Hirudinea
noun plural
Hir·u·din·ea
ˌhir-(y)ə-ˈdin-ē-ə 
: a class of hermaphroditic aquatic, terrestrial, or parasitic annelid worms distinguished by a coelom nearly obliterated by connective tissue and reduced to a series of vascular sinuses, by modification of the hindmost segments into a sucking disk, and by the absence of parapodia and setae
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“Hirudinea.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/Hirudinea. Accessed 31 Oct. 2025.
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