Neridomus, Morris et Lycett, 1851

Neridomus View in CoL ? sp.

( Figs 54–56 View Figs 51–71 )

Material – Single specimen (GBA 2019/009/0032) from the box, labelled as “New species”.

Measurements – GBA 2019/009/0032, H = 12.2 mm, D = 11.8 mm.

Description – The subglobular shell consists of three rapidly increasing teleoconch whorls and the protoconch that is damaged but seems to be rather large and globular. Almost all whorls are evenly convex but a narrow, shallow concave belt accompanies the otherwise almost flush suture along about a whorl length partly on the penultimate then on the last whorl. The adapertural quarter of the last whorl is downward turned, which indicates the full grown stage of the shell. Whole surface of the teleoconch lacks any ornament, only straight, prosocline growth lines are visible on the whorls with a short prosocyrt part along the adapical suture.

Remarks – Without knowledge of the peristome and the protoconch, the identification remains uncertain even on the genus level. The downward bending latest part of the shell is not characteristic in Neridomus , therefore the genus level identification seems really uncertain. Anyway, this single find indicates sporadic and/or temporary presence of neritoidean gastropods also in the Hierlatz Alpe fauna.

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