Minylitha convallis

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

Distinguishing features: Smooth apart from marginal ridges


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.

Farinacci & Howe catalog pages: Minylitha convallis + *

Distinguishing features: Smooth apart from marginal ridges

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->8┬Ám;
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:


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

Young, J.R., (1998). Neogene. In: Bown, P.R. (Editor), Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publications Series. Chapman & Hall, London, pp. 225-265.


Minylitha convallis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-10-2018

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=875Go 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)?

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