Assertion: earthworm's segment | /r/HasAspect | acanthobdellida
Facets:
Source sentences:
text: Euhirudinea ('true' leeches) have 32 internal segments when mature and Acanthobdellida (a small group of fish leeches) have 29, but counting is difficult because four to six segments are included in an front sucker and seven in a rear sucker, while the remaining segments are secondarily annulated (ringed) to give two to five apparent segments per internal septum (internal membrane).