Table 9
Ten morphological differences between "Stiobia" and Nymphophilus
| "Stobia" | Nymphophilus |
|---|---|
| operculum with 3.5 whorls | 5.5-6.0 whorls |
| osphardium short | Osphradium elongate |
| central tooth of radula with pair of basal cusps | 3 pairs |
| male gonad overlaps stomach | male gonad posterior to stomach |
| male gonad a single-lobed mass | male gonad bush-like |
| penis with a singular glandular ridge | 1-3 glandular ridges |
| penial lobe slender, with single fold | penial lobe stout, with many folds |
| bolster and ventral channel poorly developed | bolster and ventral channel well developed |
| bursa small (.21 of pallial oviduct length), dorsal to pallial duct, with a short duct | bursa large (.32 of pallial oviduct length), posterior to pallial duct, long a short duct |
| opening of common genital aperature at end of pallial oviduct | opening of common genital aperature lateral to pallial oviduct |