''Zaitzevia tsushimana'' is a small, wingless beetle in the family
Elmidae
Elmidae, commonly known as riffle beetles, is a family of beetles in the superfamily Byrrhoidea described by John Curtis in 1830. Both adults and larvae are usually aquatic, living under rocks in fast-flowing shallow areas of streams, such as ...
. The species is found in the
Nagasaki Prefecture
is a Prefectures of Japan, prefecture of Japan, mainly located on the island of Kyūshū, although it also includes a number of islands off Kyūshū's northwest coast - including Tsushima and Iki. Nagasaki Prefecture has a population of 1,246,4 ...
of
Japan
Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asia, Asian mainland, it is bordered on the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea ...
.
Description
The species's head is black and its
elytra
An elytron (; ; : elytra, ) is a modified, hardened forewing of beetles (Coleoptera), though a few of the true bugs (Hemiptera) such as the family Schizopteridae are extremely similar; in true bugs, the forewings are called hemelytra (sometime ...
are also normally black but can also have a purple and brown hue. Its claws and mouth parts are brown, and the surface of its underside is dark brown.
The species is most similar to ''
Zaitzevia rivalis'', but can be told apart by its smaller body, triangular
scutellum, and the sparse serration of its elytra.
References
{{Taxonbar, from=Q2496886
Elmidae