Bitectiporidae MACGILLIVRAY, 1895

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

Family Bitectiporidae MACGILLIVRAY, 1895 Genus Schizomavella CANU et BASSLER, 1917

Colony encrusting. Autozooecia with strongly perforat- ed frontal wall. Apertures with prominent sinus and condyles. Oral spines may be present. Ovicell partly immersed, ectoecium with pores or with a frontal fissure. Avicularia adventitious.

Schizomavella protuberans ( REUSS, 1847) Pl. 101, Fig. 1-5

? * 1847

partim 1977 2007 Cellepora protuberans m. – Reuss p. 89, Pl. 10, Fig. 26

Schizomavella tenella ( REUSS, 1847) – Vávra p. 126 Schizomavella protuberans ( REUSS, 1847) – Zágoršek et al. p. 211, Fig. 9A-B (cum syn.)

T y p e: The type material was not found in the Reuss collection of the Natural History Museum Vienna; perhaps it has been lost .

M a t e r i a l: A very common species; 67 specimens from different sections were studied in detail.

D i a g n o s i s: Colony encrusting, unilaminar with autozooecia arranged in more or less parallel rows. Autozooecia are rectangular in shape, with a strongly convex frontal wall. Frontal wall is perforated by large pseudopores (diameter about 25 µm). Lateral walls are narrow, but always visible between adjacent autozooecia, slightly raised above the frontal wall. Apertures with a sinus, oral spines may be present. Avicularia are adventitious, suboral with a pivotal bar; they are always situated proximally and very close to the aperture in a median position, tapering proximally and associated with a prominent umbo. The umbo is always nonporous, often very large. Ovicells are hyperstomial, their size is about half that of an autozooecium. Ovicell walls consist of two parts. Frontal part of the ovicell wall is flat, nonporous, smooth, and slightly granular with scattered pores occurring on its proximal margin. Lateral part of the ovicell wall is convex, smooth, without any pores. Sometimes these two parts are not distinguishable, due to preservation.

R e m a r k s: Schizomavella protuberans ( REUSS, 1847) and Schizomavella tenella ( REUSS, 1847) were synonymis- ed by Schmid (1989). However Zágoršek et al. (2007) suggested keeping these species separate due to the presence of different structures in the ovicells. For detailed discussion of this species see Zágoršek et al. (2007).