Porella circumornata ( 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

Porella circumornata ( REUSS, 1847)

Pl. 84, Fig. 1-5

v. * 1847 Cellepora circumornata m. – Reuss p. 85, Pl. 10, Fig. 11

1977 Smittina circumornata ( REUSS, 1847) – Vávra p. 141 (cum syn.)

1989 Escharella? circumornata ( REUSS, 1847) – Schmid p. 37, Pl. 10, Fig. 7

T y p e: Holotype from Nussdorf is stored in the Natural History Museum Vienna under the number 1878.11.80 ( Vávra, 1977).

M a t e r i a l: Altogether 7 specimens were studied from different sections.

D i a g n o s i s: Colony encrusting. Autozooecia hexagonal to oval with a flat frontal wall and very large marginal areolar pores. Aperture semilunar with straight proximal margin. Suboral avicularium small, hidden inside the aperture. Ovicell deeply immersed, with flat frontal wall.

R e m a r k s: Due to the presence of a small lyrula, a suboral avicularium and the absence of oral spines this species is listed under Porella GRAY, 1847 (as understood among others by Gordon, 1984 and Hayward and Ryland, 1999).

This species differs from Porella regularis ( REUSS, 1874) mainly due to the deeply immersed ovicell and the slightly larger avicularia.

The type has a very well developed lyrula and a slightly smaller ovicell than the described material. Other features are identical.