Clausotrypa monticola ( Eichwald, 1860 )

Ernst, Andrej & Minwegen, Elke, 2006, Late Carboniferous bryozoans from La Hermida, Spain, Acta Palaeontologica Polonica 51 (3), pp. 569-588 : 578-579

Clausotrypa monticola ( Eichwald, 1860)

Fig. 6D–I; Table 7.

1860 Myriolithes monticola sp. nov.; Eichwald 1860: 452, pl. 25: 6a, b.

1938 Clausotrypa monticola ( Eichwald, 1860) ; Nikiforova 1939: 181, pl. 14: 4–7, pl. 15: 7–10.

1941 Clausotrypa monticola ( Eichwald, 1860) ; Schulga−Nesterenko 1941: 219, pl. 13: 3–6.

1981 Clausotrypa monticola ( Eichwald, 1860) ; Morozova and Krutchinina 1981: 67, pl. 20: 3, 4.

2003 Clausotrypa monticola ( Eichwald, 1860) ; Ernst 2003: 60, pl. 3: 2–5.

Material.— SMF 1723, 1733, 1739, S1748–1750, 1754, 1768, 1773, 1785–1788, 1797 (and about 30 additional fragments).

Description.—Cylindrical branches, 1.00– 2.25 mm in diameter. Autozooecia long, cylindrical, budding parallel to the branch axis for a long distance, often building distinct axial bundle, turning gently to the colony surface. Autozooecial apertures oval, spaced 2.5–4 longitudinally and 5–6.5 diagonally in 2 mm. Diaphragms rare in autozooecia. Exilazooecia? (vesicles) numerous, restricted mostly to exozone, in 1–3 rows separating autozooecial apertures, having frequent diaphragms. Acanthostyles abundant, originating in the endozone, having clear calcite cores, 4–5 around each aperture.

Discussion.— Clausotrypa monticola ( Eichwald, 1860) is similar to C. conferta Bassler, 1929 from the Lower Permian of Indonesia and Thailand. However, the latter species has smaller acanthostyles and larger autozooecial apertures (0.15–0.25 versus 0.12–0.18 mm in Clausotrypa monticola ).

Stratigraphic and geographic range.—Upper Carboniferous to Lower Permian of Russia and Arctic. Carnic Alps ( Austria); Upper Carboniferous, Lower Pseudoschwagerina Formation (Upper Gzhelian). Picos de Europa Formation, Moscovian, Upper Carboniferous; La Hermida, Spain.