Platyhelminthes (Flatworms)

Platyhelminthes (Flatworms), derive their name from the Greek πλατύ, platy, meaning “flat” and ἕλμινς (root: ἑλμινθ-), helminth-, meaning “worm”) are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates. Unlike other bilaterians, they have no body cavity, and have no specialized circulatory and respiratory organs, which restricts them 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 cannot be processed continuously.

Platyhelminthes are divided into Turbellaria, which are mostly non-parasitic animals such as planarians, and three entirely parasitic groups: Cestoda, Trematoda and Monogenea. However, since turbellarians have since been proven not to be monophyletic, this classification is now deprecated. Free-living flatworms are mostly predators, and live in water or in shaded, humid terrestrial environments, such as leaf litter. In this section, the group of interest are the terrestrial (Land) Planarians such as members of the genus Anisorhynchodemus, Diversibipalium, and Platydemus which are mainly predators of mollusks and insects.

Source: Wikipedia

Family Geoplanidae (Land Planarians)

Subfamily Bipaliinae (Hammerhead Worms)

Subfamily Geoplaninae (Neotropical Land Planarians)

Subfamily Rhynchodeminae

Tribe Rhynchodemini