Hippopleurifera, CANU, 1927

Zágoršek, K. & Fordinál, K., 2006, Lower Sarmatian Bryozoa from brackish sediment in the northern part of the Danube Basin (Dubová, Slovakia), Linzer biologische Beiträge 38 (1), pp. 93-99 : 95

Hippopleurifera cf. semicristata ( REUSS 1848) Fig. 2 /4

*1848 Cellepora semicristata m. – REUSS p. 82, Pl. 10, Fig. 3

1974 Hippopleurifera semicristata (REUSS) – DAVID & POUYET p. 153, Pl. 11, Fig. 7

1977 Hippopleurifera semicristata (REUSS) – VÁVRA p. 113 (cum. syn.)

M a t e r i a l: One fragment of an encrusting colony, with zooecia arranged in irregular series. Zooecia have a characteristic convex frontal wall perforated by numerous, large pores. The orifice is very wide with well-developed cardelles. No ovicells and avicularia observed.

R e m a r k s: The specimen studied exhibits the characteristic development of the frontal wall and orifice as seen in Hippopleurifera semicristata ( REUSS 1848), which has a nonporous area proximal of the orifice. Because ovicells and avicularia were not developed on the studied specimen, and this species has never been reported from brackish water, species attribution remains uncertain.

D i s t r i b u t i o n: Badenian (Miocene): Vienna basin: Eisenstadt ( Austria – VÁVRA 1977), Nussdorf ( Austria – SCHMID 1989), Hlohovec (Czech – VÁVRA 1977), Carpathian Foredeep: Židlochovice, Kralice and Holubice (Czech – personal observation of ZÁGORŠEK), Miechowitz ( Poland – VÁVRA 1977).

Family Hippoporinidae BASSLER, 1935

Genus Hippadenella CANU & BASSLER, 1917

Figures

Fig. 2: Bryozoa: (1-2) Tubulipora cumulus (Sinzow 1892). Note marked concentric grown lines, apertures arranged in fascicles and porous frontal walls. (3) Hippadenella regularis (Reuss 1874). General view showing wide apertures with characteristic key-shaped suboral avicularium (visible on lower rows of zooecia). (4) Hippopleurifera cf. semicristata (REUSS 1848), fragment of colony with characteristically developed apertures and large pores on frontal wall. (5) Celleporina sp. general view showing small suboral avicularia, lateral areolar pores and ovicells with semicircular windows. (6) Schizoporella tetragona (REUSS 1848). Detail of few zooecia with visible characteristic aperture with wide sinus and large oral avicularia with prominent pivotal bar. All pictures were made in Paleontological Institute of Vienna University in SEM Jeol type JSM-6400 by Dr. K. Zágoršek. Scale bar 100 µm.