Meliceritella steenstrupi (Pergens & Meunier, 1886)

Die Probe wurde mir aus der Bryozoen Sammlung, die Prof. Dr Ehrhard Voigt dem Senckenberg Institut Frankfurt  nach seinem Tod überlassen hat, leihweise zur Verfügung gestellt. Das Original ist in der Bryozoen Sammlung Senckenberg unter der Nummer 60023 verfügbar. Siehe hier

Bryozoen, Maastrichtian, Senckenberg, Voigt, fossil, Marine Evertebraten III
Bild 1: Bryozoa fossil, Meliceritella steenstrupi (Pergens & Meunier, 1886)

Fundort:

 1960 at Curfs Quarry, 6 km Ost/Nordost von Maastricht (Grube Curfs, Geultal, Berg, Netherlands)

 

Chronostratigraphie:

Phanerozoic: Mesozoic: Cretaceous: Upper: Maastrichtian

 

Systematische Zuordnung: Animalia: Bryozoa: Stenolaemata: Cyclostomata: Tubuliporina: Ellidae: Melliceritella:

Bryozoen, Maastrichtian, Senckenberg, Voigt, fossil, Marine Evertebraten III
Bild 2: Bryozoa fossil, Meliceritella steenstrupi (Pergens & Meunier, 1886) 50B 2_5 1_25

Das Bild wurde mit dem Durchlichtmikroskop Zeiss Phomi III erstellt, im Auflichtmodus, mit Objektiv 2,5 fach, Optovar 1,25 und Okular 10fach. Kamera: Canon 60D mit Mikroskopadapter und Festbrennweitenobjektiv. Das Bild wurde ertsellt aus 50 Einzelbildern, gestackt mit Picolay.

Auszug aus:

 

„A BRYOZOAN FAUNA OF DANO-MONTIAN AGE FROM BORYSZEW AND SOCHACZEW IN CENTRAL POLAND“

 

von Ehrhard Voigt

 

 

 

Genus: Meliceritella Levinsen, 1925

 

Meliceritella steenstrupi (Pergens & Meunier, 1886) (Plate II, figs. 6 a-b, 7)

 

1886. Hornera Steenstrupi Pergens & Meunier; E. Pergens & A. Meunier, La faune des Bryozoaires, p. 218, PI. 13, figs. 2-5.

 

1912. Me!iceritites Steenstrupi (Pergens & Meunier); G. M. R. Levinsen, Studies ... , p. 39, PI. 3, figs. 11-13.

 

1925. Meiiceritella Steenstrupi (Pergens & Meunier); G. M. R. Levinsen, Undersogelser p. 418

 

 

Material and description.

The zooecia (4 specimens) are arranged on the frontal face in regular transverse rows of six zooecia each. The dorsal face shows an oblong hexagonal network of kenozooecia which are closed by a perforated calcareous lamella. The peristomes are distinctly triangular and thus demonstrate that they belong to the family Eleidae d'Orbigny.

 

I found the hitherto undescribed gonozooid at the dorsal face of one specimen from the Dano-Montian of the Curfs quarry near Berg, Geul valley (Netherlands); it forms an oblong, globular sac, corresponding in its form to the gonozooids of the Eleidae.

 

Filicrisina verticillata d'Orbigny, very common in the Maastrichtian and Upper Campanian, is also Meliceritella, although this is not at once clear from the somewhat inaccurate figure of d'Orbigny (1852, Pl. 769, figs. 5-10). This species as well as M. steenstrupi possesses a very typical feature of the Eleidae in the characteristic zooecia with trumpet­shaped distal expansions.

 

Levinsen was lead to include the family Eleidae in the Cheilostomata by their possession of opercula and avicularia, but this is proven wrong by the sac-like gonozooids and by the nature of the long tube-like cells perforated by pseudopores.

 

Occurrence. - Dano-Montian of Boryszew boring, Poland. Common in the Danian of Denmark and Sweden, as well as in Danian drift boulders of northern Germany and in the Dano-Montian of the Curfs quarry near Berg, Geul valley (Netherlands) and Montian of Belgium (Tuffeau de Ciply near Mons).