Stephanolithiaceae

Distinguishing features:
Parent taxon (Stephanolithiales): Murolith coccoliths with a distal/outer cycle of non-imbricating elements, i.e., in side view, the sutures are vertical or near-vertical.
This taxon: Murolith (protolith type) coccoliths with rims of non-imbricate V-units and weakly-developed, or vestigial, proximal/inner-cycles (R-units), with central-areas spanned by one to numerous bars. 

Daughter taxa (time control age-window is: 0-800Ma)					Granddaughter taxa
				Cylindralithus Circular or sub-circular with high, sculpted, wall; central-area vacant or with cross bars.	Cylindralithus biarcus Cylindralithus coronatus Cylindralithus sculptus Cylindralithus serratus Cylindralithus duplex Cylindralithus oweinae Cylindralithus flat-top Cylindralithus nieliae Cylindralithus sp.
				Darwinilithus Cylindrical nannofossil with median flange, a flaring cone on one side and a circlet of flaring spines on the other	Darwinilithus pentarhethum Darwinilithus sp.
				Rotelapillus Subcircular to circular; rim high, narrow, bicyclic; central area spanned by radial bars; Short spines protrude from the rim	Rotelapillus pleoseptatus Rotelapillus crenulatus Rotelapillus munitus Rotelapillus radians Rotelapillus hexaradiatus Rotelapillus applegatei Rotelapillus msakyae Rotelapillus sp.
				Stephanolithion Elliptical and often polygonal; rims low but broad, bicyclic; central-area spanned by one to eight bars; prominent spines protrude from the rim	Stephanolithion atmetos Stephanolithion bigotii Stephanolithion brevispinus Stephanolithion hexum Stephanolithion speciosum Stephanolithion sp.
				Stoverius Narrowly elliptical to circular; rim low, bicyclic; central area wide, spanned by cross bars.	Stoverius achylosus Stoverius acutus Stoverius coangustatus Stoverius protosignum Stoverius sp.
				Stradnerlithus Elliptical to diamond-shaped; rims low, narrow, unicyclic; central-area spanned by bars, radiating from central node or a longitudinal bar, usually spine bearing; typically small fragile and inconspicuous in LM.	Stradnerlithus helotatus Stradnerlithus primitus Stradnerlithus geometricus Stradnerlithus fractus Stradnerlithus bifurcatus Stradnerlithus langii Stradnerlithus tortuosus Stradnerlithus asymmetricus Stradnerlithus escovillensis Stradnerlithus fragilis Stradnerlithus callomonii Stradnerlithus comptus Stradnerlithus clatriatus Stradnerlithus wendleri Stradnerlithus haynesiae Stradnerlithus silvaradius Stradnerlithus sp.
				Polygonal
				Corollithion Polygonal, usually hexagonal; rim bicyclic; central area with 4-6 radial bars	Corollithion completum Corollithion exiguum Corollithion karegae Corollithion kennedyi Corollithion signum Corollithion covingtonii Corollithion madagaskarensis Corollithion perch-nielseniae Corollithion sp.
				Rhombolithion Diamond-shaped; rim unicyclic (stradnerlithids).	Rhombolithion minutum Rhombolithion scutulatus Rhombolithion rhombicum Rhombolithion octocostatum Rhombolithion horrellii Rhombolithion rotatum Rhombolithion duodecostatum Rhombolithion sp.
				Truncatoscaphus Polygonal (subhexagonal), often elongate and narrow; muroliths with central area spanned by a longitudinal bar and 6 or more lateral bars.	Truncatoscaphus hexaporus Truncatoscaphus octoporus Truncatoscaphus pauciramosus Truncatoscaphus intermedius Truncatoscaphus delftensis Truncatoscaphus macmillanii Truncatoscaphus sp.
				Complex central structure
				Paralithella Very small (<2 µm) elliptical stephanolithid; central area with bridge supporting a hollow spine and bars parallel to the long axis	Paralithella recta
				Rectocorona Elliptical murolith with non-imbricate wall and low spine supported by complex central structure	Rectocorona brachyrhabda Rectocorona sp.
				Thurmannolithion Elliptical; rim narrow; central area with axial cross, numerous lateral bars and spine	Thurmannolithion clatratum Thurmannolithion sp.

Taxonomy:

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

Distinguishing features:
Parent taxon (Stephanolithiales): Murolith coccoliths with a distal/outer cycle of non-imbricating elements, i.e., in side view, the sutures are vertical or near-vertical.
This taxon: Murolith (protolith type) coccoliths with rims of non-imbricate V-units and weakly-developed, or vestigial, proximal/inner-cycles (R-units), with central-areas spanned by one to numerous bars. 

Morphology:

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Danian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Pliensbachian Stage (21% up, 189.1Ma, in Pliensbachian stage). Data source: Total of range of species in this database

Plot of occurrence data:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• Neptune data: this is a higher taxon page so Neptune data is not plotted. For the customisable plot option go to a genus page Parent: Stephanolithiales

Stephanolithiaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-10-2022 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11144 Go to Archive.is to create a permanent copy of this page - citation notes

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