Assipetra terebrodentarius


Classification: Mesozoic -> Nannoliths inc sedis -> Nannoliths inc sed - radiate multielement -> Assipetra -> Assipetra terebrodentarius
Sister taxa: A. infracretacea, A. terebrodentarius, A. sp.,

Distinguishing features: Blocky, globular nannoliths formed from six or more complexly intergrown calcite blocks that are joined along broadly radial sutures; roughly circular in plan view and rectangular in side view.


Taxonomy:

Citation: Assipetra terebrodentarius (Applegate et al. in Covington & Wise, 1987) Rutledge & Bergen in Bergen, 1994
Rank: Species
Basionym: Rucinolithus terebrodentarius Applegate et al. in Covington & Wise, 1987
Variants: Differentiated by Tremolada & Erba (2002) into:
Synonyms: Assipetra infracretacea larsonii Tremolada & Erba (2002) [cf. Bown 2005 these are side views of A. terebrodentarius]

Farinacci & Howe catalog pages: Rucinolithus terebrodentarius * , Assipetra terebrodentarius youngii * , Assipetra infracretacea larsonii * , Rucinolithus terebrodentarius youngii * ,

Distinguishing features: Blocky, globular nannoliths formed from six or more complexly intergrown calcite blocks that are joined along broadly radial sutures; roughly circular in plan view and rectangular in side view.


Morphology remarks: The FO is usually considered to be late Hauterivian (Bergen, 1994; Channell et al., 1995) but slightly earlier at Shatsky Rise, where its range overlaps with Cruciellipsis cuvillieri, in sediments assigned to upper Subzone NC4b. This range overlap has also been reported by Erba et al. (1999) and Lozar and Tremolada (2003). The upper range is uncertain but specimens have been observed as high as the Campanian (Lees and Bown, 2005; Lozar and Tremolada, 2003).

Geological Range:
Last occurrence (top): within Campanian Stage (72.05-83.64Ma, top in Campanian stage). Data source: Lees and Bown, 2005
First occurrence (base): near top of NC5 zone (90% up, 127Ma, in Hauterivian stage). Data source: Bown et al. 1998, fig. 5.2

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Assipetra terebrodentarius, synonyms included - Assipetra terebrodentarius; Rucinolithus terebrodentarius; Assipetra terebrodentarius youngii; Assipetra terebrodentarius terebrodentarius; space-time plot :: Samples map :: Parent: Assipetra

    References:

    Bergen, J. A. (1994). Berriasian to early Aptian calcareous nannofossils from the Vocontian Trough (SE France) and Deep Sea Drilling Site 534: new nannofossil taxa and a summary of low-latitude biostratigraphic events. Journal of Nannoplankton Research. 16: 59-69. 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

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

    Covington, J. M. & Wise, S. W. (1987). Calcareous nannofossil biostratigraphy of a Lower Cretaceous deep-sea fan complex: Deep Sea Drilling Project Leg 93 Site 603, lower continental rise off Cape Hatteras. Initial Reports of the Deep Sea Drilling Project. 93: 617-660. gs

    Erba, E. et al. (1999). Integrated stratigraphy of the Cismon APTICORE (southern Alps, Italy): a “reference section” for the Barremian–Aptian interval at low latitudes. Journal of Foraminiferal Research. 29: 371-391. gs

    Lees, J. A. & Bown, P. R. (2005). Upper Cretaceous calcareous nannofossil biostratigraphy, ODP Leg 198 (Shatsky Rise, Northwest Pacific Ocean). Proceedings of the Ocean Drilling Program. Scientific Results. 198: 1-60. gs

    Lozar, F. & Tremolada, F. (2003). Calcareous nannofossil biostratigraphy of Cretaceous sediments recovered at ODP Site 1149 (Leg 185, Nadezhda Basin, Western Pacific). In: Proceedings of the Ocean Drilling Program, Scientific Results Volume 185. Ludden, J.N., Plank, T. and Escutia, C. (Editors), Ocean Drilling Program, College Station. 185: 21. Proceedings of the Ocean Drilling Program. Scientific Results. 185: 1-21. gs

    Tremolada, F. & Erba, E. (2002). Morphometric analyses of Aptian Assipetra infracretacea and Rucinolithus terebrodentarius nannoliths: implications for taxonomy, biostratigraphy and paleoceanography. Marine Micropaleontology. 44: 77-92. gs

    Missing or ambiguous references: Channell et al. 1995;


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    Assipetra terebrodentarius compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-7-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10046 Go to Archive.is to create a permanent copy of this page - citation notes



    Comments (1)

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    Fabio Lamm (Rio de Janeiro, Brazil)

    I´m looking for the reference Applegate et al. (2007) cited in:

    Assipetra terebrodentarius terebrodentarius Applegate et al. (2007) - small, <8µm

    I just found the paper from 1987: Covington, J.M. & Wise, S.W., (1987). Calcareous nannofossil biostratigraphy of a Lower Cretaceous deep-sea fan complex: Deep Sea Drilling Project Leg 93 Site 603, lower continental rise off Cape Hatteras. Initial Reports of the Deep Sea Drilling Project, 93: 617-660.

    Could you please send me the complete reference of Applegate et al. (2007)?

    Best regards.

    Gravatar
    Jeremy Young (Tonbridge, UK)

    Fabio

    Sorry about that there was a typo there and the reference should have been to Applegate et al. in Covington & Wise 1987, There is no Applegate metal 2007 publication -or at least not one which is relevant.

    Jeremy

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