A distinctive long-spined Inaniguttid dominated radiolarian fauna is present in cherts of the Kekesayi terrane in west Junggar, Xinjiang Province, China. This fauna contains moderately well preserved specimens of Protoceratoikiscum clarksoni on which the presence of caveal ribs and patagial tissue can be observed. Characteristics of the fauna are similar to others of correlative late Middle Ordovician (Llandeilan) age known from Scotland (U.K.) suggesting that Protoceratoikiscum clarksoni may be biostratigraphically useful.

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