The youngest record of "Housean pits" in late Devonian ammonoids

Abstract

An unusual occurrence of parasitic "Housean pits" in an internal mould of an ammonoid referred to as Felisporadoceras cf. subvaricatum (Sobolew, 1914) from the middle Famennian of Poland is described here. Until now, the youngest goniatites showing pitting on the internal moulds were known from the Middle Devonian (early Givetian). This material probably constitutes the youngest record of this phenomenon in goniatites.