Ceriostella
Roniewicz and Stanley, 1998, p. 246
In earlier literature described as Astrocoenia in Smith 1927, Actinastraea in Stanley 1979, and Guembelastraea in Montanaro-Gallitelli et al., 1979.
Type Species
Ceriostella variabilis Roniewicz and Stanley, 1998: 250, fig.; Original Designation
Type Specimen: Holotype; UMPC 18056; Verified; Dry Preserved
Type Locality: South Canyon, New Pass Range, Nevada, USA, Augusta Mountain Formation, Late Ladinian, Triassic.
The collection is housed at the UMPC
Classification
Diagnosis
Colony cerioid, wall septothecal, built of peripheral ends of septa, tectiform. Septal micromorphology granular; trabeculae of ca. 100 μm in diameter. Endotheca dissepimental. Budding intracalicular, asymmetrical, without septal connections between centers.
Description
Described and figured in Roniewicz and Stanley 1998. Additionally, description and figures of a related species, C. martini (Smith, 1927) in Roniewicz and Stanley, 2013.
Comparisons
In cerioid colonies, the genus differs from the most close Ampakabastraea Alloiteau, 1958 with astraeoid colonies.
Remarks
A wide variability of corallite diameters (d from 1.3 mm to 4.0 mm) at septa of uniform thickness, differentiate the Late Ladinian C. variabilis from Early Norian C. martini having corallite diameters usually from 2.0 mm to 2.5 mm (rarely 1.5mm or 3.0-3.5mm), with septa well differentiated in thickness. The third species, Early Norian C. parva (Smith) has the smallest diameters of corallites (1.2 mm-2.5 mm). The genus, primarily, ascribed to the family Margarophyllidae Cuif, lately, was shifted to the Pamiroseriidae Melnikova (Roniewicz and Stanley, 2013) due to traceable trabecular microstructure.
Distribution
- North America; Middle Triassic - Late Triassic
This page has been in preparation since 18-Apr-2009 15:06
This version was contributed by Ken Johnson on 22-Aug-2013 14:36.
Page authors are: Ewa Roniewicz. Please contact the editor if you would like to contribute to the diagnosis of this taxon.
The editor is: Ewa Roniewicz
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