Pencil urchin?

[PeterEde]

2x came on my latest live rock

 

[Jedi1199]

Nice score!!

 

[EricR]

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]

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:

We'll forward you in a second

treatment.plazi.org

**Source:

https://www.ingentaconnect.com/contentone/umrsmas/bullmar/2007/00000081/00000001/art00006?crawler=true

 

[PeterEde]

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)?

I believe most comes from GBR possibly ningalo