Tricladida
noun plural
Tri·clad·i·da
ˌtrī-ˈklad-əd-ə 
: an order of small turbellarian worms (as the planarians) including marine, freshwater, and terrestrial forms
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“Tricladida.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/Tricladida. Accessed 31 Oct. 2025.
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