Mollusca		Orthogastropoda
GASTROPODA		Orthogastropoda

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Orthogastropoda

GASTROPODA (stem group)
|--PARAGASTROPODA
`--+--TERGOMYA (paraphyletic)
   `--Gastropoda (crown group)  
      |--EOGASTROPODA  
      |  |--Euomphalida  
      |  `--PATELLOGASTROPODA
      `--ORTHOGASTROPODA  
         |--Sinuopeidae etc. 
         `--Murchisoniida  
            |--NERITOPSINA
            |  |--Neritoida
            |  `--VETIGASTROPODA
            `--+--Apogastropoda
               `--Pulmonata

Unit Contents

Orthogastropoda
Sinuopeidae etc. (Archaegastropoda)

Page Contents

Introduction

Orthogastropoda:

Range: from the Late Carboniferous (Dolgellian)

Phylogeny: Gastropoda : Eogastropoda + * : Murchisoniida ::: Neritopsida + Vetigastropoda + Cocculiniformia (may be polyphyletic?) + Apogastropoda

Characters: $ Plexo(rhipido) glessate buccal apparatus; pin-hole eyes; $ osphiadia with sensory cells; $ statocysts ventrally situated (all from Haszprunar 1988 p.9],

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page uploaded 6 March 2003
checked ATW050825
original material copyleft M. Alan Kazlev
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