Gastropods from the Carboniferous (Namurian) of Congleton Edge, Cheshire,UK

Abstract

Gastropod assemblages of late Carboniferous age (Namurian; Chokierian–Alportian) from the Morridge Formation at Pot Bank Quarry, Congleton Edge, Cheshire, contain 27 species, the most diverse gastropod fauna known from the Silesian of the southern UK. Chokierian sandstones yield a sparse assemblage of mainly high‐spired Stegocoelia and bivalves, but flooding associated with the Hudsonoceras proteus marine band (basal Alportian) introduced a diverse invertebrate fauna in which the gastropod fraction is dominated by the bellerophontoideans Bellerophon, Retispira, Euphemites and Patellilabia, and the eotomarioid Angyomphalus. A later, previously unrecognized marine assemblage of probable Alportian age contains numerous small pleurotomariiform gastropods, but bellerophontoideans are less common and Angyomphalus is absent. In formal international usage the assemblages are of Pennsylvanian (Bashkirian Stage) age. One new genus Liraloron cornoviorum gen. et sp. nov. and the following new species are described: Retispira mowensis, Patellilabia britannica, Angyomphalus congletonensis, Neilsonia coatesi, N. ganneyica, Eirlysia ceramicorum, Meekospira acrolopha.

Taxonomy and diversity of slit‐band gastropods (Order Pleurotomariida) and some slit bearing Caenogastropoda from the Pennsylvanian of the USA

“…Similar spiral cords are also present in some species of Glabrocingulum such as the specimens placed in Glabrocingulum ( Ananias ) cf. talpaensis in this study and Glabrocingulum ( Glabrocingulum ) armstrongi reported by Peel (2016, fig. 9Q).…”

“…talpaensis differs from other Glabrocingulum species studied here in having spiral cords on its early teleoconch and in being very small. Peel (2016, fig. 9Q) figured the juvenile whorls of G. ( G .)…”

“…nov. is higher spired and has much shorter subsutural nodes. Neilsonia coatesi Peel, 2016 and N. ganneyica Peel, 2016 both from the Carboniferous of the UK, are herein placed in Peruvispira due to the position of the abapical suture well below the selenizone ( Pe. coatesi (Peel, 2016) comb.…”

“…(1960) treated Trepospira and Angyomphalus as subgenera of Trepospira . Later, both taxa were used at the genus level (Shikama & Nishida 1968; Blodgett & Johnson 1992; Peel 2016). Trepospira differs from Angyomphalus by having an umbilical callus.…”

“…However, the early ontogeny of many pleurotomariid taxa, particularly those from the Palaeozoic, is unknown except for a few examples (e.g. Yoo 1994; Frýda & Blodgett 2004; Peel 2016; Mazaev 2017) because of the generally poor preservation of the Palaeozoic fossils. The excellent preservation in a few Palaeozoic formations such as the Pennsylvanian Boggy Formation from Buckhorn Asphalt Quarry and the Pennsylvanian Finis Shale, which are called impregnation Lagerstätte and liberation Lagerstätte respectively (Seuss et al .…”