Palaeos		Rostroconchia
Mollusca		Dendrogram

Rostroconchia: Dendrogram

MOLLUSCA
|--ACULIFERA
`--CONCHIFERA
   |==TRYBLIDIIDA (Monoplacophora)
   |   `--CEPHALOPODA
   `==HELCIONELLOIDA
       |--ROSTROCONCHIA
       |  |--+--Conocardiida
       |  |   `--+==Ribeirioida
       |  |      `--SCAPHOPODA
       |  `--BIVALVIA
       `--GASTROPODA

Rostroconchia Dendrogram

Rostroconch phylogeny remains contentious. 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 

The following more complex dendrogram is by Christpher Taylor CKT071117 and mainly dfscuses on the Conocardioida (= Conocardiida)

  Rostroconchia
   |  i. s.: Hippocardia Brown 1843
   |           |--H. alborza
   |           |--H. bohemica (Barrande 1881)
   |           |--H. cunea (Conrad 1840)
   |           `--H. kermani Hoare & Aghababalu 2001
   |         Riberia apusoides Schubert & Waagen 1903
   |         Heraultipegma
   `--Conocardioida [Conocardioidea]
        |--Pseudobigaleaidae
        |    |--Pseudobigalea Hoare et al. 1982
        |    |    `--*P. crista Hoare, Mapes & Brown 1982 (see below for synonymy)
        |    |--Exalloschema Hoare, Mapes & Yancey 2002
        |    |    `--*E. batilia (Hoare, Mapes & Brown 1982) [=Hippocardia batilia]
        |    |--Minycardita Hoare & Plas 2003
        |    |    `--*M. sectilis Hoare & Plas 2003
        |    |--Baiosoma Hoare, Mapes & Yancey 2002
        |    |    |--*B. pala (Hoare, Steinker & Mapes 1988) [=Hippocardia pala]
        |    |    `--B. cucullata (Hoare et al. 1988) [=Hippocardia cucullata]
        |    `--Hadropipetta Hoare, Mapes & Yancey 2002
        |         |--*H. ancora (Hoare, Steinker & Mapes 1988) [=Hippocardia ancora]
        |         `--H. nevadaensis Hoare & Plas 2003
        |--Bransoniidae
        |    |--Pseudoconocardium Zavodowsky 1960
        |    |    `--*P. licharewi
        |    |--Bransonia Pojeta & Runnegar 1976
        |    |    |--*B. wilsoni Pojeta & Runnegar 1976
        |    |    `--B. robustum (Fletcher 1943) [=Conocardium robustum]
        |    `--Apotocardium Hoare, Mapes & Yancey 2002
        |         |--*A. lanterna (Branson 1965) (see below for synonymy)
        |         |--A. cordatum (Hoare et al. 1982) [=Pseudoconocardium cordatum]
        |         |--A. obliquum (Meek & Worthen 1875) [=Conocardium obliquum]
        |         |--A. plautum Hoare, Mapes & Yancey 2002
        |         |--A. polymitarium (Hoare et al. 1982) [=Pseudoconocardium polymitarium]
        |         `--A. snideri (Morgan 1924) [=Conocardium snideri, Pseudoconocardium snideri]
        `--Conocardiidae
             |--Conocardium Bronn 1835
             |    |--C. acadianum Dawson 1891
             |    `--C. nicholasensis Price 1921 (n. d.)
             |--Oxyprora Hoare, Mapes & Yancey 2002
             |    |--*O. parrishi (Worthen 1890) [=Conocardium parrishi]
             |    |--O. missouriensis (Girty 1915) (see below for synonymy)
             |    `--O. oklahomaense (Beede 1902) [=Conocardium oklahomaense]
             `--Arceodomus Pojeta & Runnegar 1976
                  |--*A. glabrata (Easton 1962) [=Conocardium glabratum]
                  |--A. angusta Hoare, Mapes & Yancey 2002
                  |--A. langenheimi (Wilson 1970)
                  |--A. prolata Hoare & Mapes 1990
                  `--A. sphairikos Hanger et al. 2002

*Apotocardium lanterna (Branson 1965) [=Conocardium lanterna, Pseudoconocardium lanterna]
Oxyprora missouriensis (Girty 1915) [=Conocardium missouriensis, Pseudoconocardium missouriensis]
Pseudobigalea crista Hoare, Mapes & Brown 1982 [=Pseudoconocardium parrishi (Worthen) in Hoare, Sturgeon & Kindt 1978 non Conocardium parrishi Worthen 1890]
* Type species of genus indicated

References:
Wagner [no date]
Engeser and Riedel 1997
Hoare, R. D., R. H. Mapes & T. E. Yancey. 2002. Structure, taxonomy, and epifauna of Pennsylvanian rostroconchs (Mollusca). Journal of Paleontology 76 (Suppl.): 1-30.
Hoare, R. D., & L. P. Plas Jr. 2003. Permian rostroconchs (Mollusca) from Nevada. Journal of Paleontology 77 (5): 873-875.
Prothero, D. R. 1998. Bringing Fossils to Life: An introduction to paleobiology. WCB McGraw-Hill: Boston.