Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 72. (Budapest 1980)

Szabó, J.: Lower and Middle Jurassic Gastropods from the Bakony Mountains (Hungary). Part II.: Pleurotomariacea and Fissurellacea (Archaeogastropoda)

Pleurotomaria (Anodomaria) anodosa sp. n. (Plate II: figs. 8-9) Holotypus : Plate II: fig. 8. — Locus typicus: Bakony Mts., Eplény, Manganese-ore mine. — Stratum typicum: Limestone infilling a vertical submarine fissure. — Derivatio nominis: See in the name of the subgenus ; referring to the ornament without nodes. — Diagnosis : Sculpture without nodes, stronger longitudinal ornamental elements and sharp, carinate periphery. Measurement: H HL HA W D A Plate II: fig. 8 40 14 16 31 Material — One juvenile form and an other, only partially visible specimen. Shape — Dextral, moderately high form, with gradate spire. A moderately broad, flattened ramp runs below the suture, bordered by an angulation abaxially, which is carinate in one of the two specimens. Subjacently a broad, flattened band appears, which is nearly parallel to the axis, and becomes somewhat concave on the later whorls. This band is separated from the slightly convex base by a sharp angulation. The selenizone courses somewhat above the middle of the band between the two angulations. Ornament — The surface of the whorls, as well as the base, is covered by spiral cords. Similar cords appear on the selenizone, and on the carinae of the two angulations. The transverse ornament consists of growth-lines. These become denser and rarer, which may result in the appearance of ridges, more or less periodically along the suture. These ridges fade out rapidly away from the suture. Remarks — The carinate specimen of P. (A.) anodosa resembles in shape most closely to Worthenia? superstes sp. n. However, the position of the selenizone distinguishes easily these two forms. This same feature marks out this species from all Bathrotomaria. With its different dimensions and dominantly longitudinal ornament, it is distinguished from P. scacchi of cancellate ornamentation. One of the two specimens shows more distinct ornamentation, but the other is closely similar in its dimensions and arrangement of the sculpture. The species is probably variable in its ornament, but to prove this fact further specimens are needed. Distribution — Bakony Mts., Eplény manganese ore mine: Domerian. Genus LEPTOMARIA E. EUDES-DESLONGCHAMPS, 1864 Leptomaria somhegyensis sp. n. (Plate HI: figs. 1, 2, 3) Holotypus : Plate III: fig. 1. — Locus typicus: Bakony Mts., Bakony bél, Somhegy. — Stratum typicum: Submarine, horizontal fissure-filling limestone. — Derivatio nominis: Referring to the name of the locality. — Diagnosis : High, conical shell with numerous, low whorls, selenizone below the concave mid-whorl and fine, cancellate ornament. Measurements: H HL HA W D A Plate III: fig. 1 12.5 7 — 21.5 45° Material — Six specimens, but owing to the exceptionally thin shell, all were damaged during the preparation. Shape — Dextral, conical shell. The whorl-surface is convex, the moderately wide, concave selenizone is situated below the middle of the whorl. The whorl-section is tetragonal. The periphery is rounded-angular, the base is slightly convex, with wide, open umbilicus. The base curves with a convexity, then with an angulation into the umbilicus. The peristome is unknown. Ornament —• The whole whorl-surface and the base is covered with fine, spiral threads. These are intersected only by growth-lines on the base, while the whorl-surface shows additional parallel transverse threads with interspaces wider than those of the spiral threads. This ornament of two orientations results in a retiform sculpture. Upon the selenizone run one or two spiral threads, which are intersected, just as in the transverse threads, by stronger, periodically repeating lunulae. The course of the growth-lines is prosocline and slightly prosocyrt above, and orthocline below the selenizone, and opisthocyrt on the base, respectively. Remarks — This form, with its very low whorls, selenizone being concave and situating well below the mid-whorls, stands apart the typical Leptomaria species. The spire angle is similarly low in "Pleurotomaria Phileta" of D'ORBIGNY (1853), which shows the concave selenizone also below