Abstract
Two new genera of the Chonostrophiidae are proposed herein to accommodate the resupinate shells from the Famennian sediments of the Late Devonian in the Santanghu Basin of the Balikun area, Xinjiang Province, northwestern China.Santanghuia santanghuensisnew genus and species is distinguishable from other chonostrophiids by the possession of a pair of long dorsal anderidia and absence of a dorsal median septum.Balikunochonetes liaoinew genus and species is distinct because of the presence of a pair of anderidia with secondary anderidia, and a dorsal median septum.Santanghuianew genus is considered to be phylogenetically related toChonostrophiaof late Early to Middle Devonian age, whileBalikunochoneteshas possibly given rise toChonostrophiellaof Early Devonian age and is a likely ancestor ofTulcumbellaof Early Carboniferous age.
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