It is rather the proboscis that is the characteristic apomorphy of the Rhynchobdellida.
2.
They are divided into two groups : Arhynchobdellida and Rhynchobdellida
3.
"' Rhynchobdellida "', the "'jawless leeches "', are classified as an synonymous with the Hirudinea, as all other leech-like annelids might not be very closely related to the true leeches.
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