Trochozonites (Crenatinanina) crenulata ( Germain, 1905 )

Muratov, Igor V., 2010, Terrestrial molluscs of Cabo Delgado and adjacent inland areas of north-eastern Mozambique, African Invertebrates 51 (2), pp. 255-255 : 281-282

Trochozonites (Crenatinanina) crenulata ( Germain, 1905)

Figs 51 , 53–55 Trochonanina crenulata: Germain 1905: 484 (Environs de Zanzibar; 11.0× 15.5 mm). Trochonanina (Crenatinanina) crenulata: Germain 1920: 75 , pl. 4, figs 3–5 ( Zanzibar; 10.0× 15.5 mm,

erroneously said to be “grandeur naturelle” in figures captions).

This appears to be a rediscovery of the species collected by Raffray in 1891 and not seen since 1920. The type, according to Germain in MNHN, could not be found there ( Rowson 2007: 451) .

Embryonic whorls (destroyed in the type and thus not previously described) with weak close-set microscopic axial riblets cut by much finer spiral lines.

All shells found at the three stations on Cabo Delgado are proportionally higher than the type, but some worn adult shells are up to 10.3× 15.2 mm, approaching the size and proportions of the type. The shell illustrated in Figs 53–55 is faded, smaller than the type but similar in shape .

Figures

Figs 46–52. Euconulidae:(46) Microcystina minima, 0.68×1.20 mm, stn 7; (47) Afroguppya rumrutiensis, 1.3×1.9 mm,stn 7; Helicarionidae:(48)“Sitala” jenynsi, 10.5×16.0 mm,stn 12; (49) Trochonanina albopicta, 7.5×11.5 mm,stn 5; (50) T.bloyeti, 5.8×12.0mm,stn 17; (51) Trochozonites crenulata, 9.3×12.0 mm, subadult, stn 7; (52) Quickia concisa, 6.0×3.9 mm, stn 7. Scale bar 1 mm in Figs 46–47; 5 mm in Figs 48–52.

Figs 53–55. Trochozonites (Crenatinanina) crenulata, 8.2×12.8 mm, subadult, three views, stn 9.