| Paragastropoda | ||
| Mollusca | Paragastropoda |
Conchifera
└─Helcionelloida
└─► |
|||
◄─┬─Pelagiellida
└─Mimospirida |
Mollusca |
|
Abbreviated Dendrogram
Conchifera
╘═Helcionelloida
└─┬─Paragastropoda
│ ├─Pelagiellida
│ └─Mimospirida
│ ├─Onychochilidae
│ └─┬─Cliospiridae
│ └?─Omphallocirridae
└─┬─Bellerophontoidea (torted)
└─Gastropoda (crown group)
|
Contents
Overview |
 Drawing of the apical, apertural and basal view of Pelagiella atlantoides (Paragastropoda: Orthostrophina: Pelagielloidea: Pelagiellidae) From Matthew G.F. 1895. The Protolenus fauna. Transactions of the New York Academy of Sciences 14: 101-153. Pelagiella on the page 131. Plate VI., figure 6 a-c. Cropped, rotated and retouched by User:Snek01. via Wikipedia, Public domain. |
The Paragastropods are an enigmatic assemblage of early paleozoic molluscs, known from their gastropod-like coiled shells. There is no guarantee they are a monophyletic assemblage. Some or all of them may be Helcionelloids, Gastropods, or even some other group entirely. With little to go one either than hard shells and muscle scars, ear;y molluscan phylogeny is a highly problematic affair at best. For now we have followed Linsley and Kier in placing these animals ina distinct, and possibly paraphyletic, class of untorted, stem-group gastropods, the Paragastropods MAK120617
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