Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 74. (Budapest 1982)

Szabó, J.: Lower and Middle Jurassic Gastropods from the Bakony Mountains (Hungary). Part IV.: Neritacea, Craspedostomatacea, Amberleyacea (Archaeogastropoda)

Remarks : These forms are similar to those of Neritopsis fabianii, which have transverse ridges or riblets, but differ in having stronger and longer costae restricted to a longer and definite shell portion. Moreover, N.papodensis sp. n. has a higher spire and a deeper suture than N. fabianii TONI has. N. elegantissima HÖRN, and the related species with costae or varices differ in having over the full length of the teleoconch. Neritopsis (Neritopsis) spinigera sp. n. (Plate I: figs. 10-18) Holotype : Plate I: figs. 10-11; Locus typicus : Bakonybél, Somhegy; Stratum t y p i c u m horizontal fissure-filling limestone ; Derivatio nominis: spinigera (Lat.) = thorny. Diagnosis : smooth, low turbiniform protoconch; a broad ramp on the whorls, delmited by carinate angulation; ornament of longitudinal cords crossed by strong, regularly repeated varices; long, hollow spines at the intersections of the angulation and the varices, each with a parabolic growth-line. Measurements: H HL HA W D A Plate 1: figs. 10-11 13 11 11 18 Material : Each of the 31 specimens is more or less damaged. Shape : Shell dextral, subglobose, with bicarinate whorls. Below the suture, a broad, flattened ramp extends, delimited by a rounded angulation marked by the upper, stronger keel. Peristome is Fig. 1. Stratigraphie distribution of the species in the Bakony Mts. 1 = Neritopsis (N,) elegantissima, 2 — Neritopsis (N.) fabianii, 3 = Neritopsis (N,) papodensis, 4 = Neritopsis (N.) spinigera, 5 = Neritoma (Neridomus) aff. tethys, 6 = Neritoma (Neridomus) sp., 7 = Crossostoma sp., 8 = Crossostoma ? cf perampla, 9 = Chartronella noszkyi, 10 = Boeckhia boeckhi, 11 Amberleya (E.) alpina, 12 = — Amperleya (E.) capitanea, 13 = Amberleya (E.) aff. carpathica 14 = Risselloidea multistriata, 15 = Eucyclomphalus cupido, 16 = Eucyclomphalus aff. campiliensis, 17 = Trochacanthus ? disputabilis