ammonites
Protoanidanthus umbonatus Shi and Waterhouse 1996 (lamp shell)

Strophomenata - Productida - Linoproductidae

Full reference: G. R. Shi and J.B. Waterhouse. 1996. Lower Permian brachiopods and molluscs from the upper Jungle Creek Formation, northern Yukon Territory, Canada. Geological Survey of Canada Bulletin 424:1-241

Belongs to Protoanidanthus according to G. R. Shi and J.B. Waterhouse 1996

Sister taxa: Anidanthus achengensis, Anidanthus asinus, Anidanthus boikowi, Anidanthus cessnockensis, Anidanthus compactus, Anidanthus diksoni, Anidanthus eucharis, Anidanthus fusiformis, Anidanthus guichiensis, Anidanthus halinae, Anidanthus horqinensis, Anidanthus indecorus, Anidanthus interruptus, Anidanthus megensis, Anidanthus minor, Anidanthus mizukoshiensis, Anidanthus mucronata, Anidanthus mucronatus, Anidanthus pokolbinensis, Anidanthus rugosus, Anidanthus sarytchevae, Anidanthus shastensis, Anidanthus sinosus, Anidanthus springsurensis, Anidanthus ulanhotensis, Anidanthus ussuricus, Anidanthus victori, Protoanidanthus enaagardi, Protoanidanthus gosforthensis

Type specimen: GSC 97128. Its type locality is JBW89, Ettrain Creek, which is in a Sakmarian marine sandstone in the Jungle Creek Formation of Canada.

Ecology: stationary low-level epifaunal suspension feeder

Average measurements (in mm): valve 11.3 x 18.8