Marine environment. What species is this?
Saltwater diatom. Possibly Ditylum brightwellii
Saltwater, has a silica skeleton . What species is this?
While walking on the beach near Port Aransas, I observed the ever-present Sargassum Seaweed, Sargassum fluitans. There wasn't a whole lot of it on that day.
Sitting on the hand of a six-year old boy (it was big but not quite as big as it looks).