Freshwater Oligochaeta of North-West Europe 1.0: Dichotomous key: step 193: "Family Octochaetidae"

Key: Step 193. Family Octochaetidae

193a. Two pairs of prominent prostate pores, in XVII and XIX, along the line of ventral chaetae, connected with each other by two longitudinal seminal grooves. Paired male pores between them in XVIII, discharging into seminal grooves. Penial chaetae of two kinds, larger one in each bundle, about 5 µm thick, showing some scars in its distal portion, and smaller one twice as thin, smooth and with spoon-like tip. Single female pore on papilla midventral in XIV. Clitellum from XIII or XIV to XVIII...XXI.

Dichogaster bolaui

193b. Single pair of prostatic pores in XVII, male pores in 17/18. Penial chaetae of two sizes in bundle, with knob-like tip. Female pores in XIV closely paired. Clitellum covering XIII-XI.

Dichogaster saliens

Remaining
Excluded

Dichogaster bolaui
Dichogaster saliens

Decision path