Order Neogastropoda Family Turbinellidae Hystrivasum shrinerae (Hollister, 1971) Stratigraphy: Pinecrest Sand Member of the Tamiami Formation Location:  APAC, Sarasota County, Florida USA. Status: Extinct   Notes:  Separated from other Hystrivasum species by the presence of 6 body chords.  More common in the Kissimmee River Valley, but very rare at Sarasota.