Frech, 1890:48

Corals of this genus were described under the following generic names: Fungia Lamarck,1801; Thecophyllia Milne Edwards et Haime,1848; Lepiconus Stoppani,1857; Oppelismilia Duncan,1867; Phacelostylophyllum Melnikova,1972.

Type Species

Stylophyllopsis polyactis Frech , 1890: 48, pl.12, fig. 3, pl. 5, fig.17-23; Subsequent Designation Diener 1921

Type Specimen: Lectotype; BSPG AS XII 53; Verified; Dry Preserved

Type Locality: Kesselwand-Rohrmoos , Gosaukamm region, Northern Calcareous Alps. Zlambach Beds, Rhaetian, Late Triassic

Lectotype was indicated by Roniewicz 1989:124.



Solitary and phaceloid. Increase intracalicular of variable pattern. Septal spines long and joined by stereome to form subcompact septal blades with large, isolated pores. The inner septal margin dissociated into septal spines. Distal edge coarsely denticulate. Wall epithecal. Columella papillar, composed of free septal spines. Endotheca formed by large, densely packed dissepiments. Microstructure homogeneous: skeleton is made of stereomal tissue composed of bundles of fibres.In the septal spines an axial rod or lamella is present. A secondary stereom layer joins the septal spines with each other and continues into the upper dissepimental layer.


First descriptions of the microstructure, with illustrations, were given by Cuif 1972(1973):239-256, fig.14-22. Cuif analysed microstructural features of Rhaetian species preserved in aragonite. Description of morphological diversity within the genus was given by Roniewicz 1989:pls.38-40.


Comparisons with related genera, Oppelismilia Duncan and Molukkia Jaworski, was made by Frech 1964. Stylophyllopsis differs from Oppelismilia in thick and uneven septal spines; from Molukkia which has a disc-like corallum, it differs in elongated coralla. Stylophyllopsis is similar to Stylophyllum in having large and uneven septal spines, but differs from it in having, generally, compact septal blades.


Nearly 20 species are known in the Rhaetian and Lower Jurassic.


  • Western Europe; Late Triassic
  • Southern Europe; Late Triassic
  • Central Europe; Late Triassic
  • Central Asia; Late Triassic
  • North America; Late Triassic
World-wide distribution in the Late Triassic and Early Jurassic (Hettangian- Sinemurian).

This page has been in preparation since 19-Apr-2009 22:52

This version was contributed by Ewa Roniewicz on 07-Nov-2010 12:02.

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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