Flatworms

Platyhelminthes () is a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates commonly called flatworms or flat worms. Being acoelomates (having no body cavity), and having no specialised circulatory and respiratory organs, they are restricted to having flattened shapes that allow oxygen and nutrients to pass through their bodies by diffusion. The digestive cavity has only one opening for both ingestion (intake of nutrients) and egestion (removal of undigested wastes); as a result, the food can not be processed continuously.

Catatropis is a genus of trematodes belonging to the family Notocotylidae.

Mesocestoides is a genus of flatworms belonging to the family Mesocestoididae.

Nematoplanidae is a family of flatworms belonging to the order Proseriata.

Cicerinidae is a family of flatworms belonging to the order Rhabdocoela.

Prosthogonimus is a genus of trematodes belonging to the family Prosthogonimidae.

Otoplanidae is a family of flatworms belonging to the order Proseriata.

Bunodera is a genus of flatworms belonging to the family Allocreadiidae.

Ilyplanidae is a family of flatworms belonging to the order Polycladida.

Cylindrostomidae is a family of flatworms belonging to the order Prolecithophora.

Coelogynoporidae is a family of flatworms belonging to the order Proseriata.

Posthodiplostomum is a genus of flatworms belonging to the family Diplostomidae.

Monocelis is a genus of flatworms belonging to the family Monocelididae.

Phyllodistomum is a genus of flatworms belonging to the family Gorgoderidae.

Multipeniata is a genus of flatworms in the order Prolecithophora. It is the only genus in the monotypic family Multipeniatidae.

Callioplanidae is a family of flatworms belonging to the order Polycladida.

Graffillidae is a family of flatworms belonging to the order Rhabdocoela.

Geocentrophora is a genus of flatworms belonging to the family Prorhynchidae.

species of worm

Nippotaeniidae is a family of flatworms belonging to the order Nippotaeniidea.

Azygia is a genus of flatworms belonging to the family Azygiidae.

Scutariellidae is a family of flatworms belonging to the order Rhabdocoela.

Provorticidae is a family of flatworms belonging to the order Rhabdocoela.

Tetracotyle is a genus of flatworms belonging to the family Strigeidae.

Prorhynchus is a genus of flatworms belonging to the family Prorhynchidae.

Micropharynx is a genus of planarian placed incertae sedis in the suborder Maricola.

Castrella is a genus of flatworms belonging to the family Dalyelliidae.

species of worm

Limnostylochidae is a family of flatworms belonging to the order Polycladida.

Gieysztoria is a genus of Platyhelminthes belonging to the family Dalyelliidae, and within this family it is the genus with the highest numbers of species (approximately 75 species) and the widest distribution.''''

Provortex is a genus of flatworms belonging to the family Provorticidae.

Pleioplanidae is a family of flatworms belonging to the order Polycladida.

Temnocephalidae is a family of flatworms belonging to the order Rhabdocoela, and was first described in 2021 by Van Steenkiste, Rivlin, Kahn, Wakeman & Leander.

Euplanidae is a family of flatworms belonging to the order Polycladida.

Phaenocora is a genus of flatworms belonging to the family Typhloplanidae.

Baicalellia is a genus of flatworms belonging to the family Provorticidae.

Microstomum is a genus of flatworms in the family Microstomidae.

Strongylostoma is a genus of flatworms belonging to the family Typhloplanidae.

Renicola is a genus of flatworms belonging to the family Renicolidae.

Acrobothriidae is a family of flatworms belonging to the order Spathebothriidea.

Caryophyllaeus is a genus of flatworms belonging to the family Caryophyllaeidae.

Amyellidae is a family of flatworms belonging to the order Polycladida.

Hapalotrema is a genus of trematodes belonging to the family Spirorchiidae.

Microdalyellia is a genus of flatworms belonging to the family Dalyelliidae.

Azygiida is an order of flatworms belonging to the class Rhabditophora.

Apidioplana is a genus of flatworm belonging to the monotypic family Apidioplanidae.

Apatemon is a genus of flatworms belonging to the family Strigeidae.

Didangia is a genus of flatworms belonging to the order Polycladida. It is the only genus in the monotypic family Didangiidae.

Neodiplostomum is a genus of flatworms belonging to the family Diplostomidae.

species of worm

Elongoparorchis is a genus of flatworms belonging to the family Dictysarcidae.

Diorchis is a genus of flatworms belonging to the family Hymenolepididae.

Echinophallidae is a family of flatworms belonging to the order Bothriocephalidea.

Otomesostomatidae is a family of flatworms belonging to the order Proseriata.

juvenile form of some flatworms

Diposthidae is a family of flatworms belonging to the order Polycladida.

Acoleidae is a family of flatworms belonging to the order Cyclophyllidea.

Archimonocelididae is a family of flatworms belonging to the order Proseriata.

Megaperidae is a family of flatworms belonging to the order Plagiorchiida.