Reteporella hluchovensis, 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 hluchovensis sp. n.

Pl. 131, Fig. 1-4

D i a g n o s i s: Colony robust, reticulating, forming ‘nets’. Branches with four to six rows of autozooecia. Frontal wall smooth with very small areolar pores. Aperture is circular, hidden in a short peristome, basal pseudo-spiramen formed. Avicularia suboral, hidden. The ovicells are almost entirely immersed into the dorsal part of the autozooecia, frontal wall of the ovicells are very narrow, the whole frontal area occupied by a wide frontal fissure.

H o l o t y p e: The specimen illustrated on Pl. 131, Fig. 1-2, from the locality Hluchov, deposited in the National Museum Prague under the number PM2 – P 01775.

P a r a t y p e s: 2 specimens from the locality Hluchov, deposited in the National Museum Prague under numbers PM2 – P 01776 and P 01777 .

A d d i t i o n a l m a t e r i a l: 8 specimens from the locality Hluchov, deposited in the National museum Prague within the bryozoan collection .

D e r i v a t i o n o m i n i s: Due to the occurrence in the section at Hluchov.

L o c u s t y p i c u s: Hluchov.

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

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

diameter of branch: 672-926; x = 765

length of fenestrulae: 580-876; x = 680

width of fenestrulae: 231-330; x = 288

length of autozooecia: 456-492; x = 468

width of autozooecia: 147-165; x = 153

length of autozooecial aperture: 88-121; x = 108

width of autozooecial aperture: 68-106; x = 89

length of sinus: 34-38; x = 36

width of sinus: 10-13; x = 12

D e s c r i p t i o n: Colony robust, reticulating, branches wide, fenestrulae narrow and short. Autozooecia in four to six longitudinal rows. Frontal wall smooth with very small areolar pores. Aperture circular, hidden in a short peristome, basal pseudo-spiramen formed. Avicularia deeply immersed into the peristome, relatively hidden, almost not visible. The ovicells are almost entirely immersed into the dorsal part of autozooecia, frontal walls of ovicells very narrow, whole frontal area occupied by a wide frontal fissure. Dorsal side of the colony without any avicularia.

C o m p a r i s o n: This species differs from Reteporella cf. beaniana ( KING, 1846) by the almost complete absence of any avicularia on dorsal side and formation of rather robust colonies. The ovicells with their wide frontal fissure are however rather similar. Characteristic features are the robust colonies, the deeply immersed ovicells with their wide frontal fissures, the hidden avicularia on the frontal side and also absence of avicularia on the dorsal side of the colony branches.

O c c u r r e n c e: Also in the section at Podbřežice, sample P-6.