184a. Male pores in XIII (seldom in XII, XIV, or XV). Clitellum from XX...XXIV to XXIV...XXVI, tubercula pubertatis as ridges in XXI...XXV to XXIV...XXVII, respectively. Chaetae very closely paired in bundles, especially on tail, thus giving it a quadrangular appearance. Forebody dark, hindbody greyish.
Eiseniella tetraedra
184b. Male pores always in XV; clitellum lies further caudad, its posterior edge reaching at least XXXII. Tail region not quadrangular.
Step 185