Koharalepis jarviki was named by Young et al. (1992) [A cosmine-covered canowindrid reaching a length of at least 1 m. Fronto-ethmoidal shield one and a third times as long as parietal shield; breadth/length indices of fronto-ethmoidal and parietal shields about 82 and 125 respectively. Three bones in lateral margin of fronto-ethmoidal shield behind orbit. Pineal plate situated well behind orbit. Pitlines on the posterior dermosphenotic and the lateral extrascapular. Extratemporal broader than long. Median extrascapular slightly longer than broad with a convex posterior margin. Jugal about four times as long as high. Lachrymal reaching mouth margin. Maxilla over six times as long as high, with steep anterior margin. Opercular deeper than long, and subopercular about twice as long as high. Lower jaw with concave ventral margin. Scales rhombic with convex anterior, posterior, and ventral external cosmine margins. Each scale overlapped more by the scale anteroventral to it. ]. Its type specimen is AMF 54325, a partial skeleton (a complete skull and anterior part of the trunk, with part of the pectoral fin), and it is a 3D body fossil. Its type locality is Young et al 1992 Devonian Fish Locality 8, which is in an Emsian/Givetian marine horizon in the Aztec Silstone Formation of Antarctica.