Kologyra
Wells, 1937, p.74
Type Species
Pachygyra tuberosa d'Orbigny 1850, p. 38; Original Designation
Type Specimen: Syntype; MNHN R09341; Verified; Dry Preserved
Type Locality: Oxfordian (Upper Jurassic) of Châtel-Censoir (France)
Classification
Description
(from the syntype) Massive meandroid (nearly phacelo-meandroid) corallum with closed valleys separated by deep and wide ambulacra. Distinct centers. Peritheca between valleys covered with finely granulated rows. Lower face covered by a smooth tectura. Radial elements compact, free, bicuneiform, straight, highly unequal, typically rhipidogyrid in shape. Inner edge often enlarged in T, auricules present. Lateral faces covered with numerous strong granules. No palis. Hexameral symmetry not deciphered, bilateral symmetry obviously demonstrated by the elongation of calices and by the lamellar columella. Endotheca not observed. synapticulae absent. Thick wall.
Comparisons
A probable transition exists with the clearly phaceloïd genus Aplosmilia. The wide and deep peritheca allows a distinction with Psammogyra.
Remarks
Errenst 1991, p. 4 pl. 13 fig. 3a-c and Pandey and Fürsich 2003, p. 124 pl. 37 fig. 5 cited the type-species. Five nominal species are known in Jurassic.
Distribution
- Western Europe; Late Jurassic
- Southern Europe; Late Jurassic
- Central Europe; Late Jurassic
- South Asia; Late Jurassic
This page has been in preparation since 19-Aug-2009 15:06
This version was contributed by Bernard Lathuilière on 04-Mar-2011 10:24.
Page authors are: Bernard Lathuilière. 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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