Koteja, J. 2001 Essays on coccids (Hemiptera: Coccinea). Paleontology without fossils?. Prace Muzeum Ziemi No. 46: 41-52.

Notes: Only a few phylogenetic conceptions that consider time were proposed for the scale insects, and they have been critically reviewed on the basis of the currently available fossils. Evident pre-Cretaceous coccid fossils are still lacking. Scale insects appeared "suddenly" as a large and diverse group in early cretaceous.