Aspiduriellidae, Thuy & Numberger-Thuy & Gale, 2025

Family Aspiduriellidae nov.

Genera included: Aspiduriella Bolette, 1998 and Persoonaster gen. nov.

Diagnosis: Stem euryalids with a round to rounded pentagonal disc covered by conspicuously large, very thick radial shields forming a continuous or at least near-continuous ring encompassing granule-covered primary plates; adoral shields meeting over their entire length; second oral tentacle pores entering mouth slit via shallow embayment; teeth and oral papillae small; arms short and rapidly tapering; lateral arm plates tumid, devoid of outer surface ornamentation except for poorly defined spurs and/or a central depression on proximal edge; spine articulations very small to moderately large, with muscle opening bordered by poorly defined, arched ridge proximally, and by thick lip-shaped vertical ridge distally; distal articulation face of vertebrae with tiny zygosphene between two large, parallel zygocondyles.