Abstract
Vetigastropod and neritimorph species from Lower Bajocian (Middle Jurassic) sediments of south-western Luxembourg are described. Eighteen species are recognized. Two new genera – Szabotomaria gen. nov. and Fabercapulus gen. nov. – and four new species – Szabotomaria ziqquratiformis sp. nov., Colpomphalus thuyi sp. nov., Colpomphalus tigratus sp. nov. and Fabercapulus semisculptus sp. nov. – are erected. These species, together with other species recently described from the same strata, are part of a diverse assemblage consisting of 32 species belonging to 14 genera in six families and five superfamilies, representing the richest vetigastropod-neritimorph fauna currently known from Bajocian and sub-coeval deposits of western Europe. An analysis of the palaeoecological and palaeobiogeographical relationships of this fauna and those from other areas of the western European shelf was performed using cluster analysis and by comparison of the respective taxonomic structures. The former detected a major cluster composed of two distinct branches: the faunas of the northern Paris-Wessex Basin, including Luxembourg, and those of the southern Germany basin. These faunas have similar taxonomic structures and occur mainly in facies represented by condensed iron ooid-rich marls and limestones deposited in lower offshore to upper offshore-shoreface settings. The close relationship between the Luxembourg and other faunas of the Paris-Wessex Basin reflects free faunal exchange and facies similarities. Slight differences in the sedimentary context could explain the separation of the southern German from the Anglo-Paris branch, whereas similarities between Swabian and Franconian faunas most probably reflect the geographical continuity of these areas. The Early Bajocian fauna of the East Midlands Shelf comes from sediments deposited in a shallow-water, oolitic barrier complex and is different from other western European faunas in both species composition and taxonomic structure.http://zoobank.org/urn:lsid:zoobank.org:pub:F4E70C4E-ECC3-49D9-9398-AC2C288F51A1
Highlights
The Paris Basin is an intracratonic sedimentary basin which was covered for most of the Mesozoic by an epicontinental sea extending over a large part of the north-western Europe at tropical to subtropical latitude (Mégnien 1980)
In the Lower and Middle Jurassic, the Luxembourg Basin was subjected to a shallow water sedimentary regime and conditions for well diversified benthic molluscan faunas established during Hettangian (Chapuis & Dewalque 1853; Monari et al, 2011) and Early Bajocian times
While the Middle Jurassic gastropods of the main Paris Basin have been extensively studied since the pioneering works by Eudes-Deslongchamps (1843a, b, c, d, e, f, 1849) and d'Orbigny (1851–1860), their coeval counterparts from the Luxembourg basin have long been neglected
Summary
The Paris Basin is an intracratonic sedimentary basin which was covered for most of the Mesozoic by an epicontinental sea extending over a large part of the north-western Europe at tropical to subtropical latitude (Mégnien 1980). Adult part of the shell and base ornamented by variably sized, numerous spiral threads or cords. 10) to Pleurotomaria subdecorata Münster in Goldfuss, 1844, from the lower Middle Jurassic of England, and the shell from the Upper Aalenian of Rhone (southern France) ascribed to the same species by Riche
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