ulmonata — --- Opisthobranchia Prosobranchia 
Stylommatophora 
a =" = Gymnosomata 
(Limax, Amalia, Arion) ) P teropoda | ne 
amacidac x ecosomata 
‘ 
Testacellidae | Vaso- a 
pulmonata | x 
Helicidae | Nudibranchia 
(Hyalina) | . 
(Rhodope) 
Tracheopulmonata\ (Lymnaeidae) Abranchia Heteropoda 
b i Basommatophora mS AE 
< (J poe) I (Secreta) Monotocardia 
OS es os / 
Pa : Vaginulidae > jf, 
> Fe Tectibranchia : 
3 Oncidiidae / : 
pas Auriculidae Raper Kg 7 Azygobranchia } ecente 
5 ee x EG yi K Cyclobranchia ¢ Dioto- 
cH = (Siphonaria) » | ee . |eardia 
Propulmonata eg re — Zygobranchia . 
bites Sousa = (Actaeon) 
Diotocardia 
May ar enna Procochlides Gathalenels 
mphineura = 
en P Solenogastres _——__ Lamellibranchiata (Acephala) 
- S| ae 
2 Amphineura 
“a Proibllaska 
Stammbaum der Gasteropoden. 
