Matching Pairs Phytoplankton IdentificationOnline version Using LUMOCON's Phytoplankton Guide (https://phytoplanktonguide.lumcon.edu/), can you identify these phytoplankton ? by Rebecca Frowine 1 2 3 4 5 6 Ceratium tripos long, skinny horns on their lower half that fold over to be almost parallel with their top horn. Pleurosigma species have two or four long and ribbon-like chloroplasts that run along their entire length. Anabaena species are formed in chains twisted in tight coils resembling a slinky. Stephanopyxis species are formed in chains of cells that are full of little round chloroplasts. Ciliates are a group of complex single-cell organisms that have hair-like structures called cilia that they use for movement or feeding. Ceratium furca have two horns of different lengths on their lower half and one horn on their top half.