Pencil urchin?

PeterEde

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2x came on my latest live rock

20231104_221218.jpg
 

EricR

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Looks cool!
Species ID isn't my thing but looks like "some kind" of pencil urchin to me.
Where did your live rock come from? ...somewhere in Australia (I assume)?
 

ISpeakForTheSeas

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Black/Oblong Rock-boring Urchin - Echinometra oblonga; it could also be the Burrowing Urchin, E. mathaei, as the two are similar enough that E. oblonga was once considered a morph of E. mathaei,* but - based on the coloration of your specimen - E. oblonga seems more likely to me.

Either way, both species primarily reside in the rocks and primarily feed on turf algae of various kinds** - so a good herbivore for your tank.

*Source:
**Source:
 

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