Rhombocladia delicata Rogers, 1900

Ernst, Andrej, Claussen, Anna Lene, Seuss, Barbara & Wyse Jackson, Patrick N., 2022, Stenolaemate bryozoans from the Graham Formation, Pennsylvanian (Virgilian) at Lost Creek Lake, Texas, USA, Palaeontologia Electronica (a 15) 25 (2), pp. 1-56 : 16-18

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.

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.

Figures

FIGURE 8. Rhombopora lepidodendroides Meek, 1872 (A–C): A – branch transverse section (XCI 58a); B, C – branch longitudinal section showing autozooecial chambers and aktinotostyles in autozooecial wall (XCI 45b). Streblotrypa (Streblotrypa) multipora Warthin, 1930 (D–G): D, E – branch fragment showing autozooecial apertures and metazooecia (XCI 104); F – branch transverse section showing autozooecial chambers and axial bundle (XCI 39b); G – branch longitudinal section showing branch transverse section showing autozooecial chambers with hemisepta (arrows) and axial bundle (XCI 40). Rhombocladia delicata Rogers, 1900 (XCI 105) (H–I) – branch fragment (H) and colony surface showing autozooecial apertures, acanthostyles and paurostyles (I).