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Plesiophyllum

Alloiteau, 1952, p. 605

Erroneously, Alloiteau (1955) proposed again Plesiophyllum as a new genus for P. harrensis, a coral of Upper Jurassic of Yemen

Type Species

Montlivaltia laxa Fromentel and Ferry 1867 p. 151 pl. 35 fig. 3; Original Designation

Type Specimen: Lectotype; MNHN M03533; Verified; Dry Preserved

Type Locality: Pliensbachian of May sur Orne (Calvados, France)

the lectotype is sectionned.

Synonyms

Description

Solitary trochoid to ceratoid, with an epitheca s.l. Calice subcircular and moderately deep. Radial elements are compact, free, straight, slightly curved or even bent septa s. s. Septa show regular variation of their thickness from the center to the periphery. Distal edge poorly ornamented by some regular wide festoons corresponding to the variations in thickness. Lateral faces show the subvertical orientation of these thickest and thinnest bands. Hexameral symmetry not very regular. Bilateral symmetry visible with curvature of septa and eccentricity . Endotheca with tabuloid thick dissepiments. Calicular fossa well marked and eccentric. Wall of unknown nature but peripheric in position (no costae).

Remarks

Small rows of granules evoked in the fig. 70 of Alloiteau (1957) were not seen and the angle of thick and thin bands with vertical is incredibly exaggerated.

Distribution

  • Western Europe; Early Jurassic
  • North Africa; Early Jurassic
A species is also cited from the Upper Jurassic of Yemen

This page has been in preparation since 19-Aug-2009 17:04

This version was contributed by Bernard Lathuilière on 14-Mar-2013 15:45.

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


Lectotype of the type species of Plesiophyllum
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Lectotype of the type species of Plesiophyllum
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Lectotype of the type species of Plesiophyllum
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Lectotype of the type species of Plesiophyllum
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See all illustrations