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 Pleurosigma species have two or four long and ribbon-like chloroplasts that run along their entire length. Ceratium furca have two horns of different lengths on their lower half and one horn on their top half. Stephanopyxis species are formed in chains of cells that are full of little round chloroplasts. Anabaena species are formed in chains twisted in tight coils resembling a slinky. Ciliates are a group of complex single-cell organisms that have hair-like structures called cilia that they use for movement or feeding. Ceratium tripos long, skinny horns on their lower half that fold over to be almost parallel with their top horn.