Hirudo Hi·ru·do (hĭ-rōō'dō)
A genus of leeches that includes the species most commonly used in medicine.
In hirudo the posterior sacculation of the stomach is primitively unpaired.
They were well known to the ancients under the name of hirudo.
They may either be provided with a peritoneal funnel (Nephelis, Clepsine) or have no internal opening (hirudo).
In hirudo, Leuckart has described three similar pairs of organs, the structure of which he has fully elucidated.
In hirudo and Nephelis the mesenteron has from the first a sack-like form.
The general development of the body of Nephelis and hirudo is nearly the same as that of Clepsine.
In hirudo, Leuckart (No. 362) has described three similar pairs of organs the structure of which he has fully elucidated.