Heteroschisma canadense, photographed by Dave.

Belongs within: Blastoidea.

The Codasteridae are a Devonian to Permian group of blastoids with eight hydrospire fields.

Characters (from Beaver et al. 1967): Theca with eight exposed or constricted hydrospire fields; hydrospire slits lacking on anal side.

<==Codasteridae [Angioblastidae]
    |--Emuhablastus Waters, Maples et al. 2003 WM03
    |    `--*E. planus Waters, Maples et al. 2003 WM03
    |--Heteroschisma Wachsmuth 1883 BF67
    |    |--*H. gracile Wachsmuth 1883 [incl. Trionoblastus Fay 1961] BF67
    |    |--H. canadense BF67
    |    |--H. pyramidatus BF67
    |    `--H. subtruncatus (Hall 1858) [=Pentremites subtruncatus, *Trionoblastus subtruncatus] BF67
    `--+--Codaster M’Coy 1849 BF67
       |    `--*C. acutus M’Coy 1849 BF67
       `--+--Tympanoblastus WM03
          |--Angioblastus Wanner 1931 BF67
          |    `--*A. variabilis Wanner 1931 BF67
          |--Nannoblastus Wanner 1924 BF67
          |    `--*N. pyramidatus Wanner 1924 BF67
          |--Agmoblastus Fay 1961 BF67
          |    `--*A. dotti (Moore & Strimple 1942) [=Paracodaster dotti] BF67
          |--Indoblastus Wanner 1924 BF67
          |    `--*I. granulatus Wanner 1924 BF67
          |--Pterotoblastus Wanner 1924 BF67
          |    `--*P. gracilis Wanner 1924 BF67
          |--Sagittoblastus Yakovlev 1937 BF67
          |    `--*S. wanneri (Yakovlev 1926) [=Timoroblastus wanneri] BF67
          `--Paracodaster Yakovlev 1940 BF67
               `--*P. miloradovitschi Yakovlev 1940 BF67

*Type species of generic name indicated


[BF67] Beaver, H. H., R. O. Fay, D. B. Macurda Jr, R. C. Moore & J. Wanner. 1967. Blastoids. In Treatise on Invertebrate Paleontology pt. S. Echinodermata 1. General characters. Homalozoa-Crinozoa (except Crinoidea) (R. C. Moore, ed.) vol. 2 pp. S297-S455. The Geological Society of America, Inc., and The University of Kansas: Lawrence (Kansas).

[WM03] Waters, J. A., C. G. Maples, N. G. Lane, S. Marcus, Liao Z.-T., Liu L., Hou H.-F. & Wang J.-X. 2003. A quadrupling of Famennian pelmatozoan diversity: New Late Devonian blastoids and crinoids from northwest China. Journal of Paleontology 77 (5): 922-948.

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