1. Gonostylus with apical part of main lobe аcute-triangular. Dorsocentrals 10–14. Scutellum with 7–9 setae. (Novaya Zemlya).......................................................... Chaetocladius (Amblycladius) subplumosus (Kieffer)
- Gonostylus with apical part of main lobe rectangular, not tapered in apical part, rounded at outer margin near apex. Dorsocentrals 21–25. Scutellum with 18 setae. (Franz Josef Land)....... Chaetocladius (Amblycladius) franzjosephiensis Krasheninnikov