Fistulipora sp.

Nekhorosheva, Lyudmila V., 2002, Paleozoic Bryozoa from Severnaya Zemlya (Russian Arctic), Geodiversitas 24 (2), pp. 317-327 : 320

Fistulipora sp. ( Fig. 2A, B ; Table 1)

MATERIAL EXAMINED. — Two fragmented colonies, CNIGR Museum, 1/13009, 2/13009.

OCCURRENCE. — Lower Devonian, Emsian, Rusanov Formation; Pioneer Island, Govorlivaya River, loc. 2369.

DESCRIPTION

The description is based on two small fragments of Fistulipora . These specimens have tubular or encrusting zoarium with smooth surface and maculae on it. Maximum colony width is 1.80- 2.30 mm; minimum width is about 1.10- 1.30 mm. Zooecial apertures are rounded or rounded to ovate, average 0.21-0.25 mm in diameter. There are about four to five zooecial apertures per 2 mm in any direction. Thin-walled zooecial tubes contain thin diaphragms in 0.08- 0.21 mm apart. Vesicular tissue formed by blister-like vesicles 0.06-0.15 mm in diameter. One or two rows of the vesicles are arranged between zooecial tubes. Vesicles are densely packed within maculae, where zooecia are lacking.

COMPARISON

The specific affinities of the investigated specimens of Fistulipora sp. cannot be determined. Based on the mentioned measurement features, the current specimens have, however, characters in common with F. nordica L. Nekhorosheva, 1961 ( Nekhorosheva 1968: 51, pl. II, figs 1-3) described from Emsian: Taribigai beds of Taimyr.

Figures

FIG. 2. — A, B, Fistulipora sp.; A, longitudinal section, CNIGR Museum, 1a/13009; B, transverse section, CNIGR Museum, 2a/13009, Rusanov Formation, Emsian; Pioneer Island, Govorlivaya River, loc. 2369; C-E, Fistulotrypa sp. A; C, transverse section, CNIGR Museum, 3a/13009; D, tangential section, CNIGR Museum, 3b/13009; E, longitudinal section, showing endozone without vesicular tissue, CNIGR Museum, 3c/13009, Rusanov Formation, Emsian; Pioneer Island, loc. 2492; F, Halloporina severozemelica n. sp., transverse section, CNIGR Museum, 5a/13009, Ozernaya Formation, Middle Ordovician; October Revolution Island, Strojnaya River, loc. 49. Scale bars: A-E, 1 mm; F, 0.5 mm.