What Type Shells are These?

[JtheFishMan]

I have five red legged hermit crabs, and they are all thriving and eating well. It’s at least one molt in the tank every week. One of my hermit crabs recently switched shells into this one. This is the largest type shell I have in my tank at the moment.

Does anyone know specifically what type shell this is? I can get some more for the rest of my hermits in case they need larger shells.

 

[Gtinnel]

Astrea perhaps.

 

[JtheFishMan]

Astrea perhaps.

These definitely look like Astrea shells!

 

[strawberryfish]

If you want more specificity you can reference this wiki page on the Turbinidae family of Gastrapoda. https://en.wikipedia.org/wiki/Turbinidae
Or this page on the Astrea Genus of snails.
https://en.wikipedia.org/wiki/Astraea_(gastropod)
Looks like Cookia Sulcata to me but hard to be sure.
https://en.wikipedia.org/wiki/Cookia_sulcata

 

[TheBear78]

It looks like an Astrea. I have a couple of hermits that came in those shells (clibanarius hermit, IIRC). Both have since moved house twice now and currently reside in shells that I picked up from a beach near me, after ensuring that they were empty and boiled in clean saltwater (see below)
I have a couple of Halloween hermits too but it is much harder to find new shells for them.

 

[encrustingacro]

That snail shell looks like lithopoma, commonly misidentifed as astraea. True astraea shells look like this:

 

[JtheFishMan]

I got another answer that said it looks like a Trochus snail shell. Thoughts?

 

[Sharkbait19]

They are very similar species, but I’m still seeing an astrea.
Nassarius shells also make really good homes.