Flatworm orders

Cyclophyllidea (the cyclophyllid cestodes) is an order of Cestoda (tapeworm). It is the largest and most diverse order of Cestoda (tapeworm), encompassing species that infect all classes of terrestrial tetrapods including humans and domesticated animals, and includes species with some of the most severe health impact on wildlife, livestock, and humans.

Plagiorchiida is a large order of trematodes, synonymous to Echinostomida. They belong to the Digenea, a large subclass of flukes. This order contains relatively few significant parasites of humans.

Tetraphyllidea is a large tapeworm order that contains some 60 genera and about 800 described species. Tetraphyllideans are remarkable for their scolex morphologies, which are the most varied and morphologically complex amongst all tapeworm orders.

REDIRECT Amphilinidae

Rhabdocoela is an order of flatworms in the class Rhabditophora with about 1700 species described worldwide. The order was first described in 1831 by Christian Gottfried Ehrenberg. Most of rhabdocoels are free-living organisms, but some live symbiotically with other animals.

thumb|Pseudophyllid Pseudophyllid cestodes (former order pseudophyllidea) are tapeworms with multiple "segments" (proglottids) and two bothria or "sucking grooves" as adults. Proglottids are identifiably pseudophyllid as the genital pore and uterine pore are located on the mid-ventral surface, and the ovary is bilobed ("dumbbell-shaped").

The Prolecithophora are an order consisting of an estimated 300 species of small (typically 0.2 – 12 mm, one species up to 50 mm), active, aquatic flatworms. The order lacks a common English name. Most species are shaped like an elongated, stylized droplet, and are opaque white or yellow; they frequently have contrasting bands or spots in colors, such as purple, yellow, red, or brown. They have no to three (normally two) pairs of pigment-cup eyes, and well-developed tactile and chemoreceptor senses. With few exceptions, species are protandric hermaphrodites with internal fertilizatio

Gyrocotylidea is an order of Cestoda (tapeworms). Members of this order are parasites of vertebrates, living in the coelom (the body cavity). Gyrocotylidea are a subspecies of the tapeworm that is mainly a parasite of fishes and turtles. They do not have a gut, thus being classified with Cestodes.

The Caryophyllideans are a group of tapeworms that infect fish and annelids (segmented worms) with a simple scolex or "head." Worms in this order only have one proglottid, which is believed to be the primitive condition for tapeworms. They are generally less than 10 centimetres long. Caryophillideans represent a unique type of tapeworm, such that they possess a monzoic, unsegmented, body, with only a single set of reproductive organs.

Diphyllobothriidea is an order of Cestoda (tapeworms). Members of this order are gut parasites of vertebrates. They infect mammals as their definitive hosts and use either copepods (a group of small crustaceans found in the sea and nearly every freshwater habitat, e.g. Spirometra) or both copepods and fish as in the broadfish tapeworm as intermediate hosts.

Trypanorhyncha is an order of cestodes, a type of flatworm.

Mazocraeidea is an order of flatworms in the subclass Polyopisthocotylea within the class Monogenea.

Diplostomida is an order of trematodes in the subclass Digenea. It is synonymous with Strigeatida Poche, 1926.

Dactylogyridea is an order of parasitic flatworms in the class Monogenea.

Bothriocephalidea is an order of Cestoda (tapeworms). Members of this order are gut parasites of vertebrates.

The Lecithoepitheliata are an order of rhabditophoran flatworms. They are free-living worms, found in freshwater, soil, and marine environments. However, it is still poorly known their roles in the natural food web.

Onchoproteocephalidea is an order of flatworms belonging to the class Cestoda.

Gyrodactylidea is an order of monogenean parasitic flatworms in the subclass Monopisthocotylea.