Streblotrypa (Streblascopora) nikiforovae ( Morozova, 1955 )

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

Streblotrypa (Streblascopora) nikiforovae ( Morozova, 1955)

Fig. 5G–I.

1955 Streblotrypa nikiforovae sp. nov.; Morozova 1955: 62–63, pl. 9: 2.

Material.— SMF 1762, 1781 (and three additional fragments).

Description. —Ramose branched colonies, 0.75–1.15 mm in diameter. Axial bundle 0.21–0.22 mm in diameter, containing 9–13 axial zooecia, arranged in 3–4 rows in longitudinal section. Autozooecial apertures oval, 0.09–0.11 mm in width, spaced 4.5 per 2 mm of the branch length. Metazooecia rounded, arranged in 2–3 longitudinal rows between autozooecia, 0.03– 0.04 mm in diameter, 6–10 spaced in the interapertural area. Diaphragms and hemisepta absent.

Discussion.— Streblotrypa (Streblascopora) nikiforovae ( Morozova, 1955) is very similar to S. (S.) prisca ( Gabb and Horn, 1862) from the Stephanian of the USA ( Hageman 1993). The latter species differs in the larger number of metazooecia (4–19 versus 6–10 in present material), and in having superior and inferior hemisepta. The species described as Streblotrypa sp. by Gonzáles and Suárez Andréz (1999) is very similar superficially. However, the internal structure is unknown in this species.

Stratigraphic and geographic range.—Upper Carboniferous (Moscovian); Ukraine. Picos de Europa Formation, Moscovian, Upper Carboniferous; La Hermida, Spain.