†Ptychagnostus (Acidusus) Opik 1979 (artiopod)

Artiopoda - Agnostida - Ptychagnostidae

Parent taxon: Ptychagnostus according to Opik 1979

See also Jell and Adrain 2002, Sepkoski 2002 and Weidner and Nielsen 2014

Sister taxa: Ptychagnostus (Ptychagnostus), Ptychagnostus acidusus, Ptychagnostus affinis, Ptychagnostus akanthodes, Ptychagnostus aksayensis, Ptychagnostus atavus, Ptychagnostus convexus, Ptychagnostus cuyanus, Ptychagnostus intermedius, Ptychagnostus karatauensis, Ptychagnostus punctuosus, Ptychagnostus richmondensis, Ptychagnostus seminula, Ptychagnostus sinicus, Ptychagnostus spinosus, Zeteagnostus scarifatus, Zeteagnostus incautus, Triplagnostus (Aristarius) aristarius

Subtaxa: Ptychagnostus (Acidusus) germanus

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Ecology: nektonic suspension feeder

Distribution:

• Cambrian of Australia (1 collection), United States (1: Utah)

Total: 2 collections each including a single occurrence

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