Nannotax3 - ntax_mesozoic - Eiffellithus striatus Nannotax3 - ntax_mesozoic - Eiffellithus striatus

Eiffellithus striatus


Classification: ntax_mesozoic -> Eiffellithales -> Eiffellithaceae -> Eiffellithus -> Eiffellithus striatus
Sister taxa: E. eximius, E. lindiensis ⟩⟨ E. gorkae, E. keio, E. parallelus, E. pospichalii, E. turriseiffelii ⟩⟨ E. collis, E. equibiramus, E. parvus ⟩⟨ E. monechiae, E. praestigium, E. vonsalisiae, E. hancockii, E. paragogus ⟩⟨ E. primus, E. striatus, E. windii, E. sp.

Distinguishing features:
Parent taxon (Eiffellithus): Loxolith coccoliths with a prominent inner rim cycle that is birefringent and conspicuous in cross-polarised light; this cycle is broader than the outer rim cycle. The central area is spanned by variably-orientated cross-bars.
This taxon: Medium to large species of Eiffellithus (>6.4µm length) with a wide central-area spanned by diagonal cross-bars.


Taxonomy:

Citation: Eiffellithus striatus (Black, 1971) Applegate & Bergen, 1988
taxonomic rank: Species
Basionym: Chiastozygus striatus Black, 1971
Synonyms:

Farinacci & Howe catalog pages: C. striatus * , C. tripes *

Distinguishing features:
Parent taxon (Eiffellithus): Loxolith coccoliths with a prominent inner rim cycle that is birefringent and conspicuous in cross-polarised light; this cycle is broader than the outer rim cycle. The central area is spanned by variably-orientated cross-bars.
This taxon: Medium to large species of Eiffellithus (>6.4µm length) with a wide central-area spanned by diagonal cross-bars.


Morphology:

There appears to continuous variation between the two end-member holotype morphologies of E. striatus and the older (ancestral) E. windii. An arbitrary morphometric cut-off point of 6.4µm coccolith length was suggested by Applegate and Bergen (1989, p.315). Both first and last occurrence of this geographically wide-ranging species are potentially valuable global bioevents.

Most likely ancestor: Eiffellithus windii - at confidence level 2 (out of 5). Data source: Applegate & Bergen 1988.

Search data:
LITHS: murolith, elliptical, CA: ca_disjunct, plate, process, diagonal cross, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Lith size: 6.4->10µm;
Data source notes: min size follows Applegate & Bergen (1988); max size from illustrated specimens
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 BC9 zone (100% up, 129.1Ma, in Hauterivian stage). Data source: Bown et al. 1998 - zonal marker. LAS is shown as earlier in the Tethyan realm - ca 0.8 up in CC4
First occurrence (base): at base of CC4 zone (0% up, 133Ma, in Valanginian stage). Data source: Bown et al. 1998, fig. 5.3

Plot of occurrence data:

References:

Applegate, J. L. & Bergen, J. A. (1988). Cretaceous calcareous nannofossil biostratigraphy of sediments recovered from the Galicia Margin, ODP Leg 103. Proceedings of the Ocean Drilling Program, Scientific Results. 103: 293-348. gs O

Black, M. (1971a). Coccoliths of the Speeton Clay and Sutterby Marl. Proceedings of the Yorkshire Geological Society. 38: 381-424. gs

Bown, P. R. & Concheyro, A. (2004). Lower Cretaceous calcareous nannoplankton from the Neuquen Basin, Argentina. In, Villa, G., Lees, J. A. & Bown, P. R. (eds) Calcareous Nannofossil Palaeoecology and Palaeocenographic Reconstructions, Proceedings of the INA9 conference, Parma 2002. Marine Micropaleontology . 52(1-4): 51-84. gs

Bown, P. R. (2005c). Early to Mid-Cretaceous Calcareous Nannoplankton from the Northwest Pacific Ocean, Leg 198, Shatsky Rise. Proceedings of the Ocean Drilling Program, Scientific Results. 198: 1-82. gs O

Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Lower Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 86-131. gs O

Bralower, T. J., Monechi, S. & Thierstein, H. R. (1989). Calcareous nannofossil zonation of the Jurassic-Cretaceous boundary interval and correlation with the geomagnetic polarity timescale. Marine Micropaleontology. 14: 153-235. gs

Jeremiah, J. (1996). A proposed Albian to Lower Cenomanian nannofossil biozonation for England and the North Sea Basin. Journal of Micropalaeontology. 15(97-129): -. gs

Köthe, A. (1981). Kalkiges Nannoplankton aus dem Unter-Hauterivum bis Unter-Barremium der Tongrube Moorberg/ Sarstedt (Unter-Kreide, NW-Deutschland). Mitteilungen der geologischen Institut Universitat Hannover. 21: 1-95. gs

Mutterlose, J. (1988). Das kalkige Nannoplankton des NW-Deutschen Valangin und seine paaozeanographische Deutung. (Calcareous nannoplankton of the NW-German Valanginian and their paleoceanographic meaning.). Berliner Geowissenschaftliche Abhandlungen. 175-209. gs

Mutterlose, J. (1992). Lower Cretaceous nannofossil biostratigraphy off northwestern Australia (Leg 123). Proceedings of the Ocean Drilling Program, Scientific Results. 123: 343-368. gs

Taylor, R. J. (1978). The distribution of calcareous nannofossils in the Speeton Clay (Lower Cretaceous) of Yorkshire. Proceedings of the Yorkshire Geological Society. 42: 195-209. gs

Varol, O. & Girgis, M. (1994). New taxa and taxonomy of some Jurassic to Cretaceous calcareous nannofossils. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 192: 221-253. gs


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Eiffellithus striatus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-4-2024

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10420 Go to Archive.is to create a permanent copy of this page - citation notes
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