Twenty-three nearly complete specimens and many broken parts of Archaeophiomusium bispinosum n.sp., and two specimens of A. burrisi (Miller), were collected from the Leonardian Pequop Formation in the Maverick Springs Range, eastern Nevada. Preservation is exceptional, for many nearly complete jaw structures can be seen on exposed oral surfaces; some retain the teeth in place. Spines are preserved on the arms of almost every specimen. Tentacle pores are preserved on the oral side of the arms, two pores per segment; tentacle scales still cover the pores on some segments. A. bispinosum has an aboral disk plate arrangement similar to that in A. burrisi, and in addition bears a series of smaller secondary interradial plates inserted between the main plates.

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