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

Remarks— This form is distinguished from Anoptychia hastata sp. n., the other high-spired species in the fauna by its greater spiral angle, different proportions and lack of ornament. The badly preserved specimen which had two serious damages in its life, can be hardly determined specifically, and the generic arrangement is somewhat uncertain, because of the lack of the juvenile part of the shell. Genus OONIA GEMMELLARO. 1878 Oonia pennina (PARONA, 1892) (Plate III. fig. 9) 1880: Chemnitzia sp. — PARONA, p 210, pi. 3, fig. 10. 1892: Pseudomelania pennina n. sp. — PARONA, p. 12. pl. 1, fig. 1-2. 1967: Anoptychia dubia (Terquem) — SACCHI-VIALLI and CANTALUPPI. p. 119. pi. 18, figs 3a-b. Measurements: H HL HA D W A Plate III: fig. 9. — 28 19 22 — 45-35° Material — A single specimen with shell of many damages. Shape — Dextral form with moderately high spire, slightly convex outline, similarly slightly convex whorls. Below the suture runs a thick spiral fold, separated from other parts of the whorlsurface by a shallow concave zone. The base is convex, without umbilicus. Ornament — The whorls are ornamented spirally with fine striation visible only by magnification. The shell becomes gradually smooth from the suture toward the periphery, then the striation reappears along the inner lip. The fine growth lines are slightly opisthocyrt. Distribution — Southern Alps, Gozzano: Middle Liassic; Bakony. Kericser: Stokesi Zone. Remarks — There are no marked differences between the Bakony specimens and that figured by PARONA, and the somewhat smaller spiral angle on the specimen of SACCHIVIALLI and CANTALUPPI cannot be regarded as significant difference. These latter authors revised the descriptions of PARONA, and wrongly identified O. pennina as the species „Anoptychia" dubia (TERQUEM, 1865). Apart from the markedly different proportions, the species of TERQUEM lacks the spiral fold below the suture, its whorls are more convex, the suture is deeper, and the peristome shows a significant siphonal extension, which is missing completely in O. pennina. Moreover, in spite of the lack of the juvenile shell, which is ribbed in Anoptychia. certainly the species cannot be ranged into genus Anoptychia. The height of the last whorl exceeds well half of the probable total heigh, which is an Oonia character, but, in turn, in Anoptychia it rarely exceeds slightly a quarter. This very proportional feature served as a basis for ranging this species here into the genus Oonia, instead of Pseudomelania. The above-discussed value is about 1 /3 in this latter genus. The most similar form is Oonia dresnayi BOURROUILH, 1966, but its spiral angle is greater by ca. 10°, and its subsutural fold is markedly weaker. Superfamily Xenophoracea DESHAYES. 1864 Family Lamelliphoridae KOROBKOV, 1955 Genus LAMELLIPHORUS COSSMANN, 1915 Lamelliphorus rhombifer (UHLIG, 1881) (Plate I: figs 14-15) 1881 : Trochus (Carinidea) rhombifer n. f. — UHLIG. p. 405. pi. 7. figs. 15-16. Measurements: H HL HA D W A Plate I: fig. 14. — 9 6 15 — 45-54 Material — Four fragmentary specimens with shell. Shape — Dextral form with moderately high and coeloconoid spire. The whorl-surface is sigmoidal. with a carina running on the lower margin, and the periphery is carinated. too. The base is concave in the peripheral zone, then, after a convexity, it rounds toward the columella. The peristome is strongly prosocline. roughly quadrangular, simple, with only a small, flat convexity at the columellar part.