In most primitive groups, that belong to lower Diptera (Nematocera and Orthorrhapha), the mouthparts are composed of three median and unpaired appendages and two pairs of symmetrical appendages. Diet and functional feeding groups of Chironomidae (Diptera) in the Middle Paraná River floodplain (Argentina) Dieta y grupos funcionales tróficos de Chironomidae (Diptera) de la llanura aluvial del río Paraná Medio (Argentina) M. Celeste Galizzi I; Florencia Zilli II; Mercedes Marchese I,II Diet and functional feeding groups of Chironomidae (Diptera) in the Middle Paraná River oodplain (Argentina) M. Celeste Galizzi 1 , Florencia Zilli 2 & Mercedes Marchese 1,2 Keywords: Functional feeding groups, ... and Diptera were the most represented families in the study area. Different streams will have different balances of these functional feeding groups, which can Functional Feeding Groups and the River Continuum In discussing families of insects in previous entries I've mentioned the phrase "Functional Feeding Group" (FFG) on more than one occasion. Feeding Group - Predator: Notes - The tolerance value and functional feeding group are quoted for Hexatoma. The four major functional groups are: Collectors (filtering and gathering) – This group includes organisms that filter small particulate organic matter from the water column. Representatives of every functional feeding group have been reported among the aquatic dipterans. structural and functional involvement of clypeolabral region in the mouthparts; development of the hypopharynx. Predator mainly Odonata, Hemiptera and Coleoptera was the most common group and found in high densities in Bogak River (modified river) and Kerian River (main river). A functional feeding group refers to the type of food resource that a particular species utilizes in the stream. Identification to family or subfamily enables the investigator to specify more precisely their position in food webs. The same general behavioral mechanisms in different species can result in the ingestion of a wide range of food items. Functional feeding groups are a classification approach that is based on behavioral mechanisms of food acquisition rather than taxonomic group. station title = {Diet and functional feeding groups of Chironomidae (Diptera) in the Middle Paraná River floodplain (Argentina)}, journal = {Iheringia. Functional feeding groups Different taxa perform different functions in aquatic systems. Table 2: Functional feeding groups of macroinvertebrates in Zarin-Gol River. Série Zoologia}, They burrow into sediments where they sprawl and cling. For example, shredders break down leaves that fall into streams while scrapers use primary production. 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