Ferganula PHEOPHANOVA, 1965

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 Ferganula PHEOPHANOVA, 1965

Colony encrusting. Autozooecia hexagonal to oval, growing in rows. Frontal wall perforated by numerous pores, no lateral marginal areolar pores. Aperture with a well developed shallow sinus, no oral spines. Avicularia small, sub-oral, sometimes absent. Ovicell small, deeply immersed into the distal part of the autozooecia, its frontal wall possesses pores.

R e m a r k s: A similar genus – Stylopoma LEVINSEN, 1909 as revised by Tilbrook et al. (2001) – has a frontal shield evenly perforated by numerous pores, with a marginal series of larger pores, it has a very narrow sinus, often vicarious avicularia and a very prominent, globular ovicell. Similar genus is also Calyptotheca HARMER, 1957 as re-described by GORDON (1989) differs however in having dimorphic apertures and much larger ovicells.

Ferganula rousinovensis sp. n. Pl. 108, Fig. 1-6

D i a g n o s i s: Encrustingcolony,autozooeciaovalto hexagonal, growing in more or less regular rows with visible lateral walls. Frontal wall heavily perforated by pores. Apertures with sinus and clearly visible condyles. No avicularia. Ovicell small, semilunar, deeply immersed into the distal part of the autozooecia, with a strongly porous frontal wall.

H o l o t y p e: The specimen illustrated in Pl. 108, Fig. 1-3, from the section Rousínov pumpa, deposited in the National Museum Prague under the number PM2 – P 01591.

P a r a t y p e s: 7 specimens from the section Rousínov pumpa, deposited in the National Museum Prague under numbers PM2 – P 01592 to P 01598 .

D e r i v a t i o n o m i n i s: Due to the name Rousínov, the type locality of this taxon.

L o c u s t y p i c u s: Rousínov pumpa.

S t r a t u m t y p i c u m: Langhian – Lower Badenian.

M e a s u r e m e n t s: (inmicrometers=µm;x= average):

length of autozooecia: 333-842; x = 613

width of autozooecia: 249-588; x = 375

length of aperture: 76-216; x = 154

width of aperture: 99-229; x = 156

length of ovicell: 220-250; x = 234

width of ovicell:: 410-416; x = 414

diameter of frontal pores: 17-25; x = 21

length of kenozooecia: 90-562; x = 326

width of kenozooecia: 45-182; x = 114

D e s c r i p t i o n: Colony encrusting, autozooecia growing in regular rows. Autozooecia oval to hexagonal, separated by clearly visible lateral walls. Frontal wall slightly convex, perforated by numerous, small pores of identical size (no visible difference between pores situated more centrally or more laterally). Apertures with a shallow sinus and a narrow, extensively calcified lip. Condyles clearly visible. Ovicell small, semilunar, deeply immersed into the distal part of the autozooecia, with porous frontal wall. Its pores may be larger than the pores on the frontal wall. Kenozooecia drop-like, narrow and long, rarely distributed among autozooecia. No avicularia observed.

C o m p a r i s o n: A similar species is Ferganula sumsarica PHEOPHANOVA, 1966 , which also does not develop avicularia, but has a less porous frontal wall and a less prominent sinus. Similar ovicells have been described in Ferganula turkestanensis PHEOPHANOVA, 1966 , a taxon which however has a pair of small avicularia.

R e m a r k s: Due to the presence of a perforated frontal wall, a shallow sinus and a deeply immersed small ovicell perforated by numerous pores and due to the absence of any oral spines, this species belongs to Ferganula as described by Pheophanova (1966).

O c c u r r e n c e: Podbřežice, Hluchov and perhaps also in Romania (section at Girbova de Sus in Transylvania).