Links between Diaspidoidea and Plants

[Francesco Porcelli]

We are trying to find a link between the systematic of Diaspidoidea,
regarding which we know their host plants up to the genera, and the
systematic of plants.
The question is not to choose just one classification of plants but totry
to use all the main ones: Cappelletti, Cronquist, Strasburger, Dahlgren.
The problem is that the number studies families is different in each
classification as well as the family position inside the classification.
The main questions are:
1) is it possible to tranfer to 100 (or another number) the number of
families in each classification in order to make possible to compare their
different systematic position?
2) How is it possible to solve the absence of Pterydofite and Gymnosperme
in Dahlgren classification?

=46rancesco Porcelli,
Istituto di Entomologia Agraria,
Universit=E0 degli Studi di Bari,
Via Amendola 165
70126 Bari
Italy