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The genus Leptomaria E Eudes-Deslongchamps, 1864 (Gastropoda, Pleurotomariidae) from the Early Bajocian of Luxembourg: systematics and paleobiogeography.
No full textFour species of the pleurotomariid genus Leptomaria E Eudes-Deslongchamps, 1864 are reviewed based on previously undescribed material from Bajocian deposits of the eastern Paris Basin. One of them, Leptomaria nicsimoni sp. nov., is introduced as a new species. A critical revaluation of the literature shows that Leptomaria has been broadly interpreted in the past, in contrast with the rather detailed description given by its author. This focused on shell characters, such as the width and position of the slit and selenizone, which have been overlooked by most subsequent authors. A revised diagnosis that reintroduces these characters is presented on the basis of the Bajocian material studied and of a survey of the relevant literature. This diagnosis, which is based also on other characters not considered before, excludes from Leptomaria several species previously assigned to it. The genus occurred from the Middle Aalenian to the Cenomanian mainly in the epicontinental seas of western Europe. It experienced a peak of diversity in the Bajocian, followed by a slow decline in Bathonian to Callovian times concomitantly with the appearance of the genus in the south-eastern margin of Tethys. Records in Upper Jurassic to Cretaceous sediments are sparse
Rediscovered types of Turridae (Gastropoda) in the Mayer-Eymar collection of the Naturhistorisches Museum Basel
No full textSystematic revision of the conoidean species of the genus Asthenotoma Harris & Burrows, 1891 from the Italian Neogene
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Paradrilliola and Helicodrillia: two new genera of Turridae (Mollusca: Gastropoda) from the European Tertiary
No full textIl genere Asthenotoma Harris & Burrows, 1891 e la sua specie-tipo Pleurotoma meneghinii Mayer, 1868 (Gastropoda: Turridae)
No full textMolluscan cryptochromy as a taxonomic tool: the example of the turrid gastropod Gemmula galvanii (Bellardi)
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Pleurotoma meneghinii Mayer, 1868 (currently Asthenotoma meneghinii; Mollusca, Gastropoda): proposed replacement of neotype by rediscovered lectotype
No full textVolume: 50Start Page: 209End Page: 21
Pleurotomaria Defrance, 1826 (Gastropoda, Mollusca) from the Lower Bajocian (Middle Jurassic) sediments of Luxembourg, with considerations on its systematics, evolution and palaeobiogeographical history
No full textPleurotomaria species from Lower Bajocian
(Middle Jurassic) sediments of south-western Luxembourg
housed in the National Natural History Museum of Luxembourg are described. Seven species are recognized, one of
which is new, Pleurotomaria faberi sp. nov. A more detailed
definition of the diagnostic characters of the genus is proposed and the morphological continuity between Talantodiscus
and Pleurotomaria is demonstrated, suggesting that the
former cannot be considered as a distinct taxon. The palaeoecology, evolution and palaeobiogeographical history of
Pleurotomaria are outlined. Pleurotomaria presumably first
appeared in late Middle Triassic of New Zealand where it
underwent a relative diversification up to the Hettangian
(Early Jurassic). From Early Hettangian, most of its evolutionary history took place in Europe and western Tethys. In
the European epicontinental seas, Pleurotomaria experienced
two important radiations. The first occurred in the Early
Jurassic, with a peak in the Late Pliensbachian, and was
marked by an expansion of the distribution to the central
part of western Tethys. After a collapse in species diversity,
probably related to the Early Toarcian anoxic event, a second
radiation occurred. This culminated in the Early Bajocian
and was mainly confined in a region encompassing southern
England, Paris Basin and southern Germany. Low-spired species, formerly attributed to Talantodiscus, probably originated
independently and iteratively during the history of Pleurotomaria. The facies and associated benthic faunas suggest that
Pleurotomaria probably lived on shallow soft bottoms composed of mixed calcareous–siliciclastic sediments. The two
main Early Jurassic and early Middle Jurassic radiations of
the genus took place in these environments. Records of the
genus in Jurassic carbonate platform deposits are very few
and concern mainly post-Bajocian species
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