Fabifenestella cf. quadratopora (Schulga-Nesterenko, 1939)

Nakrem, Hans Arne, Błażejowski, Błażej & Gaździcki, Andrzej, 2009, Lower Permian bryozoans from southern and central Spitsbergen, Svalbard, Acta Palaeontologica Polonica 54 (4), pp. 677-698 : 692-693

Fabifenestella cf. quadratopora

( Shul’ga−Nesterenko, 1939)

Fig. 8I.

Material examined.—Gipsvika, thin section PMO 170.935.

Description.— Fabifenestella with relatively small fenestrules and robust branches and dissepiments as compared with other species of this genus. There are 14–19 branches per 10 mm across colony and 14–15 dissepiments per 10 mm along colony. Branches 0.28–0.31 mm wide carrying scattered nodes (0.10 mm × 0.03 mm). Dissepiments 0.13–0.15 mm wide. Fenestrules 0.50–0.56 mm long and 0.26–0.32 mm wide. Apertures circular 0.10–0.11 mm in diameter. There are 17–19 apertures per 5 mm along branch; 2–2.5 bordering each fenestrule. Distance between apertural centers 0.26–0.30 mm along branch. Zooecial chambers fabiform in shallow tangential section; elongated−pentagonal in median to deep section. F. quadratopora occurs in the Sakmarian of the Russian Platfdorm, Russia (Shul'ga Nesterenko 1936).

Measurements.—See Table 8.

Genus Rectifenestella Morozova, 1974

Type species: Fenestella medvedkensis Shul'ga−Nesterenko , 1951, Kasimovian of the East European Platform, Russia .