FIGURE 1. Lithostratigraphical column of Oxfordian strata in the Kraków area (southern Poland), with indication of the Szklarka valley locality (modified after Matyszkiewicz, 1996; Matyszkiewicz et al., 2012).
FIGURE 2. Sedimentology, palaeoecology, and presence of decapod crustaceans in the Szklarka valley outcrop (see Figure 1 after Müller et al., 2000; supplemented by Fraaije et al., 2022). The black star denotes the approximate level of provenance of the holotype of Palaeosynaxes montserratae nov. gen., nov. sp. (Figure 4).
FIGURE 3. Distribution of synaxid achelatans over geological time, from the Late Jurassic to the present day. A, Extant Palinurellus gundlachi von Martens, 1878. B, Extant Palinurellus wienecki (De Man, 1881). C, Extant Palibythus magnificus Davie, 1990. D, Late Eocene Palinurellus bericus De Angeli and Garassino, 2014. E, Late Cretaceous (Cenomanian) Palaeopalinurellus jbeilensis Garassino and Pasini, 2020. F, Late Jurassic (Tithonian) Palaeopalinurellus strambergensis (Bachmayer, 1959). G, Late Jurassic (Oxfordian) Palaeopalinurellus culocervus Fraaije, Van Bakel, Jagt, and Brochet, 2020.
FIGURE 4. Palaeosynaxes montserratae nov. gen., nov. sp., holotype (MAB k3781), in left lateral and dorsal views, scale bar equals 5 mm.
FIGURE 5. Palinuroid evolutionary scenario proposed herein, combining data from Holthuis (1991), Haug et al. (2009), and present observations of Palaeosynaxes montserratae nov. gen., nov. sp.
