Pruvostastraea
Alloiteau, 1957 p. 282
Pruvostastraea has been attributed to the family of Amphiastraeidae by Alloiteau (1957) and to the subordinate sub-family Pruvostastraeinae by Beauvais (1981). Subsequently Eliášová (1973) attributed Pruvostastraea to the sub-family Rhipidogyrinae (or family Rhipidogyridae Koby, 1905). This family assignment was then followed by Rosendahl 1985 and Turnsek.
Type Species
Pruvostastraea labyrinthiformis Alloiteau 1957, p. 281, fig. 195-197 ; pl. 13 fig. 11; pl. 17 fig. 1; Original Designation
Type Specimen: Holotype; MNHN F.A29592; Verified; Dry Preserved
Type Locality: Tithonian (Late Jurassic) from Poisat (Ain; France)
The type species has been mentioned, illustrated and compared in Eliasova 1973.
Classification
Synonyms
Description
Massive meandroid colony made of tortuous series. The intracalicinal increase produces calicular centers not always distinct, but always in a single row within the valley. Collines made of walls that end abruptly, turning and becoming septa that reach the centers of the valleys. Radial elements are compact, straight to strongly curved, free, but occasionally bifurcating, bicuneiform or with a uniform thickness, unequal (two size orders). Lateral faces covered of small abundant closely arranged granules. Inner edge claviform (auriculae) with a rather constant distance kept between the inner edge and the lamellar columella. Microstructure with a midseptal line and secondary trabecular axes diverging from the midseptal plan to produce lateral granules (4-5/mm). Endotheca made of vesicular dissepiments, columella lamellar and thin when present. Synapticulae absent. Septothecal wall.
Comparisons
The way in which the wall turns to a septum has no equivalent in other genera.
Remarks
The genus is monospecific and known only in the Upper Jurassic (and possibly Berriasian) of Europe.
Distribution
- Western Europe, Southern Europe, Central Europe, Eastern Europe; Late Jurassic - Early Cretaceous
This page has been in preparation since 19-Aug-2009 17:20
This version was contributed by Bernard Lathuilière on 28-May-2016 10:07.
Page authors are: Bernard Lathuilière 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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