Mollusca		Paragastropoda
GASTROPODA		Cladogram

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Paragastropoda Cladogram

Gastropoda (stem group)
|--PARAGASTROPODA  
|  |--PELAGIELLIDA
|  `--MIMOSPIRIDA
|     |--ONYCHOCHILIDAE  
|     `--+--CLIOSPIRIDAE  
|        `-?OMPHALOCIRRIDAE  
`--+--Tergomya (paraphyletic)
   `--Gastropoda (crown group)  

<== o HELCIONELLOIDA
   |-- Helcionella subrugosa
   |-- Oelandia rugosa
   `--+-- Latouchella merino
      `--+-- Coreospirida
         `--+--+-- Euomphalopsis involuta
            |  `-- Macluritella? walcotti
            `--+--o PARAGASTROPODA
               |  |--o Pelagiellida (= Pelagielloidea)
               |  |  `--o Pelagiellidae
               |  |     |-- Costipelagiella zazvorkai
               |  |     `-- Pelagiella subangulata
               |  `--o Mimospirida (= Onychochiloidea) 
               |     |--o Onychochilidae
               |     |   |-- "Maclurites" thomsoni
               |     |   `--+-- Scaevogyra swezeyi
               |     |      `--+-- Kobayashiella circe
               |     |         `--o Matherella/Matherellina
               |     |            |-- Matherellina walcotti
               |     |            `-- Matherella saratogensis
               |     |--o Cliospiridae
               |     |   |-- Cliospirinae
               |     |   |-- Trochoclisinae
               |     |   `-- Atracurinae
               |     | ?-- Omphalocirridae  (gastropod or paragastropod)
               |     | ??--Macluritidae  (probably gastropod, possibly paragastropod)
               |     `--o Yangtzespiriidae
               `--o "TERGOMYANS"

References

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