Laevitomaria, Conti et Szabo, 1987

Szabó, János, 2017, Gastropods of the Lower Jurassic Hierlatz Limestone Formation, part 3. New pleurotomarioideans from the fauna of Hierlatz Alpe (Hallstatt, Austria), Fragmenta Palaeontologica Hungarica 34, pp. 9-48 : 43

Laevitomaria ? sp.

( Figs 131–133 )

Material – A single specimen (GBA 2018/002/0013), consisting of four whorls of an early teleoconch.

Measurements – Diameter: 11 mm.

Description – A conoidal shell, which has convex and rather high whorls without angulation on the surface between the sutures, and with a wide midwhorl selenizone. A rounded angulation is the transition from the whorl surface to the base, which is slightly convex with convex wall; there is no information about its axial region.

The ornament consists of two kinds of network of equally strong collabral and spiral threads on the last two whorls of the specimen; the adapical whorl has an early network that is more regularly built than that of the subsequent whorl. The ornament of the selenizone is composed of a thin thread slightly above the midline and sparse, asymmetric lunulae. Only spiral threads ornament the base.

Remarks – This shell has higher and more convex whorls than the other two Laevitomaria species of this paper. Since the last whorl is comparable to some Bathrotomaria species just before development of the angulation of the whorl surface, the genus identification is questionable.

Distribution – Within Sinemurian to lowermost Pliensbachian (Lower Jurassic) part of the Hierlatz Limestone Formation in Hierlatz Alpe, Hallstatt, Austria.

Figures

Figs 131–139. Laevitomaria species.– 131–133.Laevitomaria? sp. (GBA 2018/002/0013).– 131– 132. Lateral view (×3.6 and ×1). – 133. Basal view (×3.6). – 134–136. Laevitomaria periferialis (Szabó, 1980) (GBA 2018/002/0011/01). – 134–135. Lateral view (×2 and ×1). – 136. Apertural view (×2). – 137–139. Laevitomaria sp. (GBA 2018/002/0012). – 137–138. Lateral view (×1 and ×3). – 139. Apical view (×3)