Reteporella vladkae, ZÁGORŠEK, 2010

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 vladkae sp. n.

Pl. 133, Fig. 1-6

v. * 2009 Reteporella sp. – Zágoršek et al. p. 482, Fig. 10G

D i a g n o s i s: Net-likecolonieswithnarrow, biserial or triserial branches and large fenestrulae. Frontal wall smooth with large areolar pores. Aperture is circular, hidden, a pseudo-spiramen is not formed. Suboral avicularia are small, deeply immersed, frontal avicularia rare, dorsal avicularia absent, additional large avicularia on branching areas. Dorsal side without any avicularia. Ovicells deeply immersed with a very narrow, almost closed frontal fissure.

H o l o t y p e: The specimen from the section at Kralice nad Oslavou, illustrated on Pl. 133, Fig. 1-2 is deposit- ed in the National Museum Prague under the number PM2 – P 01782.

P a r a t y p e s: 4 specimens from the section at Kralice nad Oslavou, are deposited in the National Museum Prague under numbers PM2 – P 01783 to P 01786

A d d i t i o n a l m a t e r i a l: 10 specimens from the section at Kralice nad Oslavou are deposited in the National Museum Prague .

D e r i v a t i o n o m i n i s: Derived from the name Vlaďka, in honour of Dr. Vladimíra Jašková from the Prostějov museum who helped me very much in my fieldwork.

L o c u s t y p i c u s: Kralice nad Oslavou, sample KRA-S: ( Zágoršek et al., 2009).

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: (in micro meters = µm; x = = average):

diameter of branch: 445-668; x = 546

length of fenestrula: 1583

width of fenestrula: 586

length of autozooecia: 483-508; x = 498

width of autozooecia: 164-227; x = 197

length of autozooecial aperture: 95-111; x = 105

width of autozooecial aperture: 100-110; x = 105

length of ovicells: 174-216; x = 193

width of ovicells: 52-60; x = 56

length of suboral avicularia: 67-94; x = 77

width of suboral avicularia: 44-82; x = 58

length of dorsal avicularia: 242-244; x = 243

width of dorsal avicularia: 51-52; x = 52

diameter of dorsal pores: 19-36; x = 25

D e s c r i p t i o n: Colony delicate, branches narrow, fenestrulae wide and long. Branches biserial, rarely with three rows of autozooecia. Autozooecial frontal walls smooth with large areolar pores. Apertures circular, hidden in deep peristomes, pseudo-spiramen not formed. Suboral avicularia small, deeply immersed, situated at the proximal margin of the aperture, oval with a pivotal bar. Rarely an identical type of avicularia may be situated on the frontal

163 wall also. Dorsal side without any avicularia. Large avicularia situated on the lateral sides of the branch margin, usually in the area of branch bifurcation. This avicularia are very narrow and long with a pivotal bar. Ovicells deeply immersed with a very narrow, almost closed frontal fissure.

C o m p a r i s o n: The species is similar to Reteporella cf. beaniana ( KING, 1846) with respect to the position and shape of the suboral avicularia, the size of areolar pores and the general shape of the colony (delicate branches and large fenestrulae); it differs however mainly in having a very narrow frontal fissure on the ovicell and by the absence of any dorsal avicularia. Also the shape of avicularia, which are situated near a bifurcation, is different, they are very narrow in Reteporella vladkae sp. n.

Reteporella vladkae sp. n. differs from other species by the absence of avicularia on the dorsal side of the colony, by the small frontal avicularia and the very narrow frontal fissure on the ovicell.

O c c u r r e n c e: Only in the section at Kralice nad Oslavou