Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 75. (Budapest 1983)
Vörös, A.: Some new genera of Brachiopoda from the Mediterranean Jurassic
Description : External characters (Representative figures of the type species: BENIGNI 1978, pi. 13, fig. 1, 2): At present, Kericserella contains only its type species. It is small (generally not exceeding 10 mm) rounded subtrigonal in outline. The brachial valve is strongly convex posteriorly and becomes flattened anteriorly. The pedicle valve is evenly convex. A shallow and wide dorsal sulcus is developed on the anterior part. After a short posterior smooth stage, 5-10 strong, rounded costae develop. The long and flat planareas are well demarcated by strong beak ridges in both valves. The lateral commissures are straight, running in the middle of the planareas. The anterior commissure is gently sulcate and shows strong zig-zag deflections. The beak is small and erect. Internal characters (Fig. 4) —• Pedicle valve: The delthyrial cavity is quadrate with two ventral grooves just beside the base of the dental plates; the umbonal cavities are subtrigonal in cross section. The dental plates are parallel, extending a little beyond the plane of articulation. The presence of a pedicle collar is questionable. (BENIGNI 1978, p. 134, fig. 2, figured a well-developed pedicle collar in serial sections made from K. inversaeformis but a similar structure was not observed in the specimen studied here.) The hinge-teeth are short and stout; the denticula are massive, blunt. — Brachial valve (Fig. 11): The cardinal process is not well-defined but the pointed posterior end of this valve projects slightly into the delthyrial cavity. (This cannot be interpreted otherwise than the place of attachment for diductor muscles since there is no trace of muscle trough or any other attachment surface posterior to the plane of articulation.) There is no median septum. Hinge plates are missing; the crural bases are given off dorsally from the elevated inner socket ridges. The crura are reminiscent of the falcifer type in lateral view, however in cross-section they are not concave but convex toward each other. Discussion : The type species K. inversaeformis has generally been assigned to the genus Pisirhynchia by the recent authors (e.g. BENIGNI 1978) because of its sulcate appearance. Some external features (strong beak ridges and planareas) and the internal peculiarities documented here (lack of hinge plates, falcifer crura) contradict this assignment and necessitate the erection of a new genus. For the above reasons, Kericserella cannot be placed into the Norellidae (with arcuifer crura), in spite of the seemingly analogous sulcation. The attribution of Kericserella to the Basiliolidae is not quite satisfactory, either. This family has falcifer crura and is perhaps variable enough to embrace Kericserella but none of its members can be brought into close relation with our new genus. 5 mm Fig. 4. Kericserella inversaeformis (SCHLOSSER). A series of eight transverse sections through the posterior part of a specimen from Kericser (Bakony, Hungary), Davoei Zone. Hung. Geol. Inst.. J. 9187. Original length of specimen 9.6 mm. The crura persisted to 1.7 mm from the posterior end of the shell.
