A vessel that contains or conveys lymph, that originates as an interfibrillar or intercellular cleft or space in a tissue or organ, and that if small has no distinct walls or walls composed only of endothelial cells and if large resembles a vein in structure[BTO].
Comment:
[homology-note] "Tetrapods have evolved distinct lymphatic systems, in which lymphatic capillaries help drain most of the tissues of the body.[well established][VHOG]" xsd:string {date_retrieved="2012-09-17", external_class="VHOG:0001249", ontology="VHOG", source="ISBN:978-0030223693 Liem KF, Bemis WE, Walker WF, Grande L, Functional Anatomy of the Vertebrates: An Evolutionary Perspective (2001) p.627", source="http://bgee.unil.ch/"}