Diplopodichnus biformis Brady, 1947

Moreau, Jean-David & Gand, Georges, 2022, New data on the Permian ecosystem of the Rodez Basin: ichnofauna (traces of protostomians, tetrapods and fishes), jellyfishes and plants from Banassac-Canilhac (Lozère, southern France), Geodiversitas 44 (31), pp. 975-987 : 978

Diplopodichnus biformis Brady, 1947 ( Fig. 3C, D )

MATERIAL EXAMINED. — Seven traces; four traces preserved as convex hyporeliefs on slab M486_ 2022.1.1 ; three traces preserved as convex hyporeliefs on slab M486_ 2022.1.2 .

DESCRIPTION

Traces are horizontal, unbranched, straight to curved, run in different directions and up to 3.0 mm wide. The longest course is 72 mm. The traces consist of two thin and up to 1.4 mm wide parallel hypichnial ridges separated by a central groove that is up to 0.8 mm wide ( Fig. 3C, D ).

REMARKS

The ichnogenus Diplopodichnus Brady, 1947 is reported from the Late Proterozoic to the Early Jurassic ( Buatois et al. 1998; Uchman et al. 2011 and references therein). D. biformis is widely recorded in Palaeozoic deposits including many occurrences in Permian formations worldwide (e.g. Brady 1947; Lucas et al. 2004, 2005; Contardi & Santi 2009; Avanzini et al. 2011a; Lima & Netto 2012; Moreau et al. 2020).

Figures

FIG. 3. — Jellyfish and protostomian traces:A, B, Medusina atava(Pohlig,1892) Walcott,1898,photograph (A) and interpretative sketch (B),specimen M486_2022.1.9; C, D, Diplopodichnus biformis Brady, 1947 (Di.) and Scoyenia gracilis White, 1929 (Sc.); photograph (C) and interpretative sketch, specimen M486_2022.1.2. Abbreviations: Ma., manubrium; Ra., radial canals; Ve., velum. Scale bars: 1 cm.