Stenolaemate bryozoans from the Graham Formation, Pennsylvanian (Virgilian) at Lost Creek Lake, Texas, USA Author Ernst, Andrej Author Claussen, Anna Lene Author Seuss, Barbara Author Wyse Jackson, Patrick N. text Palaeontologia Electronica 2022 a 15 2022-05-31 25 2 1 56 http://dx.doi.org/10.26879/1174 journal article 294467 10.26879/1174 77c06bea-bbd5-46af-8ef1-f434aa25c6a8 1094-8074 11032471 A4A07D50-3DDB-4E45-A255-1ECCF45F147A Rhombocladia delicata Rogers, 1900 Figures 8 H-I, 9A-B; Appendix 1900 Rhombocladia delicata Rogers , p. 12, pl. 1, figs. 1-1d. pars 1906 Rhombocladia delicata Rogers, 1900 ; Johnsen, p. 58, pl. 11, fig. 30a [? non 30b]. pars 1929 Rhombocladia delicata Rogers, 1900 ; Moore, p. 149, pl. 17, figs. 26-28, 30, 31 [non 29, 32]. 1930 Rhombocladia delicata Rogers, 1900 ; Warthin, p. 42, pl. 3, fig. 17. 1963 Rhombocladia delicata Rogers form A; Ceretti, p. 327, pl. 7, fig. 10. 1964 Rhombocladia delicata Rogers ; Ceretti, p. 184, 185, pl. 33, fig. 2a, b, 4a, b. 2003 Rhombocladia delicata Rogers, 1900 ; Ernst, p. 63, 64, pl. 5, figs. 4-7; text-fig. 3. 2016 Rhombocladia delicata Rogers, 1900 ; Ernst et al., p. 530, figs. 6b-f, 8a, d, 9a. 2021 Rhombocladia delicata Rogers, 1900 ; Ernst, Krainer, and Lucas, p. 228, figs. 7d-h. Material. SNSB-BSPG 2020 XCI 22a-c, SNSB-BSPG 2020 XCI 105. Description. Ramose colonies, branches 0.74– 1.07 mm wide, 0.40-0.50 mm deep, flattened, bearing 5–6 zooecial rows; dorsal wall rugose. Diaphragms not observed. Superior hemisepta present. Oval apertures arranged in a diagonal pattern. Autozooecial chambers rhombic in mid-tangential section. Single macroacanthostyle at the distal end of each autozooecial aperture present. Microacanthostyles arranged in few irregular rows between autozooecial apertures, 0.008 –0.013 mm in diameter. Leptozooecia not observed in present material. Autozooecial walls in endozone 0.015 –0.020 mm thick, hyaline; finely laminated in exozone. FIGURE 9. Rhombocladia delicata Rogers, 1900 : (A) – transversal thin section (XCI 22c), (B) – branch longitudinal thin section (XCI 22b). Chainodictyon minor Ulrich, 1890 , (C–G): C – branch fragment and colony surface showing autozooecial apertures (XCI 106); D – branch reverse side showing transversal striation (XCI 125); E–G – tangential thin section showing fenestrules, autozooecial apertures and chambers, and a leptozooecium (arrow) (XCI 37). Remarks. Rhombocladia delicata Rogers, 1900 , differs from R. coronata Schulga-Nesterenko, 1955 , from the Moscovian of Russian Platform by presence of macroacanthostyles. It differs from R. carnica Ceretti, 1964 , from the Pennsylvanian (lower Gzhelian) of Italy by having wider branches ( 0.74–1.07 mm vs. 0.63–0.96 mm ). Occurrence. Carboniferous, Pennsylvanian; Kansas , USA . Carboniferous, Middle Pennsylvanian (Wewoka Formation); Oklahoma , USA . Carboniferous, Pennsylvanian, Corona Formation (early Gzhelian); Kron Alpe (Monte Corona), Carnic Alps ( Austria ). Carboniferous, Pennsylvanian, Auernig Formation (Lower Gzhelian); Auernig, Carnic Alps (Udine, Italy ). Strata probably attributable to the Las Llacerias Formation, Pennsylvanian (Kasimovian); Cantabrian Mountains, Asturias, NW Spain. Carboniferous, Pennsylvanian, Missourian (Kasimovian), Deese Group, Boggy Formation; Buckhorn Asphalt Quarry near Sulphur, Oklahoma , USA . Gray Mesa Formation, Pennsylvanian (Desmoinesian); Fra Cristobal Mountains, New Mexico , USA . Graham Formation, Pennsylvanian (Virgilian); TXV-200 (“Spillway section at Lost Creek Lake”), Texas , USA .