton Research. S1: 1-132. gs

Chrysotila roscoffensis

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