I think this is Amphiporus bimaculatus, but I did not get a look at the underside of its head to confirm the presence of the two triangular dark spots next to its mouth.
Common Name: Ribbon Worm, Event #: MOOCUBE_01, Specimen #: XMOO_4003, Notes: Phylum Nemertea, Location: UC Berkeley Gump Station, Moorea, French Polynesia
I love the name of this Orange Ribbon Worm, Tubulanus polymorphus , because it truly is polymorphus. In this case, I gently pulled it a little bit out of its hole, and its form completely changed. This is only the second time I've seen one of these.
Nemertea is a phylum of invertebrate animals also known as "ribbon worms" or "proboscis worms". Alternative names for the phylum have included Nemertini, Nemertinea and Rhynchocoela. Although most are less than 20 centimetres (7.9 in) long, one specimen has been estimated at 54 metres (177 ft), which would make it the longest animal ever found. Most are very slim, usually only a few millimeters wide, although a few have relatively short but wide bodies. Many have patterns of...