Diagnoza

Protoconch of about two whorls, almost coaxial, smooth. Shell conoidal, 1.70 times as high as broad. Whorls weakly rounded with subsutural, narrow ramp. Teleoconch ornamented with two adapical and two−three abapical spiral pitted striae. Shape of pits hexagonal. During ontogeny, some adapical striae moving to ramp and others forming wide, pitted furrow. Base covered with evenly spaced spiral, pitted striae. Peristome with two oblique folds. Umbilical chink absent.

Porównanie

Species of the genus Acteon have rhomboidally or rectangularly shaped pits and only one columellar fold which is visible on thefully grown shells. In T. gazdzickii two folds are clearly visible even on the juvenile shells.

Autekologia

Występowanie geograficzne

Wąwał near Tomaszów Mazowiecki, Poland.

Zasięg czasowy

Valanginian, Early Cretaceous.

Materiały muzealne

ZPAL: 996 shells.

Literatura

Kaim, A. 2004. The evolution of conch ontogeny in Mesozoic open sea gastropods. Palaeontologia Polonica 62, 3–183.

Schröder, M. 1995. Frühontogenetische Schalen jurassicher und unterkretazischer Gastropoden aus Norddeutschland  und Polen. Palaeontographica, Abteilung A 238, 1–95.