Palaeozoic
Molluscs of Uncertain Systematic Position
(existing only as
fossils)
Uncertain
position (Gastropoda or
Monoplacophora)
- unassigned to superfamily
- Khairkhaniidae †
- Ladamarekiidae †
- Metoptomatidae †
-
Patelliconidae †
-
Protoconchoididae †
-
Archinacelloidea
-
Archinacellidae †
-
Archaeopragidae †
-
Pelagielloidea
-
Pelagiellidae †
-
Aldanellidae †
-
Scenelloidea
-
Scenellidae †
-
Coreospiridae †
-
Igarkiellidae †
-
Yochelcionelloidea
-
Yochelcionellidae †
-
Stenothecidae †
-
Trenellidae †
With
isostrophically coiled shells of uncertain position (Gastropoda or
Monoplacophora)
-
Bellerophontoidea
-
Bellerophontidae †
-
Bucanellidae †
-
Bucaniidae †
-
Euphemitidae †
-
Pterothecidae †
-
Sinuitidae †
-
Tremanotidae †
-
Tropidodiscidae †
With
anisostrophically coiled shells of uncertain position (Gastropoda?)
-
Euomphaloidea
-
Euomphalidae †
-
Helicotomidae †
-
Lesueurillidae †
-
Omphalocirridae †
-
Omphalotrochidae †
-
Macluritoidea
Basal taxa that are certainly Gastropoda
- unassigned to superfamily
-
Anomphalidae †
-
Codonocheilidae †
-
Crassimarginatidae †
-
Holopeidae †
-
Isospiridae †
-
Opisthonematidae †
-
Paraturbinidae †
-
Planitrochidae †
-
Pragoserpulinidae †
-
Pseudophoridae †
-
Raphistomatidae †
-
Rhytidopilidae †
-
Scoliostomatidae †
-
Sinuopeidae †
-
Clisospiroidea
-
Clisospiridae †
-
Onychochilidae †
-
Loxonematoidea
-
Loxonematidae †
-
Palaeozygopleuridae †
-
Ophiletoidea
-
Straparollinoidea
-
Trochonematoidea
-
Trochonematidae †
-
Lophospiridae †
Return to:
Systematics of Gastropoda.