Mollusca		ROSTROCONCHIA
Basal Mollusca		Cladogram

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Rostroconchia Cladogram

Conchifera (Helcionelloida) |--Monoplacophora `--+--Diasoma | |--ROSTROCONCHIA | | |--RIBEIRIOIDA | | `--CONOCARDIOIDA | `--Bivalvia `--Cyrtosoma

One possible arrangement is the following.  Note however that it is both inconsistent with our backbone phylogeny and does not account for the Ribeirioida. 

<==o "ROSTROCONCHOMORPHA"
  `--+--Stenothecidae [Helcionellida; = "Pararostroconchs"]
     |--+-- Heraultipegma varensalense
     |   `-- Watsonella crosbyi
     `--+--+-- Taurangia paparua
        |  `-- Pseudomyona queenslandica
        `--o ROSTROCONCHIA
           |--Eopteroidea
           `--o Conocardioidea
              |-- Hippocardiidae
              |-- Bransoniidae
              `--+-- Conocardiidae
                 `-- SCAPHOPODA 

References:
Wagner [no date]
Engeser and Riedel 1997