Yellow Water Lily
Nuphar advena
Size: to 9" (leaves)
Habitat: rooted in muddy bottoms with leaves floating at the surface
Yellow is the most common color, but you may also find white and pink.
Squilla empusa is a species of mantis shrimp found in areas of the western Atlantic Ocean from the Gulf of Mexico to Cape Cod, from the intertidal zone down to about 500 ft. It excavates and occupies a deep U-shaped burrow in soft sediment, from which it emerges, mainly at night, to feed on fish and invertebrate prey. They grow to a length of 12", although I have only ever seen small ones in the bellies of striped bass.
More: Mantis Shrimp ...