Celleporina sp.

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 : 96

Celleporina sp. Fig. 2 /6

M a t e r i a l: Three fragments of multilamellar colonies. Zooecia are recumbent at colony margins, suberect, arranged chaotically on the surface of the colony. Zooecia are oval to circular with convex, nonporous frontal walls and rare marginal areolar pores. The terminal orifice has a well-developed, wide sinus and are situated on a short peristome. Condyles are slightly prominent. Avicularia sub-oral, adventitious, usually one near to the proximal margin of each orifice, rarely paired. Ovicells are hyperstomial, prominent and globular, with a perforated frontal area and smooth, nonporous margins. The perforated area is subcircular to semilunar with 5 to 7 thick radial ridges. Ovicellate zooecia may develop usually two suboral avicularia.

R e m a r k s: Due to the presence of a sinuate orifice, smooth frontal wall with scattered marginal pores, hyperstomial ovicell with perforated frontal area and the absence of oral spines, this species is assigned to Celleporina as understand by HAYWARD & RYLAND (1999).

No known species of Celleporina has the combination of thick radial ribs in the perforated area of the ovicells and only one suboral avicularium. We have however not enough specimens to erect a new species.

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.