Kachinus
Kachinus is an extinct genus of ant-like stone beetle in the family Staphylinidae containing the single species Kachinus antennatus. History and classification. The type species, "K. antennatus", is known from only the holotype, a single, complete adult, now deposited in the American Museum of Natural History as specimen number "AMNH Bu-113". The amber specimen is from deposits in Kachin State, Tanai Village, northwest of Myitkyina, Myanmar. The holotype was first studied by Stylianos Chatzimanolis of the University of Tennessee, Michael Engel of the University of Kansas, and Alfred Newton of the Field Museum. Chatzimanolis, Engel and Newton published  their 2010 type description for "K. antennatus" in the journal "Cretaceous Research". The genus name is a masculine derivation of the Kachin State in Northern Myanmar where the amber containing the type specimen was unearthed. The species name "antennatus" is Latin, signifying "antennaed". The second species, "K. magnificus", was described from the Albian amber from Spain; however, this species was subsequently made the type species of a separate genus "Archeutheia" by Jałoszyński & Peris (2016). Description. The beetle is small, only long, possessing a light brown body with yellowish brown legs, antennae, and head. "Kachinus" has a unique combination of characters  found in both the Cephennini and Eutheiini tribes of the Scydmaeninae supertribe Scydmaenitae. Elytra and pronotum which are not clearly discontinuous and a head which does not have a narrowed area from the vertex to the occiput are features found in the modern Cephennini genera. However the overall pronotum shape and body shape combined with shortened elytra are distinct features of Eutheiini. It is noted that with the distinctly elevated mesosternal keel "Kachinus" is similar in appearance to the modern genus "Paraneseuthia".