radiolaria - rads_cenozoic - Stylosphaeridae

radiolaria - rads_cenozoic - Stylosphaeridae radiolaria - rads_cenozoic - Stylosphaeridae

Stylosphaeridae

Classification: rads_cenozoic -> Actinommidae -> Stylosphaeridae
Sister taxa: Actinommidae (ss), Actinommidae inc sed, Astrosphaeridae, Centrocubidae, Hexalonchidae, Hexastylidae, Quinquecapsulariidae, Rhizosphaeridae, Saturnalidae, Spongosphaeridae, Stylosphaeridae

Daughter taxa (time control age-window is: 0-800Ma)		Granddaughter taxa
	Amphisphaera neptune records: 344	Amphisphaera aotea Amphisphaera cristata Amphisphaera cronos Amphisphaera kina Amphisphaera megapora Amphisphaera spinosa Amphisphaera spinulosa Amphisphaera sp.
	Amphistylus neptune records: 1316	Amphistylus angelinus Amphistylus sp.
	Cromyatractus neptune records:	Cromyatractus elegans Cromyatractus sp.
	Cromydruppocarpus neptune records:	Cromydruppocarpus esterae Cromydruppocarpus sp.
	Druppatractus neptune records: 354	Druppatractus hastatus Druppatractus irregularis Druppatractus nanus Druppatractus pyriformis Druppatractus variabilis Druppatractus sp.
	Ellipsostylus neptune records:	Ellipsostylus distachyus Ellipsostylus salebrosus
	Ellipsoxiphium neptune records:	Ellipsoxiphium palliatum Ellipsoxiphium sp.
	Ellipsoxiphus neptune records: 1	Ellipsoxiphus sp.
	Entapium neptune records: 9	Entapium chaenapium Entapium regulare Entapium sp.
	Lithatractus neptune records: 99	Lithatractus timmsi Lithatractus sp.
	Protoxiphotractus neptune records: 1	Protoxiphotractus wilsoni Protoxiphotractus sp.
	Sphaerostylus neptune records: 44	Sphaerostylus cristatus Sphaerostylus hastatus Sphaerostylus nicholasi Sphaerostylus rosetta Sphaerostylus sp.
	Spongatractus neptune records: 438	Spongatractus balbis Spongatractus pachystylus Spongatractus sp.
	Stauroxiphos neptune records: 116	Stauroxiphos communis Stauroxiphos sp.
	Stylacontarium neptune records: 1166	Stylacontarium acquilonium Stylacontarium bispiculum Stylacontarium sp.
	Stylatractus neptune records: 2154	Stylatractus coronatus Stylatractus fragilis Stylatractus giganteus Stylatractus neptunus Stylatractus ostracion Stylatractus pluto Stylatractus santaeannae Stylatractus transparum Stylatractus universus Stylatractus sp.
	Stylosphaera neptune records: 332	Stylosphaera coronata Stylosphaera dixyphos Stylosphaera hexaxyphophora Stylosphaera hispida Stylosphaera laevis Stylosphaera macrosphaera Stylosphaera minor Stylosphaera radiosa Stylosphaera sp.
	Xiphatractus neptune records:	Xiphatractus brevispina Xiphatractus spumeus Xiphatractus sp.
	Xiphosphaera neptune records: 1	Xiphosphaera gaea Xiphosphaera tesseractis Xiphosphaera sp.

Taxonomy

Taxonomic rank: family (new classif)

Taxonomic discussion: This family is part of the revised classification system being developed by Prof. Suzuki and colleagues

Catalog entries: Stylosphaeridae [no catalog entry yet]

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Description

Published descriptions

Dumitrica, in De Wever et al. 2001 -

Type genus: Stylosphaera Ehrenberg, 1847
Definition: Actinommacea with two prominent polar spines (that may be absent in older species), surrounded or not by a cluster of shorter polar spines. Polar spines, usually three-bladed, originating from a usually ovoid (rarely spherical to ellipsoidal) latticed medullary shell, connected to the cortical shell(s) by numerous, radial bars, which do not become external. Cortical shell simple or multiple, usually with large and irregularly subdivided pores. Additional radial secondary spines may be some- times present on the external shell.

Remarks: The Stylosphaeridae are externally similar to the Axopruninae in having two prominent polar spines, but they differ by the actinommid structure of their medullary shell, and usually in having three-bladed polar spines.

Range: Late Cretaceous (Cenomanian) to Recent

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant. Data source: Total of ranges of the species in this database
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian 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. Parent: Actinommidae

References:

Stylosphaeridae compiled by the radiolaria@mikrotax project team viewed: 6-10-2026

Taxon Search:

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Short stable page link: https://mikrotax.org/radiolaria/index.php?id=206150 Go to Archive.is to create a permanent copy of this page - citation notes

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