Sugiura, N., & Takagi, M. 1998 The number of larval instars in Aphytis yanonensis DeBach et Rosen and Coccobius fulvus (Compere et Annecke) (Hymenoptera: Aphelinidae), two introduced parasitoids of the arrowhead scale, Unaspis yanonensis (Kuwana) (Homoptera: Diaspididae).. Entomological Science 1: 185-188.

Notes: Larval mandible lengths of Aphytis yanonensis and Coccobius fulvus, parasitoids of Unaspis yanonensis, were measured to determine the number of larval instars in these parasitoids. Mandible length frequency distributions over a period of days showed three distinct peaks, indicating that A. yanonensis and C. fulvus possess three larval instars. Sickle-shaped mandibles were observed in 1st-instar larvae of C. fulvus but were lacking in A. yanonensis.