Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 73. (Budapest 1981)

Szabó, J.: Lower and Middle Jurassic Gastropods from the Bakony Mountains (Hungary). Part III.: Patellacea and Trochacea (Archaeogastropoda)

ANNALES HISTORICO-NATURALES MUSEI NATIONALIS HUNGARICÏ Tomus 73. Budapest, 1981 p. 55-67. Lower and Middle Jurassic Gastropods from the Bakony Mountains (Hungary) Part III. Patellacea and Trochacea (Archaeogastropoda) by J. SZABÓ, Budapest Abstract — Nine of the here described eighteen species are new : eight from the Bajocian and one from the Pliensbachian

; two, perhaps endemic genera are also defined: Proconulus epuloides sp. n., P. epuliformis sp. n., P. rimosus sp. n., Dimorphotectus unicarinatus sp. n., D. bicarinatus sp. n., Trochopsidea kondai sp. n., Zircia zircensis gen. & sp. n. (Ataphridae), Adeorbisina procera sp. n. and Bakonyia planapex gen. & sp. n. (Turbinidae, Colloniinae). With 1 figure and 2 photoplates. Suborder PATELLINA VON IHERING, 1876 Superfamily Patellacea RAFINESQUE, 1815 Family Acmaeidae CARPENTER, 1857 Genus PSEUDORHYTIDOPILUS Cox, 1960 Pseudorhytidopilus sp. (Plate I: fig. 1.) Measurements: H L W Plate I: fig. 1 19.5 — Material : — A small juvenile, and a larger fragmentary specimen. Shape — Conical, with slightly ovate peristome. The height and length of the shell are approximately equal. The apex is excentric, shifting anteriorly (?), more exactly: toward the top of the peristome. The shell outline is convex near the apex only in lateral wiew. Ornament — Above the growth lines, ornamental elements are not observable. Embryonal shape and ornament — The nucleus is subglobose, followed by shell part with convex sides. The ornament is similar to the corresponding parts in the adult. Remarks — Cox (in MOORE 1960), defined Pseudorhytidopilus as a genus without radial ornament ranging it in a family of uncertain systematic position perhaps belonging to Pulmonata, too. However, the one-sentence definition of this genus indicates an insufficient basis of this ranging: "Like Rhytidopilus, but lacking anterior elevate sector" (p. 237), i.e. lacks the only definite feature, which would prove its non-patellacean position. Consequently, the Pseudorhytidopilus might rather belong to Acmaeidae. In this case, its relationship to the genus Acmaea needs a clearing up, since they might well be synonyms. Owing to the bad preservation, the species state of this form is doubtful. Distribution — Bakony Mts: Somhegy, Humphriesianum Zone; Gyenespuszta (near to Hárskút). ? Upper Bajocian Suborder TROCHINA Cox & KNIGHT, 1960 Superfamily Trochacea RAFINESQUE, 1815 Family Trochidae RAFINESQUE, 1815 Subfamily Proconulinae Cox, 1960 Annls hist.-nat. Mus. natu, hung., 73, 1981