Two new Late Triassic nuculanoidean bivalve genera from north-west Yunnan, China
Abstract:The two new nuculanoidean bivalve genera Yongshengia n. gen. and Ningliconcha n. gen. with the type species Yongshengia cuneata (Chen, in Ma et al. 1976) and Ningliconcha ningliensis n. gen. n. sp. from Norian (Late Triassic) strata of north-west Yunnan Province, south-west China, both exhibit unusual morphologic features. Yongshengia is one of the largest nuculanoideans known and somewhat tentatively included into the Malletiidae. The new genus is further characterised by (1) a small resilifer, which is only present in right valves of adult growth stages and lacking in juvenile shells, (2) a shell sculpture consisting of two orders of commarginals and very weak radials, and (3) a particularly large posterior pedal retractor muscle scar. Ningliconcha is a small- to medium-sized malletiid with subtrigonal to subtrapezoidal shell shape and cancellate shell sculpture.
Document Type: Research Article
Publication date: 2008-09-01
More about this publication?
- Neues Jahrbuch für Geologie und Paläontologie continuously publishes current original contributions from all fields of geology, ever since its foundation in 1807. All published contributions are in the English language.
- Editorial Board
- Information for Authors
- Subscribe to this Title
- Ingenta Connect is not responsible for the content or availability of external websites