Theelia

Sclerites of Theelia undulata, from Frizzell & Exline (1966).

Belongs within: Apodida.

Theelia is a genus of wheel sclerites known from the Triassic (possibly the Late Carboniferous) to the Pleistocene (Frizzell & Exline 1966).

Characters (from Frizzell & Exline 1966): Spokes 6–10; rim inclined to plane of wheel, curving upward and inward, denticulate on inner margin, teeth not extending to periphery as seen from above; center imperforate, typically with hemispherical or conical tubercle or button.

<==Theelia Schlumberger 1891 [incl. Chiridotites Deflandre-Rigaud 1949] FE66
    |--*T. undulata (Schlumberger 1888) [=Chirodota undulata] FE66
    |--T. agariciformis FE66
    |--T. angulata FE66
    |--T. atava FE66
    |--T. clavata FE66
    |--T. convexa FE66
    |--T. crassidentata FE66
    |--T. curriculum FE66
    |--T. deflandreae FE66
    |--T. eisenstadtensis FE66
    |--T. florealis FE66
    |--T. florida FE66
    |--T. guembeli FE66
    |--T. heptalampra FE66
    |--T. hexaneme FE66
    |--T. ingens FE66
    |--T. lanceolata FE66
    |--T. mortenseni FE66
    |--T. muellendorfensis FE66
    |--T. petasiformis FE66
    |--T. pralongiae FE66
    |--T. quinquelobata FE66
    |--T. rara FE66
    |--T. rigaudae FE66
    |--T. rosetta FE66
    |--T. rotula FE66
    |--T. sinaiensis FE66
    |--T. speciosa FE66
    |--T. tubercula FE66
    |--T. venusta FE66
    |--T. vetusta FE66
    `--T. wessexensis FE66

*Type species of generic name indicated

REFERENCES

[FE66] Frizzell, D. L., & H. Exline. 1966. Holothuroidea—fossil record. In: Moore, R. C. (ed.) Treatise on invertebrate Paleontology pt U. Echinodermata 3 vol. 2 pp. U646–U672. The Geological Society of America, Inc., and The University of Kansas Press.