Streblotrypa multipora

Description. Ramose colonies, branches 0.43 – 0.76 mm in diameter, with 0.19 – 0.38 mm wide endozones and 0.10 – 0.20 mm wide exozones. Branch transverse sections rounded to oval. Autozooecia budding from the axial bundle in a regular spiral pattern at angles of 18 – 28 °, bending in exozones and intersecting colony surface at angles of 60 – 80 °, having long inflated proximal parts, rounded-polygonal in transverse section in the endozone. Axial bundle indistinct, formed by 2 – 5 axial zooecia, 0.11 – 0.15 mm in diameter. Autozooecial apertures oval, opening around the branches in regular diagonal rows. Autozooecial boundaries marked by sharp ridges on the colony surface, which form a roughly hexagonal pattern. Superior hemisepta absent; inferior hemisepta well-developed, thin, placed approximately in the middle of the chamber, curved proximally. Autozooecial diaphragms rarely occurring. Metazooecia oval to rounded, usually 7 – 10 arranged in 2 – 3 rows between apertures, but often clustered in parts of branches lacking apertures. Autozooecial walls hyaline, 0.010 – 0.015 mm thick in endozone; laminated in exozone.

Figure 8 D-G; Appendix

Remarks. Streblotrypa (Streblotrypa) multipora Warthin, 1930, differs from S. (S.) merceri Morningstar, 1922, from the Pennsylvanian of Ohio by presence of 7 – 10 metazooecia between autozooecial apertures instead of four in the latter species. Streblotrypa (Streblotrypa) multipora differs from S. (S.) heltzelae Ernst et al., 2016, from the Boggy Formation of Oklahoma by its absence of acanthostyles. Occurrence. Upper Wetumka – lower Wewoka Formation, Pennsylvanian (Desmoinesian), Oklahoma, USA. Graham Formation, Pennsylvanian (Virgilian); TXV- 200 (“ Spillway section at Lost Creek Lake ”), Texas, USA.

Material. SNSB-BSPG 2020 XCI 39 b, SNSB-BSPG 2020 XCI 40, SNSB-BSPG 2020 XCI 41, SNSB-BSPG 2020 XCI 43, SNSB-BSPG 2020 XCI 104.