Minylitha convallis


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

Short diagnosis: See generic diagnosis (monospecific)


Taxonomy:

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 + *

Short diagnosis: See generic diagnosis (monospecific)


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.

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:

References:

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.


Nannotax3 - Coccolithophores - Minylitha convallis by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-4-2017

Taxon
Search
Search term: in module
Advanced
Search




Comments (1)

Sort By
Page 1 of 1
 
Gravatar
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!
Gravatar
Mike Styzen (Noble Energy, US)
Yes, but often it is more pronounced than what is illustrated in those photos.
Gravatar
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
 

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics