Chlamydatus collaris Matsumura, 1911: 40 (n. sp.).
I have examined specimens of this species from Russia, Sakhalin Island, Novoalexandrosk, determined by I. M. Kerzhner. The male genitalia are illustrated in figure 39. They are of the type for other species herein placed in Plagiognathus.
HOSTS: Kerzhner (1978) recorded this species from a variety of plants, including Geranium sp. (Geraniaceae), Filipendula sp. and Rosa rugosa (Rosaceae), and Apiaceae.