After the Coccidae the next most important insects economically are the plant lice or Aphididae.
Various, Encyclopaedia Britannica, 11th Edit...(2011)
Coenogonous: oviparous at one season of the year, ovoviviparous at another, as in Aphididae.
Smith, John. B., Explanation of Terms Used in Entomo...(2010)