Hippopleurifera CANU et BASSLER, 1925

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

Genus Hippopleurifera CANU et BASSLER, 1925

Colony encrusting. Frontal wall with two or more rows of areolar pores, central area nonporous, but sometimes very reduced. Apertures large, oval with prominent condyles. Oral spines present. Avicularia adventitious, situated laterally. Ovicell globular, slightly immersed.

Hippopleurifera hypsostoma ( REUSS, 1874) Pl. 96, Fig. 1

v. * 1874 Lepralia hypsostoma m. – Reuss p. 162, pl. 5, Fig. 9, 10 1977 Hippopleurifera hypsostoma ( REUSS, 1874) – Vávra

p. 112 (cum syn.)

T y p e: Lectotype from Podivín is deposited in the Natural History Museum Vienna under the number 1878.11.43 (defined by Vávra, 1977)

M a t e r i a l: Only one specimen from the section Hlohovec was found.

D i a g n o s i s: Colony encrusting. Autozooecia elongate with two rows of circular marginal areolar pores, very large nonporous frontal wall. Apertures with clearly visible condyles and oral spines. Avicularia small, oval, sometimes in pairs, situated in the middle of the frontal wall, close to the margin. Ovicell globular, its frontal wall unknown.

R e m a r k s: The main differences when compared with other species of Hippopleurifera are the elongate autozooecia and the position of the avicularia on the frontal wall.

Hippopleurifera sedgwicki (MILNE-EDWARDS, 1836) Pl. 96, Fig. 2-5

1970

v. 1977

Hippopleurifera sedgwicki (MILNE-EDWARDS, 1836) – David, Mongereau and Pouyet p. 127, Fig. 13, Pl. 5, Fig. 1,2 (cum syn.)

Hippopleurifera sedgwicki (MILNE-EDWARDS, 1836) – Vávra p. 113 (cum syn.)

M a t e r i a l: Altogether 23 specimens were studied from many different sections. The species is one of the most common in the Moravian part of the Carpathian Foredeep.

D i a g n o s i s: Colony encrusting, probably having grown on algae, back side of the colony always visible. Autozooecia oval with many rows of circular marginal areolar pores, the nonporous part of the frontal wall is very reduced. Apertures with clearly visible condyles and 3-5 oral spines. Avicularia small, oval, sometimes in pairs, situated proximo-laterally to the aperture with an oblique, tapering rostrum. Ovicell globular with two large circular windows on the ectoecium can be recognized only if the porous endoecium is at all visible. Back side of the colony with smooth dorsal walls and characteristic large, oval openings.

R e m a r k s: If no ovicell is present, the main differences when compared with Hippopleurifera semicristata ( REUSS, 1847) are the smaller avicularia, the reduced frontal nonporous wall and the circular areolar pores.

Hippopleurifera semicristata ( REUSS, 1847) Pl. 97, Fig. 1-7

v. * 1847 Cellepora semicristata m. – Reuss p. 82, Pl. 10, Fig. 3

1974 Hippopleurifera semicristata ( REUSS, 1847) – David and Pouyet p. 153, Pl. 11, Fig. 7.

v. 1977 Hippopleurifera semicristata ( REUSS, 1847) – Vávra p. 113 (cum syn.)

2006 Hippopleurifera semicristata ( REUSS, 1847) – Berning p. 75, Fig. 84, 85 (cum syn.)

T y p e: Lectotype from Eisenstadt is deposited in the Natural History Museum Vienna under the number 1867.40.167 (established by David and Pouyet, 1974).

M a t e r i a l: A very common species, altogether more than 26 specimens from different sections were studied in detail. An additional 2 specimens from the Reuss collection stored in the Natural History Museum Vienna under the number1859.45.655 from the section Hlohovec were examined .

D i a g n o s i s: Colony encrusting. Autozooecia oval with two (rarely three) rows of elongate marginal areolar pores. Apertures with clearly visible condyles and 5-7 oral spines. Avicularia large, sometimes in pairs, situated proximo-laterally to the aperture with enlarged rostrum tapering distally. Ovicell globular with radial or irregularly arranged ribs on its frontal wall.

R e m a r k: Hippopleurifera biariculata ( REUSS, 1847) is very similar to Hippopleurifera semicristata ( REUSS, 1847) with respect to the development of the frontal wall. The lectotype of Hippopleurifera biauriculata (Natural History Museum Vienna 1859.50.748) from Eisenstadt is an erect, bilaminar colony without oral spines and ovicell, and moreover the avicularia are situated very closely and laterally to the aperture. Hippopleurifera semicristata ( REUSS, 1847) has encrusting colonies with oral spines and avicularia situated more proximo-laterally to the aperture.