Takagi, S. 2022 Another Mode of Life in Armoured Scale Insects (Sternorrhyncha : Coccoidea : Diaspididae).. Insecta Matsumurana (New Series) 78: 27–56
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Notes: Thecatosoma, n.g., is proposed and T. caudatum (type-species), T. verticale, T. auriculatum, T. gracile, and T. crenatum, n.spp., are described from eastern tropical Asia (Palawan; Malaya; Borneo). The adult females of these scale insects are peculiar in having at maturity the head, all the thoracic segments, and the first abdominal segment coalescent to form an elongate sheath-like structure or ‘theca’, which is heavily sclerotized on the dorsal surface and along the body margin on the ventral side.
