Nannotax3 - ntax_mesozoic - Stephanolithiaceae

Nannotax3 - ntax_mesozoic - Stephanolithiaceae Nannotax3 - ntax_mesozoic - Stephanolithiaceae

Stephanolithiaceae

Classification: ntax_mesozoic -> Stephanolithiales -> Stephanolithiaceae
Sister taxa: Parhabdolithaceae, 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:

Citation: Stephanolithiaceae Black 1968

taxonomic rank: Family

Taxonomic discussion: The family as originally described by Black (1968) included only Stephanolithion. The concept of the family was broadened by Black (1973).

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

Morphology:

LM image is usually unicyclic and inconspicuous, although a number of genera do exhibit bicyclicity, e.g. Rotelapillus, Stephanolithion and Stoverius. Coccolith outlines may be polygonal.

Search data:

CA: murolith, ca_disjunct,

Lith size: 0->0µm;

The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Danian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NJ4b subzone (185.53-189.13Ma, base in Pliensbachian stage). Data source: Total of ranges 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

References:

Black, M. (1968). Taxonomic problems in the study of coccoliths. Palaeontology. 11: 793-813. gs

Black, M. (1973). British Lower Cretaceous Coccoliths. I-Gault Clay (Part 2). Palaeontographical Society Monograph. 127: 49-112. gs

Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 34-85. gs O

Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Lower Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 86-131. gs O

Stephanolithiaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-12-2023

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

Nannotax is being sponsored through 2024 by Woodside Energy and Shell USA

Add Comment

Comments

No comments yet. Be the first!