Shulgapora cf. porosa ( Eichwald, 1860 )

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 : 696

Shulgapora cf. porosa ( Eichwald, 1860)

Fig. 8P, Q.

Material examined.—Gipsvika, thin section PMO 170.916, acetate peel 170.944.

Description.— Shulgapora with large, elongated fenestrules and slender branches producing a relatively open meshwork. There are 4–5 branches per 10 mm across colony and most commonly 4.5–5 fenestrules per 10 mm along colony. Branches bearing 5–6 rows of apertures are 1.25–1.50 mm wide. Branch surfaces are pierced by numerous small stylets. Dissepiments are 0.50–0.75 mm wide. Fenestrules are 1.15–1.80 mm long and 0.75–1.15 mm wide. Apertures are distinctly ovate, measuring 0.20–0.22 × 0.15–0.16 mm. There are 5–6 apertures per fenestrule. Distance between apertural centres is 0.34–0.42 along branch. Autozooecial chambers are rhomboid or less commonly hexagonal in median to deep tangential section.

Cyclozooecia (heterozooecia) up to 0.16 mm in diameter as measured deeper into the zooarium with an aperture diameter of 0.10 mm; these open on reverse side on branch. Cyclozooecia are locally also developed on obverse side of branches. S. porosa occurs in Sakmarian–Artinskian of Timan−Pechora ( Morozova and Kruchinina 1986).

Measurements.—See Table 11.