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): at top of Turonian Stage (100% up, 89.8Ma, in Turonian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Aalenian Stage (0% up, 174.2Ma, 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. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 34-85. gs

Perch-Nielsen, K. (1985b). Mesozoic calcareous nannofossils. In, Bolli, H. M. , Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 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: 18-9-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11259 Go to Archive.is to create a permanent copy of this page - citation notes



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