About 1/2", on Urosalpinx cinerea (Eastern Oyster Drill).
On dock; this view is from above looking down into the water.
when i flipped the rock i thought i had found my first Missouri snake the way it slithered fast to escape, when i grabbed it i discovered it was a worm and thought it was just a big night crawler till it was suggested due to the way it acted and the sheen on it that it could be Amynthas agrestis
The annelids (also called "ringed worms"), formally called Annelida (from Latin anellus "little ring"), are a large phylum of segmented worms, with over 2,000 modern species including ragworms, earthworms and leeches. They are found in marine environments from tidal zones to hydrothermal vents, in freshwater, and in moist terrestrial environments.They are bilaterally symmetrical, triploblastic, coelomate organisms.They have parapodia for locomotion. Although most textbooks still use the traditional division into polychaetes (almost all marine), oligochaetes (which include...