pan id="xref-ref-3-1" class="xref-bibr">Chen and Yao (1993)pan> described diverse echinoderm communities from Ordovician through Upper Carboniferous rocks in western Yunnan, China—the first monographic treatment of Chinese echinoderms in almost 70 years. This paper is the first in a series of studies re-describing echinoderm taxa from these biogeographically important Paleozoic assemblages. Pentremites globosus pan id="xref-ref-3-2" class="xref-bibr">Chen and Yao, 1993pan> is designated as the type species of Sinorbitremites, a new genus of orbitremitid blastoids. Pentremites ovatus pan id="xref-ref-3-3" class="xref-bibr">Chen and Yao, 1993pan> is placed in synonymy with Sinorbitremites globosus (pan id="xref-ref-3-4" class="xref-bibr">Chen and Yao, 1993pan>). Cryptoschisma conicum has been reassigned to Breimeriblastus, a hyperoblastid blastoid.
