Mojs']jsvaroceras gianii n. sp. and related coiled nautiloids from the Middle Triassic of Lombardy (Northern Italy)

-The nautiloid genus Mojsvaroceras Hyatt, 1883, is rare and poorly known among the Middle Triassic nautiloids in the Tethyan region. Strikingly, we discovered the novel species Mojsvaroceras gianii n. sp. at Rasa di Varese village in the Rasa dolostone outcrop from the uppermost Anisian, upper Reitzi Zone and Secedensis Zone. Furthermore, we found the species Mojsvaroceras zaki Parnes, 1986 and Mojsvaroceras kummeli Parnes, 1986 in the Esino Limestone of Parina Valley. These two species were previously known only from the Sephardic Province. Here we describe the many shared characteristics of these three species and hypothesise that they may originate from a single stem together with Mojsvaroceras haasi also from the Sephardic Province. The implications for the palaeogeographical occurrences of these forms are also discussed.