Anomalotoechus sp.

Tolokonnikova, Zoya A. & Fedorov, Petr V., 2022, Late Devonian-early Carboniferous bryozoans from Zhankurgan (Greater Karatau, Kazakhstan) - taxonomy and palaeobiogeographical implications, Zootaxa 5196 (2), pp. 252-264 : 257-258

Anomalotoechus sp.

Figs 3F, G , Table 3

Material. SibGIU 12/26 (sections).

Description. Encrusting colony, 0.89–1.25 mm in thickness. The central hollow cylinder is 0.20x 0.24 mm in diameter. Autozooecia growing from 0.02 mm thick epitheca. Exozone indistinctly separated from endozone. Autozooecia having polygonal cross sections. Autozooecial apertures rounded-polygonal. Straight and inclined autozooecial diaphragms abundant; located at a distance of 0.04–0.10 mm (more often 0.08 mm). Exilazooecia rare, short. Acanthostyles having distinct cores and laminated sheaths. Autozooecial wall 0.01 mm thick in endozone and irregularly thickened in exozones. Maculae not observed.

Comparison. The present material is similar to A. pervulgatus Lavrentjeva, 2001 from the lower Famennian of Transcaucasia ( Lavrentjeva 2001), but differs in small acanthostyles (0.02 mm vs. 0.04–0.08 mm in A. pervulgatus ). The present material differs from A. pojarkovi Modzalevskaya, 1968 from the lower Famennian of Western Talas (Southern Tien-Shan) in shape of colony (encrusting vs. branched in A. pojarkovi ), smaller apertures (0.12–0.16 mm vs. 0.21–0.26 mm in A. pojarkovi ), presence of diaphragms in endo- and exozone ( Modzalevskaya & Orlovskij 1968). The available material is not sufficient to make a comprehensive comparison.

Stratigraphical and geographical ranges. Ermaksy Formation, lower-middle Famennian (upper Devonian); Karatau, Zhankurgan outcrop, Kazakhstan.

Figures

FIGURE 3. Early-middle Famennian bryozoans from Zhankurgan outcrop. SibGIU 12/25: A-E Cyphotrypa sp. A, B. transverse section; C, D. longitudinal section showing abundant diaphragms (arrow) and wall microstructure with bulges; E. tangential section. SibGIU 12/26: F, G Anomalotoechus sp. F. tangential section; G. transverse section; SibGIU 12/27: H, I Pseudobatostomella sp. H, I. longitudinal section showing short exilazooecia (arrow).