Schizoporella tetragona ( REUSS 1848)

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 : 94-95

Schizoporella tetragona ( REUSS 1848) Fig. 2 /6

v* 1848 Cellepora teragona m. – REUSS p. 78, Pl. 9, Fig. 19

1957 Schizoporella tetragona spongitiformis SAULEA- BOCEC 1943 – BOBIES p. 87, Pl. 7, Fig. 6, Pl. 8, Fig. 7-11, Pl. 10, Fig. 28

1974 Schizoporella tetragona (REUSS) – DAVID & POUYET p. 156, Pl. 15, Fig. 1

v. 1977 Schizoporella tetragona (REUSS) – VÁVRA p. 119 (cum. syn.)

1989 Schizoporella tetragona (REUSS) – SCHMID p. 43, Pl. 12, Fig. 8

M a t e r i a l: One fragment of an encrusting colony, with zooecia arranged in ir- regular series. Zooecia have a characteristic quadrate shape with a prominent suboral avicularium and orifice with a wide sinus. Ovicells are hyperstomial, globular with granular frontal wall.

R e m a r k s: The single specimen exhibits all of the characteristic features of this species, except that the avicularia are a little larger than in the type material deposited in the Natural History Museum in Vienna. This species has also reported from brackish water deposits, although very rarely.

BOBIES (1957) listed multilamellar colonies of this species under a different subspecies name ( Schizoporella tetragona spongitiformis). There are no differences, however in morphology of the autozooecia between these subspecies and therefore the unusual growth form is perhaps only an adaptation to particular environmental conditions.

D i s t r i b u t i o n: widely distributed taxon around Alpine-Carpathians region:

Badenian (Miocene): many localities in Vienna Basin, mainly in Nussdorf, Eisenstadt ( Austria – SCHMID 1989) and Hlohovec, Mikulov (Czech – personal observation of ZÁGORŠEK), many localities in Carpathian Foredeep mainly in Židlochovice, Podbřežice and Kralice nad Oslavou (personal observation of ZÁGORŠEK).

Sarmatian (Miocene): Schleinbach, Kalch ( Austria – BOBIES 1957), Lapusna – d`Orheiu (Bessarabian – BOBIES 1957).

Superfamily Lepralielloidea VIGNEAUX, 1949

Family Umbonulidae CANU, 1904

Genus Hippopleurifera CANU, 1927

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.