Cretanabis 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 : 42-44

Genus Cretanabis Kim & Jung gen. nov.

Type species. Cretanabis kerzhneri sp. nov., by present designation.

Etymology. Name derives from a combination of Cretaceous and ‘ Nabis ’, referring to the nabine group from the Cretaceous; gender masculine.

Diagnosis. Differs from the nymphs (III instars) of other nabine genera(e. g., Arachnocoris Scott,1881 ; Gorpis Stål, 1859 ; Himacerus s. str. Wolff, 1811; Hoplistoscelis Reuter, 1890 ; Lasiomerus Reuter, 1890 ; Nabis s. lat. Latreille, 1802; Stalia Reuter, 1872 ; Stenonabis Reuter, 1890 ) by the following combination of characters: body ovoid, armed with long sparse spines; head length less than width, width more than first antennomere length; antennae shorter than body length; first segment significantly thick; tapered to apex; third and fourth antennomeres covered with long setae; pronotum trapezoid, basal width less then basal width of mesothorax; femora and tibiae with long spines; tarsus less than 1/2 length of tibia in midleg; tarsus less than 1/3 length of tibia in hindleg; second tarsomere longest in mid and hind legs.

Description. Body ovoid, unicolorous. Surface and vestiture. Body glabrous, armed with long spines; head with spines ( Fig. 2A, B ); antennae covered with long setae ( Fig. 2C ); pronotum with spines laterally; legs with spines, tibia with dense spines. Structure. Head: hypognathous, wider than long; vertex narrow, narrower than a single compound eye width; antennae cylindrical, linear, shorter than body length; first antennomere shortest, shorter than head width. Thorax: pronotum trapezoid, anterior width shorter than head width; pronotal midline length as long as 1/2 of basal width, longer than mesothorax midline length; mesothorax basal width more than pronotal basal width; legs generally slender; fore femur slightly incrassate; fore femur as long as fore tibia; femora and tibiae with spines ( Fig. 2D, E ); tarsus three segmented, tarsus less than 1/2 length of tibia in midleg, tarsus less than 1/3 length of tibia in hindleg; second tarsomere longest. Abdomen: ovoid, abdominal segment VII widest. Genitalia: not visible.

Remarks. A structure that morphologically resembles a fossula spongiosa is thinly developed on the apex of fore and middle tibiae. Further detailed examination of this structure is needed using suitable methodology (e. g., micro-CT, laser scanning confocal microscopy).

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).