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THE ANIMAL KINGDOM
Phylum Platyhelminthes

The Platyhelminthes, Class Level Index Go Down Go Back
Phylum Platyhelminthes:
This phylum consists of over 25,000 species of flat worms which have a bilaterally symmetrical body having 3 layers of tissues with organs and organelles, These species have a body contains no internal cavity; possesses a blind gut (i.e. it has a mouth but no anus); gas Protonephridial excretory organs instead of an anus; has normally a nervous system of longitudinal fibres rather than a net; generally dorsoventrally flattened; reproduction mostly sexual as hermaphrodites; feed on animals and other smaller life forms; species occur in all major habitats, including many as parasites of other animals

Taxonomy:
Kingdom: Animalia
Phylum: Platyhelminthes
Superclass: Neodermata

Class: Cestoda
Includes: tapeworms, parasitic which live in digestive track of host, including humans
Orders: Bothriocephalidea
Orders: Caryophyllidea
Orders: Cathetocephalidea
Orders: Cyclophyllidea
Orders: Diphyllobothriidea
Orders: Diphyllidea
Orders: Haplobothriidea
Orders: Lecanicephalidea
Orders: Litobothriidea
Orders: Onchoproteocephalidea
Orders: Phyllobothriiea
Orders: Proteocephalidea
Orders: Rhinebothriidea
Orders: Spathebothriidea
Orders: Tetrabothriidea
Orders: Tetraphyllidea
Orders: Trypanorhyncha

Class: Monogenea
Includes: flukes, parasitic on single host, usually fish
Orders: Capsalidea
Orders: Dactylogyridea
Orders: Gyrodactylikea
Orders: Monocotylidea
Orders: Montchadskyellidea
Orders: Mazocraeidea
Orders: Polystomatidea
Orders: Chimaericolidea
Orders: Diclybothriidea

Class: Trematoda
Includes: flukes, parasitic with oral suckers,
some have life cycles involving two or more hosts including humans
Subclass: Aspidogastra
Order: Aspidogastrida
Order: Stichocotylida
Subclass: Digenea
Order: Diplostomida
Order: Plagiorchiida

Class: Turbellaria (3000 species)
Includes: free living, carnivorous, primarily aquatic worms.
Orders: Acels
Orders: Allocoels
Orders: Catenulida
Orders: Kalyptorhynchia
Orders: Macrostomida
Orders: Neorhabdocoela
Orders: Polycladida
Orders: Prolecithophora
Orders: Proseriata
Orders: Tricladida

Conservation Status
EX Extinct
EW Extinct in the Wild
CR Critically Endangered
EN Endangered
VU Vulnerable
NT Near Threatened
CD Conservation Dependent
LC Least Concern
NL Not Listed

1  
The number of species as listed is approximate as new species continue to be found. Some estimates of extant species are much higher.

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This Page Last Updated: 31 May 2026


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by Thom Buras
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