narrow rimmed placoliths


Ancestry: Coccolithophores -> Coccolith families inc sed -> narrow rimmed placoliths
Sister taxa: unidentified, Alisphaeraceae, Papposphaeraceae, Umbellosphaeraceae, narrow rimmed placoliths, Coccolith genera inc sed,

Short diagnosis: Diverse group of coccoliths with narow placolith rims and variable central strcutrues, usually showing four-fold symmetry


Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
Coccoliths elliptical narrow-rimmed placoliths with plate formed from numerous small elements in central area

Coccoliths narrow-rimmed placoliths with robust central spine; CFCs with tall, sail-like, spines

Coccoliths rhombic narrow-rimmed placoliths with four plates in central area

Coccoliths elliptical narrow-rimmed placoliths with four plates in central area

Coccoliths elliptical narrow-rimmed placoliths with quadrate tower-like central structure

Taxonomy:

Citation: narrow rimmed placoliths - informal Young et al., 2003
Rank: Family
Notes & discussion: This grouping is discussed in detail in Young & Andruleit (2006).

Farinacci & Howe catalog pages:

Short diagnosis: Diverse group of coccoliths with narow placolith rims and variable central strcutrues, usually showing four-fold symmetry


Morphology remarks: Rims in these genera appear to reformed of a single cycle of non-imbricate elements with radial sutures. Central area structures are highly variable but disjunct and usually with four-fold symmetry

Evolution & Phylogeny: Calyptrosphaera sphaeroidea falls within the Coccolithales clade in molecular genetic analyses (Fujiwara et al., 2001; Saez et al., 2004, Young et al. 2014 Cryptogamie)

Ecology & Biogeography: Deep photic

Biology & life-cycles: Calyptrosphaera sphaeroidea has both holococcolith and heterococcolith phases and has been cultured (Noël et al. 2004), the other taxa are so far only known from the heterococcolith phase and have not been cultured.

Geological Range:
Notes: Only Tetralithoides has a documented fossil record, extending back to the Early Miocene (Theodoridis, 1984; Young, 1998).
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): within Danian Stage (61.61-66.04Ma, base in Danian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Fujiwara, S.; Tsuzuki, M.; Kawachi, M.; Minaka, N. & Inouye, I., (2001). Molecular phylogeny of the haptophyta based on the rbcL gene and sequence variation in the spacer region of the RUBISCO operon. Journal of Phycology, 37: 121-129.

Noël, M.-H.; Kawachi, M. & Inouye, I., (2004). Induced dimorphic life cycle of a coccolithophorid, Calyptrosphaera sphaeroidea. Journal of Phycology, 40(1): 112-129.

Sáez, A.G.; Probert, I.; Young, J.R.; Edvardsen, B.; Wenche, E. & Medlin, L.K., (2004). A review of the phylogeny of the Haptophyta. In: Thierstein, H.R. and Young, J.R. (Editors), Coccolithophores - from molecular processes to global impact. Springer, pp. 251-270.

Theodoridis, S., (1984). Calcareous nannofossil biostratigraphy of the Miocene and revision of the helicoliths and discoasters. Utrecht Micropaleontological Bulletin, 32: 1-271.

Young, J.R. & Andruleit, H., (2006). Navilithus altivelum: a remarkable new genus and species of deep photic coccolithophores. Journal of Micropalaeontology, 25(2): 141-152.

Young, J.R.; Liu, H.; Probert, I.; Aris-Brosou, S. & de Vargas, C., (2014). Morphospecies versus phylospecies concepts for evaluating phytoplankton diversity: The Case of the Coccolithophores. Cryptogamie, Algologie, 35(4): 353-377.

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, Special Issue, 1: 1-132.

Young, J.R., (1998). Neogene. In: Bown, P.R. (Editor), Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publications Series. Chapman & Hall, London, pp. 225-265.


Nannotax3 - Coccolithophores - narrow rimmed placoliths by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-3-2017

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