Originicorizus Yao, Cai & Ren

Yao, Yunzhi, Cai, Wanzhi, Ren, Dong & Shih, Chungkun, 2006, New fossil rhopalids (Heteroptera: Coreoidea) from the Middle Jurassic of Inner Mongolia, China, Zootaxa 1384, pp. 41-58 : 42-44

Genus Originicorizus Yao, Cai & Ren , gen. nov.

Type species. Originicorizus pyriformis Yao, Cai & Ren , sp. nov.

Diagnosis: Body elongate-oval. Head large, width and length subequal, longer than pronotum, anteocular portion longer than postocular, apex surpassing first antennal segment, clypeus surpassing mandibular plates; eyes relatively small, round; antenna 4-segmented, longer than head and pronotum combined, first segment shortest, second longest and slender, fourth segment fusiform, thickest, shorter and stouter than third; rostrum arising from apex of head, stout, extending to second abdominal sternite, first segment concealed between bucculae, acute distally. Pronotum trapezoidal, length shorter than width, without collar; scutellum triangular, longer than pronotum at midline, wider than length; femora distinctly thicker and shorter than tibiae, mid legs longer than fore legs, hind legs longest, tarsus 3-segmented, subequal in thickness, first and second subequal in length, third longest; hemelytron macropterous, long and narrow, apical margin rounded, reaching to tip of abdomen, with distinct embolium, corium slightly elongated on costal margin, corium venation prominent, main veins form four cells, two large and two small, C present, connected with Sc at basal 1/3 of corium, and forming a merged vein, C+Sc, this ending at apex of corium, Sc separating from Sc+R at basal 1/4 of corium, very short, Sc+R and Cu diverging at a single point at basal of fore wing, and forming a large cell, a cross vein near corium-membrane boundary joined with C+Sc, R, M, and Cu to form three cells, outside cell largest; 1A on middle of clavus, posterior claval vein 2A along hind margin of clavus and ending apex; clavus considerably large, forming claval commissure, membrane with some longitudinal veins. Abdomen oval, with wide connexivum, ovipositor very long, not projecting beyond last paratergites, extending through last three abdominal segments.

Distribution. China.

Etymology: The generic name is a combination of the Latin origo (“ancestor”) and Corizus (a genus of modern Rhopalidae ).

Remarks: The venation and cells of the corium of Originicorizusis are very similar to those of some modern Rhopalidae . The new genus retains a primitive pattern of corium venation, a distinct C+Sc forming a large cell, C+Sc ( Fig. 8 ). This venation is not preserved in extant Coreoidea, but occurs in the extinct Pachymeridiidae (Upper Triassic to Lower Cretaceous), which is considered ancestral to Coreoidea ( Popov 1986, 1990; Shcherbakov & Popov 2002; Popov, Dolling & Whalley 1994). In recent rhopalids, C is absent; and Sc has three patterns: (1) Sc is fused to R at basal 3/4 of corium and, with R, forms a cell (e.g., Liorhyssus ) ( Fig. 9 ); (2) Sc substitutes as C on the costal margin (e.g. Brachycarenus ) ( Fig. 10 ); (3) Sc is reduced, free, very short, on the submargin (e.g. Serinetha ) ( Fig. 11 ). The new genus most closely resembles the first pattern, but differs in that Sc is fused to R at basal 1/3 of corium and R forms a large cell (vs. Sc is fused to R at basal 3/4 of corium and with R forming a small cell). In addition, cell M has two forms: trilateral and quadrilateral. Cell M of Originicorizusis and a majority of extant rhopalids is quadrilateral, so a trilateral cell M is probably apomorphic.

The new genus can be easily distinguished from the fossil genera Miracorizus Ya o, Cai & Ren, 2006 and Longiclavula Yao, Cai & Ren, 2006 , in the ratio of the second antennal segment to the third, which about 1.4:1 (vs. over 1.5:1); pronotum without collar (vs. with distinct collar); and with claval commissure (vs. without claval commissure).

Figures

FIGURES 8 – 11. Hemelytral venation in Originicorizus and some genera of extant Rhopalidae, 8. Originicorizus; 9. Liorhyssus hyalinus (based on Nonnaizab 1988); 10. Brachycarenus tigrinus (based on Li & Zheng 1994); 11. Serinetha sp. (based on Hsiao et al. 1977). Basal cell shaded. Scale bar = 1 mm.