.i.Omphalophloios wagneri./i. sp. nov., a new sub-arborescent lycopsid from the middle Moscovian (Middle Pennsylvansian) of the Illinois Basin, USA

0518188 - GLÚ 2020 RIV NL eng J - Článek v odborném periodiku
Opluštil, S. - Pšenička, J. - Bek, Jiří
Omphalophloios wagneri sp. nov., a new sub-arborescent lycopsid from the middle Moscovian (Middle Pennsylvansian) of the Illinois Basin, USA.
Review of Palaeobotany and Palynology. Roč. 271, December (2019), č. článku 104105. ISSN 0034-6667. E-ISSN 1879-0615
Institucionální podpora: RVO:67985831
Klíčová slova: Omphalophloios wagneri * Sporangiostrobus * In situ spores * Illinois Basin * Pennsylvanian
Obor OECD: Paleontology
Impakt faktor: 1.425, rok: 2019
Způsob publikování: Omezený přístup
https://www.sciencedirect.com/science/article/pii/S0034666719300314?via%3Dihub

Described is a new species of sub-arborescent lycopsid, Omphalophloios wagneri sp. nov. from roof shale of the middle Moscovian (Bolsovian/Atokan) (Middle Pennsylvanian) Lower Block Coal in the Illinois Basin, Indiana, USA. Available material represents mostly fragments of 16 to > 60 mm wide fertile axes that bear densely spaced sporangia, which are flattened due to compaction into disc-like shape, 2.5–3.1 mm in diameter. The outer sporangial cell wall layer displays a gradual transition from isometric cells in the central parts of adaxial and abaxial sporangial valves, to a narrow belt of elongated cells in the equatorial area, interpreted as a dehiscence zone. Micro- and megasporangia alternate in irregular patches, a single sporangium being attached adaxially to an extended sporophyll base. Cyperites-like sporophyll distal laminae are ~ 25 mm long at fertile shoot apices but become progressively longer (> 110 mm) down the shoots. Based on size distribution of stems, fertile shoots are estimated to bifurcate at least five times, which suggests that O. wagneri formed a relatively dense crown. The entire habit of the plant is difficult to assess from existing material, however, the tree was probably small and interpreted as colonizing low lying to slightly raised peat swamps. Omphalophloios wagneri differs from all other adpression-based species of the genus in having the smallest sporangia and several orders of fertile-axis bifurcations. In situ megaspores of the Zonalesporites brassertii type also are different from all other Omphalophloios megaspores.
Trvalý link: http://hdl.handle.net/11104/0305014