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Terebellidae g. sp.
Terebellidae is a family of polychaete worms. They are surface deposit feeders, catching falling particles with numerous elongate prostomial tentacles splayed out on the sea floor. These tentacles, which are the most or only normally visible portion of the animal and are reminiscent of spaghetti, inspired the common name spaghetti worms. The remainder of the animal is in a semi-permanent burrow or permanent tube in soft substrates. Most terebellids live in burrows or crevices and are often of large size, ranging up to 150 millimetres in length and 15 millimetres in width. The numerous, very long tentacles which radiate from near the mouth are used for finding and collecting food particles from the sediment surface. The tentacles are not retractable as is the case in the ampharetids. They have plump anterior bodies and numerous segments in their long, tapered posterior bodies, whereas ampharetids are more compact. They have branched gills laterally on up to three anterior chaetigers but in the subfamily Thelepodinae the gills are numerous simple filaments. The mid-body chaetigers are in double rows in the subfamily Amphitritinae. In the subfamily Polycirrinae, the gills are absent and the prostomium is expanded as an undulating membrane which bears the tentacles.
This creature was found in/encrusted to a whelk shell that was collected during a sampling of sea grass beds off of Marathon Key. The photos were taken in a wet lab. Over the course of its stay in the wet lab, before we released it, it had managed to collect enough debris to create a new "tube home"