Abstract
Two new kirkocystid mitrate stylophorans (Echinodermata, Homalozoa) and a new possible solute (Echinodermata, Homalozoa) are described from the Early Ordovician of the western United States. The mitrates are among the earliest members of their clade to appear near the beginning of the Ordovician Radiation.Anatifopsis ninemilensisnew species comes from the Ninemile Shale in central Nevada and the McKelligon Canyon Formation in west Texas.Anatifopsis fillmorensisnew species comes from the middle Fillmore Formation in western Utah and a Ninemile Shale equivalent limestone bed in southern Nevada. The possible soluteDrepanocystis dubiusnew genus new species from the lower Wah Wah Limestone in western Utah, shows unusual morphology with an elongate theca and a long arm shaped like a sickle.
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