Classification: Mesozoic -> hidden -> deleted
Sister taxa: deleted, sandbox,

Daughter taxa: (blue => in age window 0-800Ma) Granddaughter taxa
Small to medium sized with a <1.5µm thick rim

Calyculus noeliae with low rim.

Calyculus noeliae with tall rim.

Keeled sphere, constructed from hour glass-shaped crystallites.

Keeled sphere, constructed from hour glass-shaped crystallites.

Large blocky Crepidolithus ; rim broad; central opening with robust transverse bar and spine-base. Unicyclic in xpl.

Additional lateral bars in central area 

central area narrow circular to subelliptical; birefringence moderate (typically yellow)

central area wide and elliptical; birefringence high (typically yellow to red)

Elliptical; central area with asymmetric crossbars

Elements with indented edges.

Cylindrical to barrel-shaped with moderately broad canal (similar to its wall thickness).

Small Perissocyclus; plate with two cycles of holes around large spine

Medium sized biscutacean with wide shields and very narrow central area spanned by a transverse-bar-like structure. Unicyclic or weakly bicyclic image in XPL with clearly visible elements.

Sub-circular Stephanolithion with central cross and short rim spines

Spherical calcisphere with wall formed of crystallites with c-axes parallel to wall but otherwise randomly oriented

Watznaueria with narrow central-area spanned by a slightly oblique transverse bar.

Small Lotharingius-like coccolith but lacking V-units and with irregularly formed shield elements

Crepidolithus with moderately broad rim; central area with axial cross

Relatively broad, angular, Truncatoscaphus with central area spanned by a longitudinal bar and 4 diagonal lateral bars, delimiting 6 holes.

Typical small to medium Zeugrhabdotus - used as default identification by many workers - a modern name would be Z. howei

Gracile, elliptical Stradnerlithus with central area spanned by a 6 bars (4 diagonal and 2 longitudinal).

Lotharingius with narrow rim and wide, vacant, central area, inner tube cycle (V-units) only partially developed

Minute (ca 1.8µm), narrowly elliptical Stradnerlithus with central area spanned by a longitudinal bar and ~12 lateral bars (delimiting 12 holes).


Farinacci & Howe catalog pages:

Geological Range:
Last occurrence (top): within (-Ma, top in "Holocene" stage). Data source:
First occurrence (base): within (-Ma, base in stage). Data source:

Plot of occurrence data:


Burnett, J. A. (1997a). 'Middle' Cretaceous morphological diversity within the genus Ceratolithina Martini, 1967. Journal of Nannoplankton Research. 19(1): 57-65. 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

Varol, O. & Bowman, A. R. (2019). Taxonomic revision of selected Late Jurassic (Tithonian) calcareous nannofossils and the application of mobile mounting. Neues Jahrbuch für Geologie und Paläontologie Abhandlungen. 291: 65-87. gs


deleted compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-1-2020

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