Brożek, J. 2006 Internal structures of the mouthparts of Coccinea (Hemiptera: Sternorrhyncha).. Polskie Pismo Entomologiczne 75(2): 255-265.

Notes: Internal structures of the mouthparts of Coccinea were examined on the basis of cross-section across the third segment of rostrum. The research was conducted on representatives of 7 families: Orthezia urticae (Ortheziidae), Icerya purchasi (Monophlebidae), Kermes quercus (Kermesidae), Greenisca brachypodii (Eriococcidae), Pollinia pollini (Cerococcidae), Trionymus newsteadi (Pseudococcidae) and Saissetia hemisphaerica [S. coffeae] (Coccidae). The general model of the internal structures of the mouthparts is closely similar in various Coccinea families. In the studied groups of scale insect, there is one model of the inner structure of the mouthparts. Three locks connect the maxillae: dorsal, middle and ventral. The locks consist of various processes. Small differences in the shape of the processes in the middle lock have been observed. The mandibles are not mirror images of each other. In phylogenetic studies, the character of interlocking apparatus and other internal and external structures of the mouthparts in scale insects can be utilized in the identification of higher categories for all the Hemiptera.