Table 15 Putative distinguishing features between P. milaschewitchii and P. verrucosa (intraspecific variation not evaluated)
From: How to describe a cryptic species? Practical challenges of molecular taxonomy
| Â | P. milaschewitchii(Kowalevsky, 1901) | P. verrucosa(Challis, 1970) |
|---|---|---|
Data source | Jörger et al. 2008 [55] | Present study |
Epidermal glands | Predominantly whitish, blue stained only in one small row | Predominantly whitish and numerous dark blue stained ones |
Nervous system | Eyes pigmented and externally visible | Eyes unpigmented |
Reproductive system | Only one cephalic male genital opening detected | Two male genital openings (cephalic and visceral) |
Digestive system/ putatively different feeding habits | Lateral radula teeth with central denticle | Lateral radula teeth without denticle |
Lipid-like droplets in digestive gland | Refracting fusiform structures |