Abstract
A new, extraordinary palaeontinid Hallakkungis amisanus Nam, Wang & Szwedo, gen. et sp. nov., from the Upper Triassic of the Amisan Formation in Boryeong City, Korea is described. It is the first Palaeontinidae from Korea. The newly described taxon displays a mosaic of characters present in presumed ancestors of this insect family and some highly advanced features.
Highlights
The first record of the Late Triassic palaeontinid from Korea presented below comes from the upper deposits of the Nampo Group
Stem of subcosta posterior (ScP) with several branches intersecting costal area and costal cell, basal portion of ScP shifted from common stem radius +media posterior +cubitus anterior (R +MP +CuA) in distance exceeding the length of basal cell
Remarks: Based on some venational characters, e.g. anterior margin indented, costa posterior (CP) present and ScP with several branches, this new genus is similar to Fletcheriana Evans, 1956, which was reported from the Middle Triassic of Australia
Summary
This specimen was examined with a dissecting microscope (Nikon SMZ 800) and illustrated with the aid of a drawing tube attached to the microscope. Stem R strongly curved anteriad at base, forked basad of nodal line incision, slightly posteriad of stem MP forking; branch RA forked basad of nodal line incision, terminal ScP short, branch RA1 reaching anterior forewing margin at about half of post-incision portion length, branch RA2 longer, reaching anterior margin distinctly basad of anteroapical angle. Crossvein r-mp[1] short, distinctly apical of nodal line; crossveins mp3+4-cua long, sigmoid, included to nodal (flexion) line, connecting branch MP3+4 slightly after stem MP forking with stem CuA at half of its length after separation from basal cell. From nodal line incision at anterior margin, through terminal ScP, stem R forking, cutting branches MP1+2 and MP3+4 slightly after the stem MP forking, followed with crossvein mp3+4-cua for a long interval and after separating from mp3+4-cua crossvein, fused with basal 1⁄3 of branch CuA2 separating from CuA2 and reaching CuP at level of claval apex
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