A MORPHING MARINE WORM
A thalassematid echiuran from Madang, Papua New Guinea, an odd animal that constantly changes its shape, is “never the same” … these 6 photos show the same individual.
Echiura - spoon worms - a class of marine Annelid worms.
Thalassematinae is a subfamily of spoon worms.
The Echiuran worms are an exclusively marine/brackish water group of round, unsegmented worms with a short, stout trunk and and a proboscis that can be shortened and lengthened (but not retracted). The proboscis has a broad groove beneath, with the mouth at its base. Many echiurans are quite large.
Read more in the Encyclopedia of Life