Cretanabis kerzhneri Kim & Jung, 2023

KIM, JUNGGON, ROCA-CUSACHS, MARCOS, PHAM, THAI HONG PHAM & JUNG, SUNGHOON, 2023, Cretanabis kerzhneri gen. et sp. nov., the oldest nabine genus and species (Hemiptera: Heteroptera: Nabidae) from the mid-Cretaceous Burmese amber, Palaeoentomology 6 (1), pp. 41-48 : 44

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 )).

Figures

FIGURE 2. Cretanabis kerzhneri sp. nov., holotype (CNUHHNF001). A, Dorsal habitus. B, Head. C, Antennae. D, Mid-leg. E, Hind-leg. F, Ventral habitus. Scale bars = 1 mm (A, F), 0.5 mm (B–E).

FIGURE 3. Habitus drawings of Cretanabis kerzhneri sp. nov. A, Dorsal habitus. B, Ventral habitus. Scale bar = 1 mm.