PLATE 1. Articulated specimens of Jagtithyris suessi (Bosquet, 1859) comb. nov., the type genus of the family Jagtithyrididae Simon & Mottequin, fam. nov., collected from strata dated as late Maastrichtian (Maastricht Formation, Belemnitella junior Zone) in the Maastricht area, southern Limburg, The Netherlands. Fig 1. Neotype, NHMM 2017 013. 1a: Dorsal view showing trapezoidal large foramen, disjunct deltidial plates and smooth valve surface, except for growth lines placed mainly near anterior commissure. 1b: Detailed view of foramen with long, dorsally protruding, narrow disjunct deltidial plates; concave furrow on palintrope clearly visible. 1c: Detailed view of shell surface near commissure with eroded zone revealing punctae. 1d: Ventral view showing costate surface of ventral valve. 1e: Lateral view showing ventribiconvex shell outline, beak ridge and straight lateral commissure. 1f: Anterior view. Anterior commissure rectimarginate to slightly sulcate. 1g: Posterior view of articulated shell. Fig 2. Specimen NHMM 2017 014. 2a: Dorsal view. Growth lines more numerous and most of them developed near commissure. 2b: Ventral view with longitudinal weak costae typical of ventral valve surface. 2c: Lateral view showing ventribiconvex profile, beak ridge and straight lateral commissure. Fig 3. Specimen NHMM 2017 015. 3a: Dorsal view. This specimen has more growth lines developed on entire shell surface. 3b: detailed view of punctae. 3c: Ventral view, with worn costate surface. 3d: Lateral view. This is the case where the lateral commissure is slightly concave ventrally. This specimen is also slightly more biconvex. The permesothyrid foramen is clearly visible in 3a.