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A New Carcinosomatid Eurypterid From The Upper Silurian Of Northern Vietnam

2002; Wiley; Volume: 45; Issue: 5 Linguagem: Inglês

10.1111/1475-4983.00267

1475-4983

Simon J. Braddy, Paul A. Selden, Doan Nhât Truong,

Geological and Geophysical Studies

A new carcinosomatid eurypterid, Rhinocarcinosoma dosonensis sp. nov., and Hughmilleria sp., are described from the Dô Son Formation of the Dô Son Peninsula, northern Vietnam. R. dosonensis is characterized by podomere 7 of prosomal appendage VI produced into an anterodistal spine, a metastoma with a cordate posterior margin, and an indented opisthosomal differentiation (i.e. preabdomen–postabdomen margin is concave). The Dô Son Formation was originally interpreted as Late Devonian (Givetian/Frasnian) in age but the unit containing the eurypterid assemblage is now considered much older (Late Silurian). A deltaic palaeoenvironmental setting is interpreted from biotic associations and sedimentological evidence.