Turbellaria

The Turbellaria are one of the traditional sub-divisions of the phylum Platyhelminthes (flatworms), and include all the sub-groups that are not exclusively parasitic. There are about 4,500 species, which range from to large freshwater forms more than long or terrestrial species like Bipalium kewense which can reach in length. All the larger forms are flat with ribbon-like or leaf-like shapes, since their lack of respiratory and circulatory systems means that they have to rely on diffusion for internal transport of metabolites. However, many of the smaller forms are round in cross section. Most

The Polycladida represents a highly diverse clade of free-living marine flatworms. They are known from the littoral to the sublittoral zone (extending to the deep hot vents), and many species are common from coral reefs. Only a few species are found in freshwater habitats.

Catenulida is an order of flatworms in the classical classification, or a class of flatworms in a phylogenetic approach. They are relatively small free-living flatworms, inhabiting freshwater and marine environments. There are about 100 species described worldwide, but the simple anatomy makes species distinction problematic.

Pseudocerotidae is a family of flatworms which includes the Bedford's flatworm. Pseudocerotidae are simple organisms categorized by their oval bodies and tentacles and bright colors. They use the cilia to glide along surfaces. Most commonly referred to as marine flatworms, closely related to the orders Macrostomorpha and Lecithoepitheliata. These organisms have very complex reproductive systems, no blood systems or organs for gas exchange, a simple brain and are hermaphroditic.

Euryleptidae is a family of marine polyclad flatworms.

The Seriata are an order of turbellarian flatworms.

The Microstomidae are a family of small basal free-living flatworms (Macrostomida, Rhabditophora, Platyhelminthes), and members of the marine, brackish, freshwater meiobenthos and plankton. There are currently about 40 named species in this family.

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

species of worm

species of worm

Acotylea is a suborder of free-living marine turbellarian flatworms in the order Polycladida.

suborder of worms

species of worm

Cryptocelidae is a family of flatworms.

species of worm

species of worm

Monocelididae is family of marine turbellarian flatworms in the order Proseriata, sub order Lithophora.

species of worm

species of worm

Stylochidae is a family of polyclad flatworms. It includes the species Stylochus zebra, which usually lives in shells occupied by the hermit crab Pagurus pollicaris, though it can sometimes be found free living on rocks and pilings.

Neoophora is a group of rhabditophoran flatworms with ectolecithal eggs, i.e., yolk is not present in the egg as in most animals, but rather is secreted by accessory glands called vitellaria or yolk glands. These glands have the same embryonic origin as the ovaries, but usually constitute a separate organ in adult animals.

Polyposthiidae is a family of flatworms belonging to the order Acotylea.

Prosthiostomidae is a family of free-living marine polyclad flatworms in the suborder Cotylea.

species of worm

Dolichomacrostomidae is a family of small basal free-living flatworms of the clade Macrostomorpha. There are currently about 40 named species in this family.

species of worm

species of worm

The Temnocephalida are an order of turbellarian flatworms.

species of worm

Pseudostomum is a genus of flatworms in the family Pseudostomidae.

species of worm

Notoplanidae is family of free-living marine turbellarian flatworms in the order Polycladida.

species of worm

species of worm

species of worm

species of worm