Trochus sp?

[razorskiss]

I got these from an LFS described as a Trochus species, but looking online I couldn't find any Trochus specimen with a shell like this. They're diligent little buggers, infinitely more productive than my astreas and I want more of them!

 

[WheatToast]

Lithopoma phoebium (once known as Astraea phoebia) and other similar species, the ninja star snail or spiny star Astrea. These are fairly common film/hair algae grazers in the trade that, unlike Trochus snail but similarly to Astrea snails, cannot right themselves if they are knocked over:
https://m.liveaquaria.com/product/2844/?pcatid=2844
https://www.saltybottomreefcompany.com/NinjaStarSnail?amp=1

 

[razorskiss]

Thanks! I have a pair of more common cone shaped astrea too, but these guys never fall over and are cleaning machines while the other fall over at least once a day and barely clean