Eurygnathodus, Staesche 1964

Leu, Marc, Bucher, Hugo, Vennemann, Torsten, Bagherpour, Borhan, Ji, Cheng, Brosse, Morgane & Goudemand, Nicolas, 2022, A Unitary Association-based conodont biozonation of the Smithian-Spathian boundary (Early Triassic) and associated biotic crisis from South China, Swiss Journal of Palaeontology (19) 141 (1), pp. 1-61 : 52

Genus EURYGNATHODUS Staesche 1964 .

Type species. Eurygnathodus costatus Staesche, 1964 Type stratum and locality. Campiller member, Skyth, South Tirol, Italy .

Description. Scaphate P 1 element bearing a variably broad, oval-shaped platform with or without transverse ribs. So far, the multi-element apparatus of Eurygnathodus is unknown.

Remarks. Recent discussions for the definition of the Global Stratotype Section and Point ( GSSP) for the Induan–Olenekian Boundary ( IOB) emphasize that this easily identifiable and cosmopolitan genus may be a useful index for the base of the Olenekian. Yet, its phylogenetic origin is still unclear, leaving opened the question of whether its seemingly sudden appearance in equatorial and tropical localities close to the IOB may reflect an ecological signal.