Haimea caillaudi, from here.

Belongs within: Irregularia.

The Oligopygidae are a group of smaller irregular echinoids known from the Upper Cretaceous to the Oligocene (Wagner & Durham 1966).

Characters (from Wagner & Durham 1966): Small to medium-sized; periproct small; without oral funnel; auricles partially recumbent.

<==Oligopygidae [Oligopyginae, Oligopygoida]WD66
    |--Bonaireaster Pijpers 1933WD66
    |    `--*B. rutteni Pijpers 1933WD66
    |--Microlampas Cotteau 1889 [=Microsoma Cotteau 1887 non Cotteau 1886]WD66
    |    `--*M. conicus (Cotteau 1887) [=*Microsoma conicum]WD66
    |--Ovulechinus Lambert 1918WD66
    |    `--*O. pilula Lambert 1918WD66
    |--Protolampas Lambert 1918WD66
    |    `--*P. arnaudi (Cotteau 1891) [=Echinolampas arnaudi]WD66
    |--Haimea Michelin 1851 [incl. Pauropygus Arnold & Clark 1927]WD66
    |    |--*H. caillaudi Michelin 1851WD66
    |    `--*Pauropygus’ platypetalus Arnold & Clark 1927WD66
    `--Oligopygus de Loriol 1887WD66
         |--*O. wetherbyi de Loriol 1887WD66
         |--O. haldemani (Conrad 1850)SG93
         `--O. phelani Kier 1967SG93

*Type species of generic name indicated


[SG93] Simms, M. J., A. S. Gale, P. Gilliland, E. P. F. Rose & G. D. Sevastopulo. 1993. Echinodermata. In: Benton, M. J. (ed.) The Fossil Record 2 pp. 491–528. Chapman & Hall: London.

[WD66] Wagner, C. D., & J. W. Durham. 1966. Holectypoids. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt U. Echinodermata 3 vol. 2 pp. U440–U450. The Geological Society of America, Inc., and The University of Kansas Press.

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