Schizostomella grinzingensis ( DAVID et POUYET, 1974)

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

Schizostomella grinzingensis ( DAVID et POUYET, 1974)

Pl. 77, Fig. 1-4

* 1974

v. 1977 Schizostomella grinzingensis nov. sp. – David and Pouyet p. 203, Pl. 14, Fig. 7-8

Schizostomella grinzingensis DAVID et POUYET – Vávra p. 149

T y p e: The holotype is deposited in the Natural History Museum Vienna under the number 1878.11.124. ( David and Pouyet, 1974)

M a t e r i a l: Altogether 21 specimens were studied, mainly from the borehole Vranovice VK-1.

D i a g n o s i s: Colony erect, bilaminar. Autozooecia rectangular to trapezoidal with marginal areolar pores only. Aperture oval, large, smooth, no oral avicularia. Primary orifice with shallow sinus. Avicularia rarely developed on the proximal margin of the frontal wall, small, drop-like with a long palate tapering proximally (Pl. 77, Fig. 2). Secondary calcification well developed and hiding many structures, mainly avicularia. Gonozooecium unknown. Autozooecia (interior view) may show pores on peristomes, which look like a frontal perforation. These pores are only marginal areolar pores spread over the inner side of the frontal wall.

R e m a r k: Colonies are often strongly calcified, so sometimes only the shapes of the autozooecia are recognizable, no apertures are visible (Pl. 77, Fig. 1).

Very similar species is Adeona cellulosa ( MacGillivray, 1869) as illustrated by Bock (2010). It has however smaller avicularia arranged more proximally, marginal areolar pores only and large oval apertures with smooth margins. Schizostomella has large gonozooecia ( Bassler, 1953), which were not found in Schizostomella grinzingensis DAVID et POUYET, 1974 . The avicularia in the type specimens are circular, however in the material described above they are more drop-like, tapering proximally.

Up till now, no sinus was described on the primary orifice. The species attribution of the studied specimens is clear (due to the presence of avicularia, general characteristics of the colony). Obviously nobody studied the internal structure of the autozooecia until now.