Upper Toarcian (Lower Jurassic) marine gastropods from the Cleveland Basin, England: systematics, palaeobiogeography and contribution to biotic recovery from the early Toarcian extinction event

Abstract

Here we describe a new upper Toarcian (Lower Jurassic) marine gastropod fauna from rocks of the Cleveland Basin exposed on the North Yorkshire coast of England. The fossil assemblage consists of 16 species, of which three are new: Katosira? bicarinata sp. nov., Turritelloidea stepheni sp. nov. and Striactaenonina elegans sp. nov. Four species are described in open nomenclature as Tricarilda? sp., Jurilda sp., Cylindrobullina sp. and Cossmannina sp. The other species have previously been described: Coelodiscus minutus (Sch€ ubler in Zieten), Procerithium quadrilineatum (R€ omer), Pseudokatosira undulata (Benz in von Zieten), Palaeorissoina aff. acuminata (Gr€ undel), Pietteia unicarinata (Hudleston), Globularia cf. canina (Hudleston), Striactaeonina cf. richterorum Schulbert & N€ utzel, Striactaenonina aff. tenuistriata (Hudleston) and Sulcoactaeon sedgvici (Phillips). Most of these species are the earliest records of their respective genera and show palaeobiogeographical connections with

Extinction cascades, community collapse, and recovery across a Mesozoic hyperthermal event

“…Although the increase in the number of linear chains in the late recovery as compared to the early recovery suggests that food web shape could be starting to return towards pre-extinction levels with the greater diversity of benthic guilds, it may also be a result of changing ecosystem structure brought about by the progression of the Mesozoic Marine Revolution (MMR) 57 . The late recovery interval contains a much more diverse array of benthic predators from groups that were supposedly key drivers of the MMR, such as decapod crustaceans 58 , gastropods 59 and echinoderms 60 and such changes in benthic community composition may be driving some of the stepwise increase in maximum trophic level through the system, which deviates from the common pattern of perturbation before return to pre-extinction levels as seen in most of the other structural metrics and motifs (Figs 2 and 3).…”

First report of Euthyneura (Heterobranchia: Gastropoda) in the Early Jurassic of Southern Patagonia, Argentina

“…The genus Cossmannina has been restricted during the Early Jurassic to the western Tehyan region. It occurred in the Hettangian of France (see Gründel and Nützel, 2012, p. 93) and in the Pliensbachian of Germany and England Nützel, 1998, 2012;Gründel, 2007;Nützel and Gründel, 2015;Ferrari et al, 2021) (Fig. 3).…”

“…Early Jurassic Euthyneura (Heterobranchia) has been reported in the western Tethyan region (Gründel, 2007(Gründel, , 2010Gründel et al, 2011;Nützel, 1998, 2012;Nützel and Gründel, 2015;Ferrari et al, 2021) and few species of this clade have been also described from northern Africa (Cox, 1965;Bourrouilh, 1966). The families Cylindrobullinidae and Tubiferidae are important components of the earliest radiation of Euthyneura which took place during the earliest Mesozoic (Dinapoli and Klussmann-Kolb, 2010).…”