Reteporella cf. beaniana ( KING , 1846)

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

Reteporella cf. beaniana ( KING, 1846)

Pl. 130, Fig. 1-6

? 1999

Reteporella beaniana ( KING, 1846) – Hayward and Ryl- and p. 368 (cum syn.)

M a t e r i a l: Altogether 9 well-preserved specimens were studied from different sections.

D i a g n o s i s: Colony reticulating, forming a net with fenestrulae. Branches biserial or triserial. Frontal wall smooth with large areolar pores. Aperture is circular, hidden in a short peristome, no basal pseudo-spiramen formed. Suboral avicularia are small, oval, with a pivotal bar; avicularia situated on the proximal margin of the aperture. Additional oval avicularia situated on the frontal wall, usually slightly larger than the suboral avicularia. The same type of avicularia, but slightly smaller, also occurs on the dorsal side of the branches. Additional large avicularia are often situated on the margins of a branching area. Ovicells are deeply immersed; they show a wide, open frontal fissure.

R e m a r k s: Characteristic features are the presence of small avicularia on the dorsal side of the colony, small frontal avicularia, large areolar pores and the wide frontal fissure on the ovicell.

Although the species is reported only from recent seas, the similarity is too large to ignore. The only differences between recent material as described by Hayward and Ryland (1999) and our fossil material exist with respect to the development of oral spines. Recent specimens have a single spine on each side of the aperture which were not observed in the fossil material. All other features of the species as described by Hayward and Ryland (1999) are observable in the studied material.