Currently, the genus Chimarra Stephens (Trichoptera: Philopotamidae) is represented in
the Oriental Region by 259 species. Of these, 61 species have been described or recorded from Vietnam.
In this paper, 9 new species from Vietnam are described and illustrated (Chimarra aculeata, C.
carinata, C. corneola, C. insolita, C. mina, C. prominens, C. rostrata, C. undulata, and C. ungula).
In addition, 3 new country records are noted (Chimarra areli Malicky and Mey, Chimarra pipake
Malicky and Chantaramongkol, and Chimarra suthepensis Chantaramongkol and Malicky), and 1
new species group (minuta Group) is proposed and populated. An additional species group (georgensis
“Group”), with 1 new species from Vietnam, but otherwise only known from Africa, is discussed, but
not formally defined. A table listing all known Vietnamese species of Chimarra is included, along
with discussion of variability in the anal veins of the