Notes on Ptychotrema (Ennea) bequaerti (Dautzenberg & Germain)

The genus Ptychotrema (Mörch) L. Pfeiffer, 1853, which has a great number of representatives in tropical Africa, is characterized among the Streptaxidae by one or more deeply situated palatal folds indicated externally by an equal number of spiral furrows on the back of the last whorl. It is subdivided into three subgenera, Ptychotrema s. str., Ennea H. & A. Adams, 1855, and Parennea Pilsbry, 1919. ¹) Ptychotrema s. str. has the aperture with 3 or more folds or teeth within the outer lip, at least one suprapalatal fold, and two spiral furrows on the back of the last whorl.