Roniewicz, 1968:306

Type Species

Actinaraeopsis araneola Roniewicz 1968:306: pl. 1, fig. 1a,b; Original Designation 1968:306

Type Specimen: Holotype; ZPAL H.III/666; Not Traced; Unknown

Type Locality: Bałtów, North East Holy Cross Mts, Poland. Gregoryceras transversarium zone, Middle Oxfordian, Late Jurassic



Thamnasterioid – sub-cerioid with calices bordered by peripheral elevation of endoheca; radial elements subcompact, perforated, confluent, anastomosing: inner margin with trabecular projections, distal margin moniliform, septal faces with pointed granules; columella monotrabecular, synapticulae present; endothecal elements tabuloid; increase by intracalicular budding. Microstructure: trabeculae simple with lateral embranchments which form pointed granulae on the septal faces, and synapticulae


The type species described based on thin sections and illustrated in Roniewicz 1968: 306 and 1976: 90, pl. 24, fig. 1a-d. Aragonite skeleton microstructure of A. exilis Roniewicz, 1968 described and illustrated with thin sections and SEM photos in Roniewicz 1984: 171, pls.62-65,pl.66,figs. 1a,b, 4. Cretaceous species, A. ventosiana Morycowa and Masse, described and internal structure in transverse and longitudinal sections well illustrated by Morycowa and Masse 2007:142, Fig. 3A-G.


Actinaraeopsis is similar to Actinaraea d’Orbigny in structural septal porosity and tabuloid endotheca. The genera differ from each other in the colony type: thamnasterioid-subcerioid in Actinaraepsis while thamnasterioid - plocoid in the latter, and subcompact radial elements in Actinaraeopsis while regularly porous in Actinaraea.


Three or four species.


  • Western Europe; Late Jurassic
  • Central Europe; Late Jurassic
  • North Africa; Late Jurassic
  • Western Europe; Early Cretaceous
Middle Oxfordian - Early Kimmeridgian, Poland, Romania. Upper Barremian, France. Late Jurassic, Algeria.

This page has been in preparation since 07-May-2009 07:17

This version was contributed by Ewa Roniewicz on 19-Nov-2010 17:50.

Page authors are: Ewa Roniewicz. Please contact the editor if you would like to contribute to the diagnosis of this taxon.

The editor is: Bernard Lathuilière

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