Priacma renaria, Tan, Jingjing, Ren, Dong & Shih, Chungkun, 2006

Tan, Jingjing, Ren, Dong & Shih, Chungkun, 2006, First record of fossil Priacma (Coleoptera: Archostemata: Cupedidae) from the Jehol Biota of western Liaoning, China, Zootaxa 1326, pp. 55-68 : 65-67

publication ID	https://doi.org/ 10.5281/zenodo.174106
DOI	https://doi.org/10.5281/zenodo.6259437
persistent identifier	https://treatment.plazi.org/id/038D87F9-FFD7-981A-7120-FEDCD38EFD84
treatment provided by	Plazi
scientific name	Priacma renaria
status	sp. nov.

Treatment

Priacma renaria sp. nov.

( Figs. 4 View FIGURES 1 – 4 , 19–23, 25 View FIGURES 19 – 21 View FIGURES 22 – 25. 22 )

Diagnosis. Differs from P. serrata in the absence of spines on edge of elytra. From P. corrupta in the mesosternum of new species without cross suture, from P. longicapitis and P. oculata in the ventral head surface of new one without grooves for inserting antennae, from P. striata in the elytron of new one without paler flecks, from P. sanzii in new one’s antennal second segment shorter than third segment. P. renaria sp. nov. is distinct from other new species described here by being largest, by having elytral cells polygonal without black macula on their margins, and by the presence of about 43 elytral cells in a row.

Description. Body length 19.5 mm, body width 5.0 mm, elytron length 14.0 mm. Largesized and subcylindrical beetle, covered with tubercles ( Fig. 4 View FIGURES 1 – 4 ).

Head wider than long, trapeziform, bearing two pairs of tubercles, anterior pair of tubercles at base of antennae, conical, small, shape of posterior ones like kidneyform, larger than anterior pair; eyes mediumsized; mandibles prominent, broad, flattened, shorter than half width of head, tridentate in horizontal cutting surface ( Fig. 22 View FIGURES 22 – 25. 22 ), cervical constriction distinct.

Antennae filiform, incomplete (with 9 visible segments), scape shortest, thicker than other segments, pedicel 0.85 times as long as third antennomere ( Figs. 19 View FIGURES 19 – 21 , 22 View FIGURES 22 – 25. 22 ), following segments homonomous.

Pronotum transverse, slightly wider than head, narrowed towards base, about 0.85 times as wide as long at posterior edge, anterior margin straight, anterior angles oblique ( Figs. 19 View FIGURES 19 – 21 , 22 View FIGURES 22 – 25. 22 ), without propleuron, disc of pronotum bearing 2 oblong elevations; scutellum subtriangular.

Elytra about 2 times as wide as prothorax, 4.4 times as long as wide, epipleural rim narrow, with 10 rows of cells, elytral cells quadrangular, without black macula on their margins ( Figs. 21 View FIGURES 19 – 21 , 25 View FIGURES 22 – 25. 22 ), approximately 43 cells formed in a row.

Ventral surface ( Fig. 20 View FIGURES 19 – 21 ) with gula rectangular, reaching posterior ridge of the head, widening posteriorly, genae widely separated ventrally. Procoxal cavities separated, prosternal process extending beyond coxae. Metaventrite trapezoidal, transverse, 0.7 times as wide as long (at posterior margin), without longitudinal suture on metaventrite ( Fig. 23 View FIGURES 22 – 25. 22 ). Abdomen with 5 visible ventrites superimposing each other, narrowed from the base of fifth visible ventrite, first visible abdomen ventrite longest, 2–4 visible abdomen ventrites equal in length, last visible ventrite 2.2 times as long as the previous one, its apex tapered.

Legs with procoxae rounded, small, protrochanter triangular, profemora long, thick, protibiae comparatively slim, shorter than profemora; mesocoxae oblong, mesotrochanter small, circular, mesotibiae as long as mesofemora; metafemora short, metatibiae longer than metafemora, metatarsi with 5 segments, fifth segment longest, following segments homonomous ( Fig. 20 View FIGURES 19 – 21 ).

Holotype. Nearly complete adult, No. CNU –C–LB2006002, housed in the Key Lab of Insect Evolution & Environment Change, College of Life Science, Capital Normal University, Beijing, China.

Locality and horizon. Collected near Chaomidian Village, Beipiao City, Liaoning Province, China; the Yixian Formation, Late JurassicEarly Cretaceous (Late Tithonian to the Berriasian).

Etymology. The specific epithet derives from the Latin adjective renarius, a, um (of or belonging to kidneys). It refers to the kidneyshaped tubercles on the head.