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Bussonastraea

Beauvais, 1965, p.247

Bussonastraea is probably a junior synonym of Septastraeopsis.

Type Species

Bussonastraea tricalyx Beauvais 1965, p. 247, fig. 1-3; Original Designation

Type Specimen: Holotype; MNHN R10781; Verified; Dry Preserved

Type Locality: Dogger ? from Bir Remtsa n° 1927 (Tunisia)

The type is a dry preserved specimen partly dolomitised and sectionned with one transverse thin section. Additional informations are provided in Beauvais (1966), p.133 pl. 3 fig. 1

Description

Massive cerioid corallum with polygonal corallites. Lower surface costulate. Intracalicinal septal budding producing often three daughter corallites in a mother corallite. Radial elements compact free or anastomosed in the center generally attenuated and generally straight, confluent to non confluent. Distal edge not observed, inner edge of free septa attenuated and in zigzag in longitudinal section, lateral faces not ornamented, no pali. Microstructure with no visible trabecular axes. Hexameral symmetry present but disturbed by the mode of increase, bilateral symmetry occasionally expressed by elongation of corallite, junction of opposite septa or elongation of columella. Endotheca with very regularly spaced vesicular dissepiments at the periphery of the corallite, columella styliform to sublamellar always linked to inner edges of major septa, synapticules possibly present in the wall, septothecal wall whose the microstructure shows regular spots difficult to interpret.

Remarks

One nominal species, one specimen.

Distribution

  • North Africa; Middle Jurassic

This page has been in preparation since 07-May-2009 09:43

This version was contributed by Bernard Lathuilière on 02-Aug-2012 10:01.

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


Holotype of Bussonastraea tricalyx, type species of the genus
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Holotype of Bussonastraea tricalyx, type species of the genus
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Holotype of Bussonastraea tricalyx, type species of the genus
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Holotype of Bussonastraea tricalyx, type species of the genus
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See all illustrations