Big orange flatworm

[Ghost25]

Saw this guy crawling around my rocks at night. Surprisingly rigid body almost like orange peel stiffness and the same color.

I think it might be a flat worm but maybe it's a nudibranch. I've seen some damage to some of my hard corals lately like my cyphastria and wondering if he's the culprit.

 

[LegendaryCG]

Looks like a vermillion flatworm to me

 

[Ghost25]

Looks like a vermillion flatworm to me

It doesn't appear to have white dots on the upper surface like this website mentions. http://www.wildsingapore.com/wildfacts/worm/polycladida/baibaiye.htm

Additionally the vermillion flatworm appears to be native to southeast Asia although I can't find good distribution data. My live rock came from Florida and that's almost certainly where this hitchhiker came from as well.

Here's a better picture.

 

[Reefer Reboot]

Pictures show gills and rhinophores which would indicate nudibranch or sea slug. Perhaps Doriopsilla pharpa or Doriopsilla espinosai.

​

 

[Ghost25]

Pictures show gills and rhinophores which would indicate nudibranch or sea slug. Perhaps Doriopsilla pharpa or Doriopsilla espinosai.

​

Thanks! Doriopsilla sp. Looks like a good fit. It seems like many of them are sponge eaters. not the worst thing in the world but I think I'll remove it anyway.

 

[Ghost25]

Pictures show gills and rhinophores which would indicate nudibranch or sea slug. Perhaps Doriopsilla pharpa or Doriopsilla espinosai.

​

Thanks! Doriopsilla sp. Looks like a good fit. It seems like many of them are sponge eaters. not the worst thing in the world but I think I'll remove it anyway.