Euonyma tugelensis ( Melvill & Ponsonby, 1897 )

Muratov, Igor V., 2010, Terrestrial molluscs of Cabo Delgado and adjacent inland areas of north-eastern Mozambique, African Invertebrates 51 (2), pp. 255-255 : 270

Euonyma tugelensis ( Melvill & Ponsonby, 1897)

Fig. 27

Subulina tugelensis: Melvill & Ponsonby 1897: 637 , pl. 17, fig. 9 (Lower Tugela River, Natal; 14× 4 mm). Five damaged shells found at two stations inland, although similar in size to Opeas cressyi Connolly, 1922 (type: 10.8× 2.8 mm) from central Mozambique, are not as elongated as that species. The largest (damaged) shell from the study area measures 8.2× 3.1 mm and is similar in size and proportions to Opeas durbanense (8.7× 3.3 mm) described by Sturany (1898: 61, pl. 2, figs 42–44) from the coast of KwaZulu-Natal. Herbert and Kilburn (2004: 133) treated durbanense as a synonym of tugelensis . Differs from the following species, as well as from common and similarly sized Allopeas clavulinum ( Potiez & Michaud, 1838) , by the extremely narrow umbilical slit.

Figures

Figs 26–29.Subulinidae:(26)Curvellanyasana,10.6×5.7mm,stn1;(27) Euonymatugelensis,7.2×2.6mm,subadult,stn1;(28) Opeashannense,5.4×1.8 mm,stn1;(29)Allopeas? cf.acmella, 4.0×1.2 mm,stn 7.