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Diploctenium

Goldfuss, 1827, p. 51

Type Species

Diploctenium cordatum Goldfuss, 1827: 51; Original Designation Goldfuss, 1827: 51

Type Specimen: Holotype; wamu-464; Verified; Dry Preserved

Type locality: Maastrichtian of the Netherlands (Maastricht).

Classification

Diagnosis

Colonial, pedunculated, flabelloid. Calicular series inclined or curved towards the base, in some cases the ends of the series meet or even pass each other. Costosepta compact, finely granulated laterally. Costae bifurcating and trifurcating. Columella lamellar, continuous. endothecal dissepiments few in number, vesicular. Wall septothecal, forming a stereozone.

Remarks

Bendukidze (1956, 1965) studied the stages of ontogeny of specimens of Diploctenium lunatum (Bruguiere). She concluded that skeletal elements and their dimensions in this species are directly dependent upon environment. Moreover, within the same specimen each stage of ontogeny closely corresponds to a different nominal species of Diploctenium. These results completely agree with investigations on ontogenetical stages of specimens of Diploctenium from the Santonian of Austria (Gosau Group) carried out by Baron-Szabo (2003). Based on the results of these investigations it can be concluded that stable specific characters are reflected in the density of septa and number of septal orders in relation to the width of the calicinal series.

Distribution

  • Southern Europe; Early Cretaceous - Late Cretaceous
  • Central Europe; Early Cretaceous - Paleocene
  • East Asia; Early Cretaceous
  • Eastern Europe; Late Cretaceous

This page has been in preparation since 02-Jun-2007 12:35

This version was contributed by Rosemarie Baron-Szabo on 14-Sep-2010 21:05.

Page authors are: Rosemarie Baron-Szabo. Please contact the editor if you would like to contribute to the diagnosis of this taxon.

The editor is: Rosemarie Baron-Szabo


Diploctenium jauberti Alloitesu, 1952, holotype
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Diploctenium cordatum (Goldfuss, 1827), holotype
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Diploctenium contortum Reuss, 1854, holotype
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