Zigrasimecia hoelldobleri Cao, Boudinot & Gao, 2020 Diagnosis (worker). Large species. Head subquadrate in full-face view. Body pilosity composed of long, flexuous, mildly clavate, and apically truncate setae. Labral distal margin fringed with soft setae. Dorsal mesosomal outline conspicuously convex; propodeum without strongly marked corners between the dorsal and posterior surfaces. Petiolar node apex brief, but not sharp, the transition from the anterior to the posterior surfaces being a short, curved surface. Comments. The holotype of this species is very distinct for its pilosity and large size (Fig. 14), being easily separated from all remaining species of Zigrasimecia by those respects. Two morphospecies are similar to Z. hoelldobleri, however their poor preservation prevents any conclusive identification. See comments under morphospecies Zigrasimecia ufv-04 about a possible complex of species formed by it, Z. hoelldobleri and Zigrasimecia ufv-06. The paratype CNU-HYM-MA2019054 of Z. hoelldobleri, differs considerably from the holotype and is here taken out of the type series of the species for not sharing the same type of setation with the holotype. Moreover, CNU-HYM-MA2019054 propodeum appears to have better-defined faces and the petiolar node with better defined top and posterior faces. The specimen is probably conspecific to specimen CNU-HYM-MA2019065, both are likely members of a new species similar to Z. ferox, but differing from the latter by having somewhat longer and more abundant pilosity on the body, the apex of the node oblique rather than flat, and a slightly different shape of the head, with the anterior section just posterad the clypeal lobes a bit more constricted (see comments about specimen CNU-HYM-MA2019065 below). Alternatively, the limits of Z. ferox could be broadened to include specimens CNU-HYM-MA2019065 and CNU-HYM-MA2019054, something that should preferably be done when more specimens are available and/or can be physically examined. The distalmost row of very thin, crooked setae on the labrum of Z. hoelldobleri holotype is an odd and unique trait of the species; however, it is difficult to check in specimens with a retracted labrum (most of the known specimens so far); therefore, it could be, in fact, a more common trait in the genus.

Published as part of Abstract, Júlio Cezar Mário Chaul, 2023, A revision of the Cretaceous ant genus Zigrasimecia Barden & Grimaldi, 2013 (Hymenoptera: Formicidae: † Zigrasimeciinae), pp. 301-341 in Zootaxa 5325 (3) on page 321, DOI: 10.11646/zootaxa.5325.3.1, http://zenodo.org/record/8243389