Sinoparathyrea gracilenta Pan, Ren & Shih

Pan, Xiaoxiong, Chang, Huali, Ren, Dong & Shih, Chungkun, 2011, The first fossil buprestids from the Middle Jurassic Jiulongshan Formation of China (Coleoptera: Buprestidae), Zootaxa 2745, pp. 53-62 : 56-58

Sinoparathyrea gracilenta Pan, Ren & Shih , sp. nov.

( Figs. 6, 7 , 10, 11 )

Type specimen. Holotype, gender unknown, CNU-COL-NN2010407PC (part and counterpart of one fossil specimen), with partly preserved hind wing, housed in the Key Lab of Insect Evolution & Environmental Changes, Capital Normal University, Beijing, China.

Locality and horizon. Daohugou Village, Middle Jurassic Jiulongshan Formation, Ningcheng County, Inner Mongolia, China.

Etymology. The species name is derived from the Latin word “ gracilentus ” for “slender”.

Diagnosis. Body slender; pronotum about 1.57 times as wide as long; anterior pronotal margin straight, posterior margin slightly bisinuate; posterior 1/2 of the disc with two round maculae covered with dense and irregular polygonal cells; elytra with 9 distinct longitudinal striae, the 5th and 6th, 7th and 8th fused approximately at the apical 1/5, the fused striae fused again at the apical 1/8; disc with six oblong spots; the distance between procoxae wider than distance between mesocoxae.

Description. Body slender, 14.6 mm long and 5.2 mm wide, subcylindrical; pronotum slightly narrower than elytra; surface of body with uniform, small, rounded and dense punctures ( Figs. 10, 11 ).

Head about 0.88 times as wide as the width of the anterior pronotal margin; frontovertex convex; eyes large, oval ( Figs. 6 , 10 ).

Antennal cavities small, widely separated; antennae short, can not reach the posterior angle of pronotum, right one with 8 preserved segments, the left with one preserved segment, antennomere 1 clavate, antennomeres 4−10 serrate ( Fig. 7 ).

Pronotum about 1.57 times as wide as long, the widest part of pronotum at its base; anterior pronotal margin straight, posterior margin slightly bisinuate; lateral margains arcuately expanded posteriorly at anterior 1/3, then weakly incurved at posterior 2/3, basolateral angles acute; integument of pronotum with feeble transverse striae formed by coarse punctates; posterior 1/2 of the disc with two round maculae covered with dense and irregular polygonal cells ( Figs. 6 , 10 ).

Elytra 3.2 times as long as wide, the widest part at the middle; lateral margins weakly arcuate in anterior 2/3, then somewhat narrowed to obtuse apex; epipleura narrow; disc somewhat flattened, with transverse rugae and nine distinct longitudinal striae, the 5th and 6th, 7th and 8th fused approximately at the apical 1/5, the fused striae fused again at the apical 1/8; disc with six oblong spots: two spots located at the anterior 1/3 of disc, two spots located at the middle of disc, two spots at the posterior 1/3 of disc; pygidium round triangular, projecting beyond apex ( Figs. 6, 7 , 10 ).

Hind wings partly preserved; radial cell reduced.

Ventral surface reticulate, finely punctate; prosternum trapezoidal; prosternal process slightly expanded posterior to procoxae, then narrowing to roundedly truncated attenuate apex, process narrower than the diameter of procoxae; procoxae, mesocoxae rounded, distance between procoxae wider than distance between mesocoxae; paracoxal suture straight; metacoxae transverse, short laterally, posterior margin more or less straight; abdominal ventrites with finely, rather dense punctures, which are formed into faint rugae, the first ventrite 3.6 times as long as the second one, ventrites 2−3 subequal in length, 4 longer than 3, and the apex of last ventrite broadly rounded, 1.2 times longer than the previous one ( Figs. 7 , 11 ).

Legs: meso-, metatrochanters trapeziform; femora robust; tibiae more or less straight ( Fig. 7 ).

Dimensions. Body length/body width/elytron length, in mm: CNU-COL-NN2010407: 14.6/5.2/8.4.

Figures

FIGURES 6 − 7. Sinoparathyrea gracilenta sp. nov., line drawings of the holotype. 6 — dorsal view, No. CNU-COL- NN 2010407 P; 7 — ventral view, No. CNU-COL-NN 2010407 C.

FIGURES 10 − 13. 11 − 12, Sinoparathyrea gracilenta sp. nov., photographs of the holotype. 11 — CNU-COL-NN 2010407 P, 12 — CNU-COL-NN 2010407 C; 13 − 14, Sinoparathyrea robusta sp. nov., photographs of the holotype. 13 — CNU-COL- NN 2010410 P, 14 — CNU-COL-NN 2010410 C.