Raminervia Boyarina, 1994

Boyarina, Natalya, 2010, Late Gzhelian pteridosperms with callipterid foliage of the Donets Basin, Ukraine, Acta Palaeontologica Polonica 55 (2), pp. 343-359 : 352

Genus Raminervia Boyarina, 1994 emend. nov.

Type species: Raminervia mariopteroides Boyarina, 1994 . Upper Gzhelian , Donets Basin, Ukraine .

Emended diagnosis.—Frond bipartite with bifurcated primary rachis in the upper part, bipinnate, with intercalary laminate elements between pinnae. Penultimate order axes in the apical part terminating in a pseudodichotomy. Pinnules wedge−shaped, round−lobed with a contracted base. Midvein pronounced to the middle of the pinnule.

Remarks.—The genus Raminervia Boyarina, 1994 with a single species Raminervia mariopteroides , was originally established as the natural genus to include the callipterid foliage and the fertile pinnules with the seed scars ( Boyarina 1994). Previously the rings on the pinnules ( Fig. 8G 2 ) were interpreted as the seed scars on the fertile pinnules, but now they are considered to be traces of insect activity as suggested by Hans Kerp (written communication 2009). Therefore, the genus Raminervia is now reinterpreted as a morphogenus.

Figures

Fig. 2. Stratigraphic position, lithological successions, depositional environments interpretations and plant assemblages of the plant−bearing strata in the locality Luganskoye. ISS, International Stratigraphic Scale