Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 75. (Budapest 1983)
Szabó, J.: Lower and Middle Jurassic Gastropods from the Bakony Mountains (Hungary). Part V.: Supplement to Archaeogastropoda; Caenogastropoda
ANNALES HISTORICO-NATURALES MUSEI NATIONALIS HUNGARICJ Tomus 75. Budapest, 1983 p.27-46. Lower and Middle Jurassic Gastropods from the Bakony Mountains (Hungary) Part V. Supplement to Archaeogastropoda; Caenogastropoda by J. SZABÓ, Budapest Abstract — Eight Bajocian species of the here described 21 Liassic and Middle Jurassic gastropod species are new to science, one of these belongs to the here designated new genus Maturifusus as type species: M. densicostatus gen. et sp. n. Other new species are: Ventricalia? vesicula sp. n., Anoptychia hastata sp. n., Cerithinella rigauxoides sp. n., Procerithium (Cosmocerithium )? angulocostatum sp. n., Pietteia trispinigera sp. n., Eucycloidea galaczisp. n. and Ochetochilus piceits sp. n. With 2 figures and 3 photoplates. Supplement to Order Archaeogastropoda After the publication of the first parts of the series on the Jurassic gastropod faunas of the Bakony Mts., new collections and preparation works resulted in specimens which belong to new, or previously fragmentarily known, unidentifiable species. Here follow the supplementary descriptions of the newly recognized species. Suborder 7MACLURITINA Cox et KNIGHT, 1960 Superfamily lEuomphalacea DE KÖNINCK, 1881 Family ?Helicotomidae WENZ, 1938 Genus IPARA VI VIAN A KUTASSY, 1940 Paraviviana? sp. (Plate I: figs. 1-3) Material — Fragment of a single specimen. Shape — The partially preserved three whorls show the conical shell with nearly gradate outline. Below the suture runs a narrow, somewhat concave ramp, with a break in the whorl-surface on the abaxial margin. This angulation is accentuated by the uppermost and strongest of the three carinae on the narrow peripheral zone. The suture of the earlier whorls runs on the middle carina. The lower carina is visible only on the last whorl, accentuating the angular periphery, too. The convex base encircles a very wide umbilicus, which is bordered also by a carinated angulation. Ornament — Beyond the mentioned carinae, the whole shell is covered by dense, uniform, spiral striation, forming the spiral ornament. The transverse ornamentation is formed by tiny rugae, which may appear as rib-like elements. They run parallel to the growth lines, which are generally prosocline, but occasionally somewhat opisthocyrt on the ramp and on the base. The intersections of the carinae and the transverse rugae bear tubercles. Distribution — Bakonybél. Somhegy: condensed Subfurcatum-Garantiana Zones. Remarks — The described fragment matches the description of Paraviviana, but incompletely, because of the missing juvenile shell. If the juvenile shell was conical too, this would refer the specimen into Nododelphinulidae Cox, 1960. Among the widely umbilicated Nododelphiiuda species there are some which are similar but those have bicarinate instead of tricarinate periphery, thus rangeing this specimen into genus Paraviviana seems more probable.
