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 Dyscritella felixi n. sp. Figures 6 F-H, 7A-B; Appendix zoobank.org/ B5FFF8E9-7B9E-4132-8C26-2AF97A7F089B Etymology. The species is named after Felix, son of Barbara Seuss. Holotype . SNSB-BSPG 2020 XCI 101. Paratypes . Thin sections: SNSB-BSPG 2020 XCI 86, SNSB-BSPG 2020 XCI 87, SNSB-BSPG 2020 XCI 88, SNSB-BSPG 2020 XCI 89. Type locality. TXV-200 (“Spillway section at Lost Creek Lake”), Texas , USA . Type stratum. Graham Formation, Pennsylvanian (Virgilian). Diagnosis. Thin encrusting colonies; 5–7 acanthostyles and 1–4 exilazooecia surrounding each autozooecial aperture; maculae absent. Description. Encrusting colony, 0.40–0.50 mm in thickness. Autozooecial chambers tubular, growing from a thin epitheca. Acanthostyles common to abundant, 5–7 surrounding each autozooecial aperture, originating from base of exozone, moderate to large in size. Diaphragms absent. Exilazooecia small to moderate in size, rounded-angular, 1–4 surrounding each autozooecial aperture. Autozooecial walls granular, 0.008 –0.013 mm thick in endozone; thick, merged, laminated without distinct zooecial boundaries, 0.033 –0.055 mm thick in exozone. Maculae absent. FIGURE 7. Dyscritella felixi n. sp. (A–B): longitudinal thin section of a colony encrusting a brachiopod spine (paratype XCI 87). Rhombopora lepidodendroides Meek, 1872 (C–H): C – branch fragment (XCI 102); D, F – colony surface with autozooecial apertures, acanthostyles and aktinotostyles (XCI 102); E – colony surface with autozooecial apertures, acanthostyles and aktinotostyles (XCI 103); G, H – tangential thin section showing autozooecial apertures, acanthostyles and aktinotostyles (XCI 80b). Remarks. Dyscritella felixi n. sp. is similar to D. inaequalis Girty, 1911 , from the Fayetteville Shale (Mississippian) of Arkansas. The latter species developed ramose colony instead of encrusting ones as in the present species. Furthermore, it has smaller autozooecial apertures. Girty (1911 , p. 194) measured 0.14 mm as the maximum size of the autozooecial apertures for his species in contrast to 0.15–0.24 mm in the studied material. Dyscritella felixi n. sp. differs from D. incrustans Dunaeva, 1964 , from the Carboniferous (Serpukhovian-Bashkirian) of the Ukraine in possessing larger autozooecial apertures (aperture width. 0.15–0.24 mm vs. 0.12–0.15 mm in D. incrustans ).