Schizoporella tetragona ( REUSS , 1847)

ZÁGORŠEK, KAMIL, 2010, BRYOZOA FROM THE LANGHIAN (MIOCENE) OF THE CZECH REPUBLIC PART II: SYSTEMATIC DESCRIPTION OF THE SUBORDER ASCOPHORA LEVINSEN, 1909 AND PALEOECOLOGICAL RECONSTRUCTION OF THE STUDIED PALEOENVIRONMENT, Acta Musei Nationalis Pragae Series B 66 (3 - 4), pp. 139-255 : 139-255

Schizoporella tetragona ( REUSS, 1847)

Pl. 103, Fig. 1-6

v. * 1847 Cellepora tetragona m. – Reuss p. 78, Pl. 9, Fig. 19 1989 Schizoporella tetragona ( REUSS, 1847) – Schmid p. 43,

Pl. 12, Fig. 8 (cum syn.)

T y p e: The holotype was identified by David and Pouyet (1974 called ‘hololectotype’); it is deposited in the Natural History Museum Vienna under the number 1867.40.35 .

M a t e r i a l: Very abundant, occurs in almost all the studied sections. More than 100 specimens were studied in detail.

D i a g n o s i s: Colony encrusting, sometimes forming a multilayer overgrowth upon each other. Autozooecia tetragonal to square-shaped or oval with polygonal pores on the frontal wall. No umbo on the frontal wall. Aperture on a short peristome usually situated on one of the distal corners of the autozooecium; aperture with a wide sinus. Primary orifice circular. Avicularia suboral, usually situated on the autozooecial frontal wall, in the corner opposite to the aperture, small with a pivotal bar. Ovicell unknown.

Re m a r k s: The shape of the autozooecia may vary within the colony from distinctly tetragonal to oval. The characteristic features are the asymmetrically placed aperture with its wide sinus, the absence of any umbo and the small suboral avicularium.