Hirudo

[ hĭ-rōō′dō ]

A genus of leeches that includes the species most commonly used in medicine.

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OK Boomer can be perceived as pejorative, but it is mostly considered to be _____

In Hirudo, Leuckart has described three similar pairs of organs, the structure of which he has fully elucidated.
The Works of Francis Maitland Balfour, Volume III (of 4)|Francis Maitland Balfour
They may either be provided with a peritoneal funnel (Nephelis, Clepsine) or have no internal opening (Hirudo).
The Works of Francis Maitland Balfour, Volume III (of 4)|Francis Maitland Balfour
In Hirudo the posterior sacculation of the stomach is primitively unpaired.
The Works of Francis Maitland Balfour, Volume II (of 4)|Francis Maitland Balfour
They were well known to the ancients under the name of hirudo.
Curiosities of Medical Experience|J. G. (John Gideon) Millingen

In Hirudo and Nephelis the mesenteron has from the first a sack-like form.
The Works of Francis Maitland Balfour, Volume II (of 4)|Francis Maitland Balfour