Key: Step 792. Orthocladiinae 204 Chaetocladius

792a. Lateral setae of segments II-VI of 3 sizes: 1st and 3rd similar in diameter, stiff; the 2nd narrower, longer and flexible; the 4th very narrow.

Chaetocladius perennis

792b. Lateral setae 1-3 of segments II-VI of similar diameter and length, flexible, the 4th narrower and shorter.

Step 793. Orthocladiinae 205 Chaetocladius
Decision path