Streblotrypa (Streblotrypa) Vine, 1885

Ernst, Andrej & Minwegen, Elke, 2006, Late Carboniferous bryozoans from La Hermida, Spain, Acta Palaeontologica Polonica 51 (3), pp. 569-588 : 577-578

Subgenus Streblotrypa (Streblotrypa) Vine, 1885

Type species: Streblotrypa nicklesi Vine, 1885 , by original designation; Middle Carboniferous , England .

Diagnosis.—Ramose colonies. Indistinct bundle of about 10 or fewer axial zooecia in the endozone. Diaphragms rare. Hemisepta usually present. Metazooecia usually restricted to rows between the autozooecial apertures; styles usually lacking (translated after Gorjunova 1985).

Remarks.— Streblotrypa (Streblotrypa) Vine, 1885 differs from S. (Streblascopora) Bassler, 1929 by having an indistinctly defined axial bundle and well−developed hemisepta.

Description.—Ramose colony with small axial cylinder and Stratigraphic and geographic range.—Carboniferous to Perdistinct exozone, 1.05–1.68 mm in diameter. Axial cylinder mian; worldwide. 0.17–0.45 mm in diameter. Autozooecia budding in spiral pattern around axial cylinder, rhomboidal in cross−section. Streblotrypa (Streblotrypa) sp. Autozooecial apertures oval, arranged in regular diagonal Fig. 5E, F. rows, 5 longitudinally and 7–8 diagonally. Macroacantho− Material.— SMF 1780, 1732. styles large, arranged biserially in interspaces between aper−

Description.—Ramose colony, 0.68–0.78 mm in diameter. tures. Microacanthostyles small, arranged in one row between

Axial bundle not clearly defined. Median axis indistinct. macroacanthostyles. Superior hemiseptum blunt, obscure, Autozooecial apertures oval, 0.09–0.10 mm in width, spaced positioned far distally; inferior hemiseptum long, straight or 4 per 2 mm of the branch length and 6 diagonally in the same curved slightly to distal, restricting about the third of the distance. Metazooecia rounded, arranged in 3–4 longitudinal autozooecial lumen, positioned roughly in the middle of the rows between autozooecia, 0.02–0.03 mm in diameter, autozooecium. 16–24 spaced on the interapertural area. Diaphragms and Discussion.—The present material is very similar to Rhabdo− hemisepta absent. meson protalissimum Ceretti, 1963 from the Upper Carbonif− Remark.— Streblotrypa (Streblotrypa) angulatum Karklins , erous of the Italian Carnic Alps. This species, which has been 1986 from the Late Mississippian of Utah, USA is very similar described and depicted only superficially from a single exam− to the present material. However, this American species has ple, possesses two macroacanthostyles between the apertures, thicker branches (0.82–1.02 versus 0.68–0.78 mm) and fewer branches measuring 0.80–1.10 mm in diameter, an axial tube metazooecia between the apertures (8–16 versus 16–24). 0.11–0.15 mm in diameter, and apertures 0.07–0.09 mm wide. Stratigraphic and geographic range.—Picos de Europa For− Other aspects of the internal structure are unknown. R. bino− mation, Moscovian, Upper Carboniferous; La Hermida, Spain. dosum McKinney, 1972 from the Bangor Formation (Chester, Lower Carboniferous) of the USA has the same arrangement Subgenus Streblotrypa (Streblascopora) Bassler, 1929 of macro− and microacanthostyles, 0.6–0.9 mm branch diame−

Type species: Streblotrypa fasciculata Bassler 1929 , by original desigter, and long superior and inferior hemisepta. nation; Upper Permian, Indonesia. Stratigraphic and geographic range.—Picos de Europa For− Diagnosis.—Ramose colonies. Clearly defined bundle of axmation, Moscovian, Upper Carboniferous; La Hermida, ial zooecia in the endozone. Diaphragms rare. Hemisepta rare Spain. Probably also Auernig Formation, bed “l”, Upper Car− or absent. Metazooecia present between the autozooecial apboniferous (Gzhelian); Italy, Carnic Alps. ertures (translated after Gorjunova 1985). +

Discussion.—The subgenus Streblotrypa (Streblascopora) Bassler, 1929 differs from the subgenus S. ( Streblotrypa ) Vine, 1885 by having a distinct axial bundle with usually more than 10 axial zooids, and rare and poorly developed hemisepta.

Stratigraphic and geographic range.—Carboniferous to Permian; worldwide.