Minylitha convallis

Classification: Coccolithophores -> Nannolith families inc sed -> Nannolith genera inc sed -> Minylitha -> Minylitha convallis
Sister taxa: M. convallis, M. cancellata, M. sp.,


Citation: Minylitha convallis Bukry 1973
Rank: Species
Notes & discussion:
The affinities of this species are unknown, but since it is formed of a single crystallographic unit it may be related to the Triquetrorhabdulaceae. The crystallographic orientation is wrong for it be related to Florisphaera.

Distinguishing features: Smooth apart from marginal ridges

Farinacci & Howe catalog pages: Minylitha convallis + * , ,

Morphology remarks: Plate-like rhomboidal nannoliths, with a raised rim on both sides. Acts as a single crystallographic unit with the optic axis nearly perpendicular to the plate.
Remarks: In plan view M. convallis shows only low birefringence and is easily overlooked. The dog-bone like side view, first described by Theodoridis (1984), is more distinctive and makes identification unambiguous. Can also give a Y-shaped cross-section - see comments below.

Size: : 4-8 microns long, usually 4-6 microns.

Search data:
TagsLITHS: nannolith-other, quadrate,
CSPH: not known, V-UNITS: all, R-UNITS: none, DETAILS: 1ou, length-slow,
MetricsLith size: 4->8µm;
Sources: lith size from OD & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: This species is often abundant but distribution is rather sporadic.
Last occurrence (top): in upper part of NN11a subzone (70% up, 7.7Ma, in Tortonian stage). Data source: Young 1998, position in zone estimated from fig 8.1, see also Raffi et al. 2006
First occurrence (base): in upper part of NN9 zone (70% up, 9.8Ma, in Tortonian stage). Data source: Young 1998, position in zone estimated from fig 8.1, see also Raffi et al. 2006

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: Minylitha convallis, synonyms included - Minylitha convallis; space-time plot :: Samples map :: Parent: Minylitha


    Bukry, D. (1973a). Coccolith stratigraphy, eastern equatorial Pacific, Leg 16, Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 16: 653-711. gs

    Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 225-265. gs


    Minylitha convallis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-7-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=875 Go to Archive.is to create a permanent copy of this page - citation notes

    Comments (1)

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    Mike Styzen (Noble Energy, US)
    in addition to the perspectives addressed above there is another common view which you can encounter, that ie a Y shape. When I'm training people to look for this species I talk about the I the Y and the pie!
    Mike Styzen (Noble Energy, US)
    Yes, but often it is more pronounced than what is illustrated in those photos.
    Jeremy Young (NHM, UK)

    by the Y view do you mean the ones in the lower images of image 6-29 (LM image with side views)?

    Page 1 of 1

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