Helicosphaera HOL dalmaticus type


Ancestry: Coccolithophores -> Holococcoliths -> flat-topped -> Helicosphaera HOL -> Helicosphaera HOL dalmaticus type
Sister taxa: H. HOL catilliferus type, H. HOL confusus type, H. HOL dalmaticus type, H. HOL ponticuliferus type,

Short diagnosis: Liths with open centre spanned by broad central mound from which 4-6 irregular ridges radiate defining pores.


Taxonomy:

Citation: Helicosphaera HOL dalmaticus type informal
Rank: Form
Synonyms: Syracosphaera dalmatica Kamptner 1927; Syracolithus dalmaticus (Kamptner 1927) Loeblich & Tappan 1966;
Notes & discussion: Nomenclature here follows Young & Bown (2014)

Farinacci & Howe catalog pages: Syracosphaera dalmatica *

Short diagnosis: Liths with open centre spanned by broad central mound from which 4-6 irregular ridges radiate defining pores.


Morphology remarks: Outer part of disk similar to S. catilliferus, inner part appears to be open, but spanned by the central mound with 4-6 irregular ridges radiating from this to define pores. Distinct central opening on proximal side, and it is likely that beneath the central mound a cavity extends to the proximal surface. Differantiation of this taxon from confusus is discussed at length in Kleijne 1991.

Size: Liths 2-3 µm long; disk 6-7 crystallites high

Biology & life-cycles: Possible combination coccosphere with H. wallichii HET observed by Geisen et al. 2002 and a rather more likley combination coccosphere with H. pavimentum HET observed by Triantaphyllou et al. 2016.

See also: Helicosphaera wallichii ;Helicosphaera pavimentum ;

Geological Range:
Last occurrence (top): Extant Data source: present in the plankton (Young et al. 2003)
First occurrence (base): within Quaternary Period (0.00-2.59Ma, base in Gelasian stage). Data source: [JRY rough estimate]

Plot of occurrence data:

References:

Geisen, M.; Billard, C.; Broerse, A.T.C.; Cros, L.; Probert, I. & Young, J.R., (2002). Life-cycle associations involving pairs of holococcolithophorid species: intraspecific variation or cryptic speciation? European Journal of Phycology, 37: 531-550.

Kamptner, E., (1927). Beitrag zur Kenntnis adriatischer Coccolithophoriden. Archiv für Protistenkunde, 58: 173-184.

Kleijne, A., (1991). Holococcolithophorids from the Indian Ocean, Red Sea, Mediterranean Sea and North Atlantic Ocean. Marine Micropaleontology, 17: 1-76.

Loeblich, A.R. & Tappan, H., (1966). Annotated index and bibliography of the calcareous nannoplankton. Phycologia, 5: 81-216.

Triantaphyllou, M. & others, (2016). Coccolithophore combination coccospheres from the NE Mediterranean Sea: new evidence and taxonomic revisions. Micropaleontology, 61(6): 457-472.

Young, J.R. & Bown, P.R., (2014). Some emendments to calcareous nannoplankton taxonomy. Journal of Nannoplankton Research, 33(1): 39-46.


Nannotax3 - Coccolithophores - Helicosphaera HOL dalmaticus type by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-3-2017

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Ines Galovic (Zagreb, Croatia)

This is also characteristic Paratethyan species for mid-Miocen (Badenian) of Slovenia, Croatia and Romania (our article).

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