The genusLeptomariaE Eudes-Deslongchamps, 1864 (Gastropoda, Pleurotomariidae) from the Early Bajocian of Luxembourg: systematics and paleobiogeography

Gastropods from the Jurassic neptunian sills of Rocca Busambra (north‐western Sicily, Italy): Patellogastropoda, Pleurotomarioidea, Scissurelloidea, Fissurelloidea and Eucycloidea

“…The genera ascribed here to the family Pleurotomariidae Swainson, 1840 share with Pleurotomaria Defrance, 1826 the earliest teleoconch whorls that are evenly convex, ornamented by a sharp and regular network of spiral threads and collabral riblets, and bearing a concave to flat selenizone at or slightly below mid‐whorl (Monari & Gatto 2013). A very similar early teleoconch is present in other pleurotomariid genera, like Bathrotomaria Cox, 1956, Leptomaria E. Eudes‐Deslongchamps, 1864, Obornella Cox, 1959 and Szabotomaria Monari et al ., 2017 (Monari & Gatto 2014; Monari et al . 2018).…”

“…The selenizone of the adult shell is flush or slightly elevated in post‐juvenile stage and edged by distinct striae whereas in Trapanimaria it is concave and sunken between two spiral cords or threads. Moreover, in Leptomaria the peripheral bulge is commonly absent (see Monari & Gatto 2014 for further details). In Obornella Cox, 1959 the adult shell is sublenticular with a cord‐shaped selenizone running close to the abapical suture, a very narrow outer face almost completely covered by the subsequent whorl, and a much stronger ornament pattern.…”

Vetigastropoda and Neritimorpha from the Lower Bajocian of Luxembourg and palaeobiogeography of Aalenian–Bajocian (Middle Jurassic) gastropods of western Europe

“…Bathrotomaria differs from Szabotomaria in that the selenizone is placed on the angulation of the whorls, although in Szabotomaria a very obtuse angulation at the selenizone appears occasionally on the final part of the last whorl. Leptomaria, as defined by Monari & Gatto (2014), has a much narrower selenizone and deeper slit, and the whorls lack a distinct ramp. In Laevitomaria, the spire is higher, the periphery is sharper and the ramp is absent (Gatto et al 2015b).…”

“…Recently, a detailed study of a rich collection of Early Bajocian gastropods from southern Luxembourg localities was undertaken by the present authors in order to reconstruct the diversity and trace the recovery of these molluscs after the extinctions associated with the Toarcian Anoxic Event (Jenkyns 1988;Caruthers et al 2013;Gatto et al 2015a and references therein). The first outcomes of this research were the revisions of the pleurotomariid genera Pleurotomaria Defrance, 1826 (Monari & Gatto 2013), Leptomaria Eudes-Deslongchamps, 1864 (Monari & Gatto 2014), and Laevitomaria Conti & Szabó, 1987(Gatto et al 2015b). The present paper concludes the review of the vetigastropods and describes the neritimorph gastropods from the studied area.…”

First Cretaceous (Albian) invertebrate fossil assemblage from Batavia Knoll, Perth Abyssal Plain, eastern Indian Ocean: taxonomy and paleoecological significance

“…According to a review of the genus by Monari and Gatto (2013), Leptomaria ranged from the Aalenian (Middle Jurassic) to lower Cenomanian (Late Cretaceous) in Europe, from the Pliensbachian to Toarcian (Early Jurassic) in Argentina, and was found during the Callovian (Middle Jurassic) in southern India.…”