Truncatoscaphus


Classification: Mesozoic -> Stephanolithiales -> Stephanolithiaceae -> Truncatoscaphus
Sister taxa: Corollithion, Cylindralithus, Darwinilithus, Paralithella, Rectocorona, Rhombolithion, Rotelapillus, Stephanolithion, Stoverius, Stradnerlithus, Thurmannolithion, Truncatoscaphus,

Distinguishing features: Polygonal (subhexagonal), often elongate and narrow; muroliths with central area spanned by a longitudinal bar and 6 or more lateral bars.


Daughter taxa: (blue => in age window 0-800Ma)
Small Truncatoscaphus with central area spanned by a longitudinal bar and 4 lateral bars, delimiting 6 holes.
Small Truncatoscaphus with central area spanned by a longitudinal bar and 6 lateral bars (delimiting 8 holes).
Truncatoscaphus with central area spanned by a longitudinal bar and 8 lateral bars (delimiting 10 holes).
Elongate, narrow Truncatoscaphus with central area spanned by a longitudinal bar and 12 lateral bars.
Minute (<3┬Ám), elongate Truncatoscaphus with central area spanned by a longitudinal bar and 12 or more lateral bars. Holotype material includes forms with asymmetric bar arrangement.
small (<4µm) Truncatoscaphus with longitudinal bar, four diagonal bars forming central cross and additional delicate lateral bars
Specimens not identified to species level

Taxonomy:

Citation: Truncatoscaphus Rood et al., 1971
Rank: Genus
Type species: Zygolithus delftensis Stradner & Adamiker, 1966
Notes & discussion: The species are not well differentiated and the genus may be over-divided, but Perch-Nielsen (1985, 1986, p. 840) argues that there is a trend of increasing number of pores with time.

Farinacci & Howe catalog pages: Truncatoscaphus *

Distinguishing features: Polygonal (subhexagonal), often elongate and narrow; muroliths with central area spanned by a longitudinal bar and 6 or more lateral bars.


Morphology remarks: Typically small, fragile coccoliths with narrow, elongate outline. Only present when preservation is good and so reported stratigraphic ranges are often discontinuous.

Geological Range:
Last occurrence (top): within Turonian Stage (89.77-93.90Ma, top in Turonian stage). Data source: Total of range of species in this database
First occurrence (base): within Aalenian Stage (170.30-174.15Ma, base in Aalenian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bown, P.R. & Cooper, M.K.E., (1998). Jurassic. In: Bown, P.R. (Editor), Calcareous nannofossil biostratigraphy. British Micropalaeontological Society Publication Series. Chapman & Hall, pp. 34-85.GS

Perch-Nielsen, K., (1985). Mesozoic calcareous nannofossils. In: Bolli, H.M., Saunders, J.B. and Perch-Nielsen, K. (Editors), Plankton Stratigraphy. Cambridge University Press, Cambridge, pp. 329-426.GS

Perch-Nielsen, K., (1986). New Mesozoic and Paleogene calcareous nannofossils. Eclogae Geologicae Helvetiae, 79(3): 835-847.GS

Rood, A.P.; Hay, W.W. & Barnard, T., (1971). Electron Microscope Studies of Oxford Clay Coccoliths. Eclogae Geologicae Helvetiae, 64: 245-272.GS


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Truncatoscaphus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-3-2019

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