Phasmister planatus sp. nov.

(Fig. 10A–C)

Material: Kachin amber (c. 99 Mya). Amber piece dimensions: 9 × 5 × 1.5 mm. Amber clear with several insect fragments and air bubbles. Deposited at HUM (SEHU-0000121216) .

Dimensions. Head width: 0.48 mm; width between anterior pronotal angles: 0.6 mm; width between posterior pronotal angles: 1.1 mm; pronotal length: 0.6 mm; sutural elytral length: 1 mm; elytral width (in pair, across widest point): 1.25 mm.

Diagnostic description. The state of pronotal carinae is almost identical to Phasmister parallelus Caterino and Yamamoto, 2023 . However, P. planatus bears a significantly more flattened body shape and several differential characteristics are linked with that— elytra are straight and flat (whereas in P. parallelus they are convex and curved downwards apically), spaces between first dorsal carina and upper epipleural carina and between the upper and lower epipleural carinae are narrower than in P.parallelus . Ventrally, P. parallelus has a long impunctate channel along the metaventral midline. In P. planatus the entire metaventral disc is covered with punctures and displays a finely carinate median metaventral stria.

Etymology: The species name was chosen to signify its flattened body shape.