Porella regularis ( REUSS , 1874)

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 regularis ( REUSS, 1874)

Pl. 85, Fig. 1-5

v. * 1874 Lepralia regularis m. – Reuss p. 168, Pl. 2, Fig. 1

1974 Hippadenella regularis ( REUSS, 1874) – David and Pouyet p. 177, Pl. 10, Fig. 5 (cum syn.)

T y p e: Lectotype stored in the Natural History Museum Vienna under the number 1878.11.60 ( David and Pouyet, 1974)

M a t e r i a l: Altogether 19 specimens were studied, most of them with preserved ovicells.

D i a g n o s i s: Colony encrusting, rarely forming a multilayer masses. Autozooecia oval with 18-20 marginal areolar pores. Frontal wall convex, with slightly visible radial ribs. Primary orifice with a small lyrula. No oral spines. Avicularia adventitious, suboral, small with pivotal bar. Ovicell slightly immersed, globular, frontal wall not perforate.

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 . Ovicells were not known in this species until now. One studied specimen shows ovicells, with an endoecium at the proximal edge of the ovicell.

The type specimen shows a large spatulate avicularium, very similar to those usually developed in the genus Umbonula . Other features are identical with the described material.

Porella nuda ( REUSS, 1874)

Pl. 85, Fig. 6

v. * 1874 Lepralia nuda m. – Reuss p. 173, Pl. 6, Fig. 10

1974 Smittina nuda ( REUSS, 1847) – David and Pouyet p. 190, Pl. 10, Fig. 8

1977 Smittina nuda ( REUSS, 1847) – Vávra p. 142

1989 Porella nuda ( REUSS, 1847) – Schmid p. 37, Pl. 10, Fig. 3, 8

T y p e: Holotype from Nussdorf stored in the Natural History Museum Vienna under the number 1878.11.79 ( Vávra, 1977).

M a t e r i a l: Altogether 4 specimens were studied, but only one of them is well preserved.

D i a g n o s i s: Colony encrusting. Autozooecia elongate, hexagonal with a convex frontal wall and large marginal areolar pores. Lateral walls visible. Aperture oval. Suboral avicularium small, hidden inside the aperture. Ovicell not known.

R e m a r k s: Differs from Porella circumornata ( REUSS, 1847) in its convex frontal wall, visible lateral walls and an oval aperture.