Cretanabis kerzhneri gen. et sp. nov., the oldest nabine genus and species (Hemiptera: Heteroptera: Nabidae) from the mid-Cretaceous Burmese amber Author KIM, JUNGGON Author ROCA-CUSACHS, MARCOS Author PHAM, THAI HONG PHAM Author JUNG, SUNGHOON text Palaeoentomology 2023 2023-02-28 6 1 41 48 http://dx.doi.org/10.11646/palaeoentomology.6.1.7 journal article 10.11646/palaeoentomology.6.1.7 2624-2834 7754940 039F76C9-00B9-47A2-8589-1FE9E4705899 Cretanabis kerzhneri Kim & Jung sp. nov. ( Figs 2 , 3 ) Type material. [ CRBA ] Holotype : Holotype male in a 25×10× 3 mm cabochon-shaped piece of amber. Dorsal and ventral surfaces flat . Etymology. Named in memory of Izya M. Kerzhner, a taxonomist of Nabidae ; treated as a noun in genitive case. Diagnosis. As for genus. Type locality and horizon. Uncertain locality in the Kachin State , northern Myanmar ; mid-Cretaceous ( Mao et al ., 2018 ) . Description. Instar III (supposed to belong to this instar). Body ovoid, length 2.36 mm . Coloration . Mostly of brown coloration, nearly unicolorous. Surface and vestiture . Body glabrous, beset partly with long spines on frons, clypeus and mandibular plates of head, thorax laterally, and femora and tibia of legs; third and fourth antennomeres covered with long setae. Structure . Head: hypognathous, length less than width, more than pronotal midline; vertex narrow, narrower than a single compound eye width; ocelli absent; antennae cylindrical, linear, shorter than body length; first antennomere shortest, shorter than head width; second antennomere as long as head width and third antennomere, slightly thicker than third and fourth antennomeres; fourth antennomere longest; proportion of first to fourth segments 0.23: 0.48: 0.43: 0.61; labium missing. Thorax: pronotum trapezoid, anterior width shorter than head width, pronotal midline length as long as 1/2 of basal width,longer than mesothorax midline; mesothorax without distinct wing pad, posterior margin slightly sinuate, posterior width more than pronotal posterior width; legs generally slender; fore femur slightly incrassate and as long as fore tibia; apical part of tibia with dense spines, less than 10 in number; tarsus threesegmented, length less than 1/2 tibia in midleg, and less than 1/3 tibia in hindleg. Abdomen: ovoid, abdominal segment VII widest. Genitalia: not developed. Measurements. (in mm) body length: 2.36; head length 0.51; head width including compound eyes: 0.53; vertex width: 0.11; first antennomere: 0.23; second antennomere: 0.48; third antennomere: 0.43; fourth antennomere: 0.61; anterior pronotal width: 0.28; pronotal midline length: 0.33; basal pronotal maximal width (straight): 0.44; hindleg (femur: tibia: tarsus): 0.88: 1.77: 0.43. Remarks. The nymphal instar III was determined by the shape of body and wing pad development (no wing pad in this fossil specimen ( Figs 2 , 3 )).