Jimenezberrocosoia


Classification: Mesozoic -> Podorhabdales -> Biscutaceae -> Jimenezberrocosoia
Sister taxa: Biscutum, Boletuvelum, Chiastella, Crucibiscutum, Discorhabdus, Gaarderella, Gephyrobiscutum, Helicorhabdus, Jimenezberrocosoia, Seribiscutum, Similiscutum, Sollasites,

Short diagnosis: Elliptical with slits between shield elements and axial cross


Daughter taxa (blue => in age window 0-300Ma)
Small to very small (<3µm), central area very narrow 
Medium sized (4-6µm) with narrow central area and birefringent cross. Short-axis crossbar brighter than long-axis crossbar.

Taxonomy:

Citation: Jimenezberrocosoia Lees & Bown 2016
Rank: Genus
Type species: Jimenezberrocosoia birchiae Lees & Bown 2016
Notes & discussion: This genus has central-area features similar to certain species of Sollasites Black, 1967, but is distinct from Sollasites because of the distinctive rim slits. [Lees & Bown 2016]

Farinacci & Howe catalog pages: Jimenezberrocosoia [no catalog entry yet]

Short diagnosis: Elliptical with slits between shield elements and axial cross


Morphology remarks:

Biscutacean placolith coccoliths with slits between the elements of the distal shield. The narrow to moderately wide, open, elliptical central-areas are spanned by distinct structures, comprising an axial cross and accessory bars. The proximal shield comprises a rim of elongated, widely-spaced elements radiating from the central tube-cycle. [Lees & Bown 2016]

Geological Range:
Last occurrence (top): within Coniacian Stage (86.26-89.77Ma, top in Coniacian stage). Data source: Total of range of species in this database
First occurrence (base): within Aptian Stage (112.95-126.30Ma, base in Aptian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Lees, J.A. & Bown, P.R., (2016). New and intriguing calcareous nannofossils from the Turonian (Upper Cretaceous) of Tanzania. Journal of Nannoplankton Research, 36(1): 83-95.


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Jimenezberrocosoia compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-1-2018

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