San Diego County, California, US
The second and third photos are pictures of the habitat where this Truncatella was found.
The second picture shows two specimens of this species among the detritus covering these aggregating anemones on rocks in the intertidal. One is in center right of the photo, the other is center left.
dead shell attached to aggregating anemones
No idea what this is. Had a 1/3" diameter tube, fairly hard, but rather than "feathers" at the top it had this - head. Which periodically reached out and grabbed some of the surrounding algae, then withdrew. Never extended further than this. If not a polychaete, is is a mollusc of some sort?
My wife got shells on beach in July and noticed one of them is living when we get back to home! I put it to salt water tank. We found it was moving in the tank.
The Neotaenioglossa is an taxonomic name for a large group of mostly sea snails. The name was originally created by Haller in 1882. Ponder and Warén (1988), and Marquet (1997), assigned this name to the superorder Caenogastropoda. ITIS considers the order Neotaenioglossa to be a synonym of Cerithioidea Férussac, 1819 .