Analysis of gonocoxite chaetotaxy patterns reveals new diagnostic characters in hister beetles (Coleoptera: Histeridae)
DOI:
https://doi.org/10.33910/2686-9519-2025-17-4-634-653Keywords:
chaetotaxy, gonocoxites, coxites, diagnostic charactersAbstract
Histeridae is a globally distributed family of predatory beetles that inhabit biotopes associated with their prey, primarily the larvae of other insect groups. Consequently, hister beetles are frequently found in decomposing organic matter of both animal and plant origin. The features of the female genital apparatus are seldom used for species diagnosis in Histeridae, likely due to the perception of their limited significance in beetle evolution. This study presents new morphological characteristics of the gonocoxites, identified using light microscopy and scanning electron microscopy. Pores bearing setae and pores without them were found in the gonocoxite cuticle. The pores without setae may serve a sensory function, as they form regularly arranged clusters. No specific patterns were identified in the arrangement of individual setae; however, presumably homologous clusters were found, allowing for the identification of ventral, distal, dorsal, and medial chaetal fields on the gonocoxite surface. In species of the tribe Histerini, spine-bearing setae were discovered for the first time; these likely aid in egg movement during oviposition. A positive correlation was noted between the internal surface area of the gonocoxite, the number of setae, and the number of micropores.
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