1) The eisenia are oligochaeta 
[alga] Eisenia is a brown alga genus in the family Lessoniaceae. The genus is names for California Academy of Sciences curator, Gustav Eisen. Eisenia bicyclis (荒布) is a species of kelp best known for its use in Japanese cuisine. ...[annelid] Eisenia is a genus of earthworm. ...
(from the article `annelid`) ...behind segments containing the testes or, when 2 pairs of testes are present, in more posterior segment; size, minute to 30–40 cm; examples of ...
The eisenia are a species of the order Oligochaeta.