Maotianoascus octonarius is an extinct species of stem-group ctenophore, known from the Chinese Maotianshan shales of Yunnan.

The species is remarkable for its set of eight massive lobes.

A phylogenetic study of Cambrian stem-group ctenophores recovered Maotianoascus in Scleroctenophora, along with Galeactena, Thaumactena, Batofasciculus, Gemmactena and Trigoides.

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