Daughter taxa (time control age-window is: 0-800Ma)
Granddaughter taxa
Diantholitha Squat fasciculiths divided into sub-equal upper and lower cycles with different optical orientations. Conical openings on both sides, no fenestrae
Citation: Fasciculithaceae Hay & Mohler, 1967taxonomic rank: FamilyTaxonomic discussion: The species traditionally included in Fasciculithus have recently been subdivided into three genera - Fasciculithus, Gomphiolithus and Lithoptychius - and an additional genus, Diantholitha, described (Aubry et al. 2011). This scheme is further described in Aubry et al. (2012) and Monechi et al. (2012). Finally Monechi et al. (2013) provides data on their stratigraphic ranges. The term "fasciculith" is used here for nannoliths from any of the genera.
Distinguishing features: Parent taxon (Discoasterales): Radially symmetrical nannoliths formed from one to several separate cycles of elements that radiate from a common centre or axis. This taxon: Conical or cylindrical discoasteralids consisting of 10-30 wedge-shaped, radially-arranged elements, in one to three superposed cycles.
Original description: Diagnosis - Subcylindrical fossils composed of wedge-shaped segments hav- ing their thin edges meeting at the center; one end of the cylinder is concave, the other pointed or flat; surface may be highly ornamented; inter- ference figure in side view between crossed pol- arizers showing a dark line in the axis of the cylinder, but extinction of the sides is incomplete; an interference cross can be observed in end view.
Morphology: Typically fasciculiths have a concave end, which is assumed to be proximal, and a convex or pointed end, which is considered distal. The outer surface is often covered by depressions (fenestrae). Typically seen in diagnostic side view. Key references - Romein 1979; Perch-Nielsen 1985; Aubry et al. 2011; Aubry et al. 2012; Monechi et al. 2012; Monechi et al. 2013; Minatti et al. 2021 Size: Fasciculiths are predominantly moderate size nannliths within the size range 5-9µm and size does not vary much between species. The prime exception is F. tonii which is much bigger, 10-20 µm.
Search data:
Lith size: 0->0µm;
The morphological data given here can be used on the advanced search page. See also these notes
Geological Range: Last occurrence (top): at top of NP10 zone (100% up, 54.2Ma, in Ypresian stage). Data source: Total of ranges of the species in this database First occurrence (base): within NP4 zone (61.51-63.25Ma, base in Danian stage). Data source: Total of ranges 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
Neptune data: this is a higher taxon page so Neptune data is not plotted. For the customisable plot option go to a genus page Parent: Discoasterales
References:
Aubry, M. P., Bord, D. & Rodriguez, O. (2011). New taxa of the Order Discoasterales Hay 1977. Micropaleontology. 57(3): 269-287. gs
Aubry, M. -P., Rodriguez, O., Bord, D., Godfrey, L., Schmitz, B. & Knox, R. W. O. B. (2012). The first radation of the Fasciculiths: Morphologic adaptations of the coccolithophores to oligotrophy. Australian Journal of Earth Sciences. 105(1): 29-38. gs
Hay, W. W. & Mohler, H. P. (1967). Calcareous nannoplankton from Early Tertiary rocks at Point Labau, France and Paleocene-Early Eocene correlations. Journal of Paleontology. 41(6): 1505-1541. gs
Miniati, F., Cappelli, C. & Monechi, S. (2021). Revised taxonomy and early evolution of fasciculiths at the Danian–Selandian transition. Journal of Micropalaeontology. 40: 101-144. gsO
Monechi, S., Reale, V., Bernaola, G. & Balestra, B. (2012). Taxonomic review of early Paleocene fasciculiths. Micropaleontology. 58(4): 351-365. gs
Monechi, S., Reale, V., Bernaola, G. & Balestra, B. (2013). The Danian/Selandian boundary at Site 1262 (South Atlantic) and in the Tethyan region: Biomagnetostratigraphy, evolutionary trends in fasciculiths and environmental effects of the Latest Danian Event. Marine Micropaleontology. 98(1): 28-40. 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 (1): 427-555. gs
Romein, A. J. T. (1979). Lineages in Early Paleogene calcareous nannoplankton. Utrecht Micropaleontological Bulletin. 22: 1-231. gsO
Fasciculithaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-9-2024
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