Taxonomy and Morphological Redescription of Pseudaulacaspis pentagona (Hemiptera: Diaspididae) and Its Parasitoid Fauna

Abstract

Pseudaulacaspis pentagona (Hemiptera: Diaspididae) is an economically important armored scale insect infesting a wide range of agricultural, horticultural, and ornamental plant species worldwide. The present study was undertaken to provide a detailed taxonomic account and morphological redescription of P. pentagona along with an assessment of its associated parasitoid fauna. Infested plant samples were collected from different host plants and geographical locations, and specimens were examined using stereo and compound microscopy following standard slide-mounting techniques. Morphological characterization of adult females focused on diagnostic features including pygidial lobes, gland spines, dorsal ducts, and body segmentation, which are essential for accurate species identification. The study provides an updated morphological redescription with detailed illustrations and measurements to facilitate differentiation of P. pentagona from closely related diaspidid species. In addition, surveys conducted on infested host plants revealed the presence of several hymenopteran parasitoids naturally associated with the scale insect populations. Parasitoids were collected, reared, and identified based on morphological characteristics and available taxonomic keys. The occurrence of parasitoid species indicates their potential role in the natural suppression of P. pentagona populations under field conditions. Observations on parasitization rates and host–parasitoid associations provide valuable insights into the ecological interactions between the pest and its natural enemies. The findings contribute to improved taxonomic understanding and support the development of integrated pest management strategies through the conservation and utilization of beneficial parasitoids. This study also highlights the importance of accurate morphological identification for monitoring and managing armored scale insect infestations in diverse cropping systems.