Papposphaeraceae


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

Short diagnosis: Narrow-rimmed muroliths, mostly with prominent central structures.


Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
Coccolith distal rim with separated elements
Coccosphere dimorphic - spines only on some coccoliths, calyx of four rods

Coccolith distal rim weakly serrated - elements imbricate rods;
Coccosphere dimorphic - BCs with irregular tiles & calicate coccoliths with conical calices

Coccoliths distal rim smooth; with axial cross and spine;
Coccosphere dimorphic, some coccoliths with very long spines

Coccolith distal rim serrated - elements pentagonal;
Coccosphere polymorphic, processes on only some coccoliths. Calices with 2-fold symmetry
BCs without axial spine or node

Coccolith distal rim serrated - elements pentagonal;
Coccosphere monomorphic, varimorphic, or dimorphic, calices with 4-fold (or, rarely, 3-fold) symmetry

Coccoliths distal rim smooth, with curved quadrate process;
Coccospheres trimorphic

Coccoliths with tall, narrow, quadrate spines; high rim with smooth distal rim.

Monomorphic - body coccoliths are simple hoop-like coccoliths.

Coccolith distal rim serrated - elements pentagonal;
?monomorphic, no process

Coccoliths hoop-shaped with axial cros; BCs with low windmill-like calyx; CFCs with large bladed process

Coccoliths narrow-rimmed muroliths; equatorial coccoliths with quadrate central process supported by transverse bar.
Coccosphere dimorphic, equatorial coccoliths distinctive, BCs simple muroliths

Coccoliths hoop-shaped with rods rising from rim to form wigwam-like structure

Taxonomy:

Citation: Papposphaeraceae Jordan & Young, 1990 emend Andruleit & Young 2010
Rank: Family
Synonyms: The group is sometimes informally refered to as "lightly-calcified coccolithophores". 
Notes & discussion: The Papposphaeraceae as originally described only included the genera Papposphaera and Pappomonas. Subsequently Andruleit & Young (2010) extended the family to include the narrow-rimmed muroliths group of Young et al. (2003)- ie the genera Kataspinifera, Picarola, Vexilarius and Wigwamma.
Additonal genera have since been described by Thomsen and co-workers - Formonsella, Porsilidia, and Ventimolina as well as the heterococcolith stage of Quaternariella
NB Some online databases suggest that the Papposphaeraceae should be considered a junior synoym of the Deflandriaceae (= Prediscosphaeraceae). As discussed by Jordan & Young (1990), this is an outdated suggestion made by Norris (1983) based on superficial similarities between Papposphaera and the Cretaceous genus Prediscosphaera.

Farinacci & Howe catalog pages: Papposphaeraceae [no catalog entry yet]

Short diagnosis: Narrow-rimmed muroliths, mostly with prominent central structures.


Morphology remarks: As noted by Andruleit & Young (2010) five morphological features characterise this group
  1. The coccoliths have simple narrow murolith rims, i.e. they have a narrow sub-vertical outer wall without flanges. In Pappomonas and Papposphaera the rim has a serrated upper margin whilst it is smooth in the other genera.
  2. Rim structure. Typically the majority of the rim is formed of a single cycle of directly abutting elements with sub-vertical sutures. In addition a second cycle of elements occurs proximally, with one of these interposed elements between each of the larger elements.
  3. Central area structure. Most species show either an axial cross or an axial cross plus additional elements.
  4. Spine structure. The different genera have distinctly different central processes. In each case though these are hollow structures with quadrate cross-section.
  5. Size. All these genera are characterized by production of small coccospheres (c. 5 µm excluding spines) and minute coccoliths (coccolith length typically 1–2 µm)

Evolution & Phylogeny: No molecular genetic data is available for this group. However, the fact that they form both typical holococcoliths and typical heterococcoliths in alternate life-cycle stages, strongly suggests they fall within the clade of holococcolith producing coccolithophores (Young et al. 2005, Andruleit & Young 2010).

Ecology & Biogeography: These occur predominantly in the Arctic and Antarctic and in the deep photic zone at lower latitudes. Chloroplasts have not been observed in these taxa and they have well-developed haptonemata, so they are thought to be heterotrophic (Thomsen & Ostergaard 2015).

Biology & life-cycles: Several species of Papposphaera and Pappomonas are known to have holococcolith stages from obsevations of combination coccospheres (e.g Thomsen et al. 1991). No species have been cultured succesfully.

Search data:
TagsLITHS: murolith, RIM: outer wall non-imbricate, rim-narrow, rim-top crenulate, DETAILS: ca_disjunct,
MetricsLith size: 0.5->2┬Ám;
Sources:
The morphological data given here can be used on the advanced search page. See also these notes

See also: Papposphaera HOL ;Trigonaspis ;Quaternariella HOL ;Balaniger HOL ;

Geological Range:
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): within Thanetian Stage (55.96-59.24Ma, base in Thanetian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Andruleit, H. & Young, J.R., (2010). Kataspinifera baumannii: a new genus and species of deep photic coccolithophores resembling the non-calcifying haptophyte Chrysochromulina. Journal of Micropalaeontology, 29: 135-147.

Dunkley Jones, T.; Bown, P.R. & Pearson, P., (2009). Exceptionally well preserved upper Eocene to lower Oligocene calcareous nannofossils (Prymnesiophycidae) from the Pande Formation (Kilwa Group), Tanzania. Journal of Systematic Palaeontology, 7(4): 359-411.

Jordan, R.W. & Young, J.R., (1990). Proposed changes to the classification system of living Coccolithophorids. International Nannoplankton Association Newsletter, 12(1): 15-18.

Norris, R.E., (1983). The family position of Papposphaera Tangen and Pappomonas Manton & Oates (Prymnesiophyceae) with records from the Indian Ocean. Phycologia, 22(2): 161-169.

Thomsen, H.A. & Ostergaard, J.B., (2015). Coccolithophorids in Polar Waters: Trigonaspis spp. revisited. Acta Protozoologica, 54: 85-96.

Thomsen, H.A.; Ostergaard, J.B. & Hansen, L.E., (1991). Heteromorphic life histories in Arctic coccolithophorids (Prymnesiophyceae). Journal of Phycology, 27: 634-642.

Young, J.R.; Geisen, M. & Probert, I., (2005). A review of selected aspects of coccolithophore biology with implications for palaeobiodiversity estimation. Micropaleontology, 51(4): 267-288.


nannotaxlogo400px

Papposphaeraceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-11-2017

Taxon Search:
Advanced Search

Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet. Be the first!

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics