Tyler, Seth Department of Zoology, University of Maine, Orono, Maine.
- Gut and feeding
- Body wall
- Nervous system and sensory organs
- Circulation and excretion
- Sexual reproduction
- Asexual reproduction
- Links to Primary Literature
- Additional Readings
A taxon of turbellarian platyhelminth worms that are characterized by a three-branched gut and a tubular, protrusible pharynx. The Tricladida (“tri-” = three; “clad” = branch) have elongate bodies and heads that are often shaped distinctively, with small earlike projections or a spatula-like broadening. These worms are common in freshwater habitats (Fig. 1), including springs, streams, and rivers, and they also are found in marine and moist terrestrial habitats (Fig. 2). See also: Platyhelminthes; Turbellaria
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