Type locality and age: China, Liaoning Province, Shangyuan County, Chaomidian Village, Huangbanjigou, Yixian Formation, Early Cretaceous, Lower Cretaceous, Aptian, 124.6 Mya (Swisher et al., 1999). An alternative dating was proposed by Zheng et al. (2003): Jurassic–Cretaceous boundary, Late Tithonian to Berriasian, c. 145–140 Mya. See Ren et al. (2010) for discussion on various datings of the formation.

Material examined (three specimens): Holotype: CNU COL LB 2009074, piece only (Figs 5F–G, 7M–O). Paratypes: CNU COL LB 2009107, piece only (Fig. 5I); CNU COL LB 2010014, piece only, with detached posterior leg (Fig. 5H).

Description: Body widely oval. For body measurements see Table 1.

Head. Clypeus large; frontoclypeal sutures very distinct, reaching lateral margin of head closely before eyes; anterior margin excised, excision angular laterally. Eyes rather large, separated by 2.3× the width of one eye. Labrum transverse, partly exposed anterior to clypeus, slightly narrowing posteriad, weakly convex on anterior margin. Gula narrowing anteriad, with longitudinal ridge mesally, gular sutures widely separated. Mentum rather small, subrectangular, c. 2.4× wider than long.

Prothorax. Pronotum transverse, slightly narrowing anteriad; lateral margin arcuate. Prosternum probably rather long, with median elevation or carina. Procoxae contiguous.

Mesothorax. Mesoventrite subtriangular, extremely narrow at anterior margin. Anapleural sutures well developed, slightly curved, converging anteriad, joint at anterior margin of mesoventrite. Mesepimeron large, subtriangular. Mesocoxae only narrowly separated. Scutellar shield small, triangular, pointed posteriorly. Elytra combined widest anteriorly; each elytron with sharply impressed sutural stria; elytra with coarsely punctate elytral series; epipleuron well developed anteriorly, moderately wide.

Metathorax. Metaventrite much longer than mesoventrite, probably not elevated mesally, narrowly projecting between mesocoxae anteriorly; only slightly projecting posteriad. Anepisternum 4.4× as long as wide.

Abdomen with five ventrites; ventrite 5 with shallow wide apical emargination.

Differential diagnosis: For differential diagnosis from H. elongata see above under that species.

Etymology: The species name refers to the wide body of this species.