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Figure 2; Different views of voucher specimens of Ennea serrata d’Ailly, 1896 from Musake Haus, Mount Cameroon (A–E ZMB 101777) and E. nigeriensis sp. n. (F–J and K–M RMNH.MOL.341195). Scale bar: 2 mm.
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Figure 3; Computerised tomographic images of holotype shells of Ennea serrata d’Ailly, 1896 (A–E SMNH Type-956) and E. nigeriensis sp. n. (F–J RMNH.MOL. 341194). A, F external shell in frontal view B, G internal shell in frontal view C, H internal view of body whorl, showing columella, angular lamella, and palatal fold(s) (indicated by arrow) D, I view of body whorl ceiling, showing course of angular lamella E–J ad-apertural view in body whorl, showing course of angular lamella. Holotype shells are of different dimensions but are scaled to approximately the same size here.
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Figure 4; A–C Shells of Ennea cf. thompsonae Connolly from Du River, Liberia (MCZ 77331), identified and illustrated by Degner (1934b, fig. 8a–c) as Ptychotrema (Parennea) sulciferum. D, E enlarged views of body whorl of shell C arrows pointing to second external furrow (D) and second palatal fold in aperture (E). Scale bar: 2 mm (A–C).
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Figure 5; A–D Shell of Ennea cf. perforata d’Ailly reported by van Bruggen (1991) as Ptychotrema (Parennea) aequatoriale. E–H shell of Parennea equatorialis (Pilsbry, 1919) from Yanongo, DR of Congo (RMNH.MOL.273704). Scale bar: 1 mm.
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Figure 1; Different views of holotype shells of Ennea serrata d’Ailly, 1896 (A–F SMNH Type-956) and E. nigeriensis sp. n. (G–K RMNH.MOL.341194). Scale bar: 2 mm.
