Brachiopod etching trace Podichnus, typically with centrifugally arranged clusters of holes orslits, has hitherto been known only in calcium carbonate substrates. The similar etching trace is newlydescribed on calcium phosphate substrate. The trace Podichnus isp. in a wall of a phosphatic byronid testwas observed in the lower Devonian Vinařice Limestone (Pragian) in the Koněprusy area of the PragueBasin in the Barrandian area, the Czech Republic. The trace is smaller that majority of described speciesof this fixichnia, and displays a smooth central disc surrounded by two circlets of holes or pits. Someholes penetrate through wall of byronid test without any biotic response of a byronid. The maker of Pod-ichnus isp. is uknown but among the associated fossils are eligible candidates including rhynchonellids,orthids and terebratulids. It is rare direct evidence of etching activity of the pedicle in the Lower Palaeo-zoic and the first finding of Podichnus in the Devonian in the Prague Basin. The emended diagnosis ofthe ichnogenus is presented herei