Goniocladia grahamensis Moore, 1929

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 : 11

Goniocladia grahamensis Moore, 1929

Figure 6 C-E; Appendix

1929 Goniocladia grahamensis Moore , p.

154-156, pl. 18, figs. 1-3, 8-11.

Material. SNSB-BSPG 2020 XCI 100.

Description. Reticulate colonies consisting of anastomosing bifoliate branches. Branches 0.54– 0.70 mm wide. Fenestrules oval to polygonal, 1.00– 1.36 mm wide and 2.32–2.66 mm long. Autozooecia budding in 2–3 rows from each side of thin mesotheca, opening on both sides of the sharp median carina. Lunaria present, horseshoe-shaped, directed toward fenestrule. Numerous microstylets on the colony surface, 0.008 –0.011 mm in diameter.

Remarks. Goniocladia grahamensis Moore, 1929 , differs from G. subpulchra Schulga-Nesterenko, 1955 , from the Gzhelian of the Russian Platform, and from G. tenuis Schulga-Nesterenko, 1933 , from the Gzhelian of Russia, in having smaller fenestrules (fenestrule width 1.00– 1.36 mm vs. 1.25–2.00 in G. subpulchra and 1.75–2.00 mm in G. tenuis ; fenestrule length 2.32–2.66 mm vs. 3.25–4.25 mm in G. subpulchra and 3.15–4.70 mm in G. tenuis ).

Occurrence. Upper Graham Formation, Pennsylvanian (Virgilian); Texas, USA. Graham Formation, Pennsylvanian (Virgilian); TXV-200 (“Spillway section at Lost Creek Lake”), Texas, USA.

Figures

FIGURE 6. Cystodictya formosa Moore, 1929 (A–B): A – deep tangential section showing autozooecial chambers with hemisepta and vesicular skeleton (XCI 27); B – branch transverse section showing mesotheca, autozooecial chambers and vesicles (XCI 23c). Goniocladia grahamensis Moore, 1929 (C–E): branch fragment showing the shape of fenestrule, ridges on branches and autozooecial apertures with lunaria (XCI 100). Dyscritella felixi n. sp. (F–H): F – colony encrusting a brachiopod spine (holotype XCI 101); G – colony surface showing autozooecial apertures, exilazooecia, and acanthostyles; H – tangential thin section showing autozooecial apertures, exilazooecia, and acanthostyles (paratype XCI 86).