Trochoplegmopsis
Roniewicz, 1976: 95
Type Species
Trochoplegma gregoryi Koby, 1905: 126, pl. 25, fig. 19, 19a; Monotypy Roniewicz, 1976:: 95
Type Specimen: Lectotype; ; Not Traced; Unknown
Type Locality: Vallée d’Abbadia, Castanheira, Portugal. Séquanian, Late Jurassic.
paralectotype illustrated by Koby 1905: pl. 26, fig. 21, 21a.
Classification
Diagnosis
Solitary, pedonculate, lower surface costulated. Calice concave, largely open, rimmed. Septa anasomosing, porous, pennular, distal margin denticulated, inner margin lacerated. Columella papillar. Endotheca abundant, built of extended, low, thin-walled dissepiments. Latomeandrid septal microstructure.
Description
The original description and illustrations well present the external features of the species (Koby, 1905: 126, pl. 25:19, 19a). The specimens from Romania (FGGUB no 14, 249, 250) were described and illustrated by Roniewicz (1976: 96): pl. 27, fig. 1a-c; 2, 3a, b.
Comparisons
Type specimens from Portugal described by Koby 1905 and this from Romania described by Roniewicz 1976: 95-96, pl. 27, fig. 1a-c; 2, 3a, b, are similar in the shape of calice which is largely open, deep, sharply rimmed, and septa non-exsert and irregularly perforated. In these features it differs from Trochoplegma Gregoryi, 1900, which has convex calices with exsert costosepta and typical microsolenid septal. From Epistreptophyllum Milaschewitsch, 1876 revised by Pandey and Lathuilière (1997) it differs in thin septa with exclusively pennular septal micromorphology, with thin-edged pennules symmetrically and asymmetrically distributed on the septal faces, and with thin elements of the papillar columella.
Remarks
Type species is the only documented species of the genus.
Distribution
- Western Europe; Late Jurassic
- Central Europe; Late Jurassic
This page has been in preparation since 20-Aug-2009 09:37
This version was contributed by Ewa Roniewicz on 27-Nov-2010 10:15.
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
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