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Heterotrophic members of the marine plankton dinoflagellate genus Dinophysis are specialized predators, whose food includes the prostomatid ciliate Tiarina fusus. This ciliate differs from most planktonic ciliates in its ability to ingest prey of its own size including autotrophic Dinophysis spp. However, when trying to catch a heterotrophic Dinophy- sis sp., the ciliate is trapped instead by the dinoflagellate and emptied via a feeding tube (peduncle), which originates from the flagellar pore of the dinoflagellate. The specific predation on a ciliate by a heterotrophic dinoflagellate represents a new trophic link in the marine planktonic food web. The existence of colourl.ess thecate dinoflagellates in the marine pelagial has been recognized among taxo- nomists for more than a century (Gaines & Elbrachter 1987). In spite of this, few ecological studies dealing with the marine planktonic food webs have included them in the protozoan plankton even though they may make up a substantial part of the biomass of this group (Smetacek 1981). Knowledge about their trophic role in the marine pelagial has simply been too poor. Recent studies have revealed that a number of colourless thecate species belonging to the genera Protoperidinium, Oblea and Zygabikodinium are able to feed on large diatoms and dinoflagellates by a pseudopodium, a 'feeding veil' or a 'pallium', which encloses the prey (Gaines & Taylor 1984, Jacobson & Anderson 1986). The species studied so far all belong to the order Peridinales. The purpose of this work has been to study the trophic role and feeding mechanism of colourless species belonging to the order Dinophysiales. Materials and Methods. Samples of surface water were collected from a permanent station in the southern part of Kattegat (56' 15.42E, 12' 00.12N), Denmark, during 1989. The plankton was concentrated (net mesh size 20 pm) and incubated in 65 m1 tissue culture flasks

Dinophysis - a planktonic dinoflagellate genus which can act both as a prey and a predator of a ciliate