Kvacek, Teodoridis & Kvaček & Radoň & Raprich & Bruch, 2020, Teodoridis & Kvaček & Radoň & Raprich & Bruch, 2020

Teodoridis, Vasilis, Kvaček, Zlatko, Radoň, Miroslav, Raprich, Vladislav & Bruch, Angela A., 2020, A New Oligocene Flora From Ludvíkovice Near Děčín (České Středohoří Mts., The Czech Republic), Fossil Imprint 76 (2), pp. 297-314 : 302

Eotrigonobalanus furcinervis (ROSSM.) H.WALTHER et KVAČEK in Kvaček and Walter 1989

Pl. 2, Figs 6–8

1840 Phyllites furcinervis ROSSM. , p. 33, pl. 6, fig. 25, pl. 7, figs 26–31.

1989 Eotrigonobalanus furcinervis (ROSSM.) H.WALTHER et KVAČEK in Kvaček and Walther, p. 581, text-figs 3–10, pls 33–36, 38–46, pl. 47, figs 1–3.

M a t e r i a l. Incomplete simple leaves, impressions PA

1645, PA 1661.

D e s c r i p t i o n. Leaves simple, incomplete, oblong to elliptic, 70 mm and 102 mm long, 22 mm and 24 mm wide, base cuneate without petiole, apex not preserved probably shortly attenuate to acute, margin entire, venation eucamptodromous, midrib thick, almost straight, secondary veins thinner, slightly bent and looping along the margin, regularly spaced, alternate to subopposite, originating at 40°, tertiary veins percurrent, venation of the higher orders regular polygonal reticulate, areolation well-developed, 3 to 4 sided.

R e m a r k s. The leaves morphologically clearly match Eotrigonobalanus furcinervis , but the identification is tentative due to the lack of leaf epidermal anatomy. The leaves of this extinct fagaceous element are common in the late Eocene fluviatile sandstones of the Staré Sedlo Fm. ( Knobloch et al. 1996, Teodoridis et al. 2012), Kučlín ( Kvaček 2002 , 2010, Kvaček and Teodoridis 2011) and other sites of this kind in Germany and elsewhere in Europe ( Kvaček and Walther 1989). The occurrence of Eotrigonobalanus in Seifhennersdorf ( Walther and Kvaček 2007 ) is the oldest evidence of this genus in volcanic floras of Central Europe during the early Oligocene. Regionally, this element is also known from the late Oligocene at Kleinsaubernitz ( Walther 1999).