
Marine Horseshoe Worm (Phoronopsis californica)
Jahir, Lembeh.
In Wikipedia it mentions only temperate areas but I see links to Indonesia spottings as well;
https://reefguide.org/pixhtml/phoronopsiscalifornica1.html
In this link they even saw it in the same dive site as me. See:
https://www.diverosa.com/categories/Worms.htm

''Phoronopsis californica'' is a species of marine horseshoe worm in the phylum Phoronida. It was first described as a new species by William Hilton in 1930 when he found it at Balboa Bay, California.
Similar species: Not assigned
By Patomarazul
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Uploaded Jul 20, 2018. Captured May 15, 2018 05:50 in Unnamed Road, Kota Bitung, Sulawesi Utara, Indonesia.
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