Periloculina (?) decastroi n. sp., a new foraminifer from the Eocene (uppermost Ypresian-lowermost Lutetian) Trentinara Formation (southern Apennines, Italy)

A new species, Periloculina (?) decastroi is described from a restricted shallow water facies (Trentinara Formation) of the southern Apennines, Tyrrhenian side. It was collected from a succession located near Lauria (Potenza, Basilicata, southern Italy). The megalospheric form shows an early quinqueloculine stage followed by a triloculine one, later tending to become biloculine. No monoloculine stage was observed. The microspheric form is very rare. Thickening of the endoskeletal basal layer gives rise to rough ribs, that usually reach the chamber roof. The aperture is simple and provided with a tooth; a multiple one (trematophorate aperture?) may occur sometimes in the ultimate adult chambers. The new species was found in the upper part of the Trentinara Formation (uppermost Ypresian-lowermost Lutetian).