Ovariole Structure of the Cochineal Scale Insect,Dactylophis coccus

Abstract

The ovaries of the adult cochineal scale insect, Dactylopius coccus Costa (Hemiptera: Coccoidea: Dactylopiidae) are made up of more than 400 short ovarioles of the telotrophic type. The ovarioles develop asynchronously. The ovarioles consist of a germarium with six or seven nurse cells, a vitellarium with an oocyte, and pedicel. A terminal filament is lacking. A maturing oocyte was attached to the trophic core by the trophic cord during previtellogenesis and most of vitellogenesis.

Structure of the female reproductive system of the lac insect, Kerria chinensis (Sternorrhyncha, Coccoidea: Kerridae)

“…By comparison, the lateral oviducts of almost all Coccoidea are unbranched, with the ovarioles dotted along their length. This unbranched arrangement is seen in members of both Archaeococcoidea (Szklarzewicz 1997;Szklarzewicz 1998b;Koteja et al 2003;Szklarzewicz et al 2005Szklarzewicz et al , 2010 and Neococcoidea (Szklarzewicz 1998a;Ram ırez-Cruz et al 2008). Moreover, the nymphal ovaries of scale insects are usually spindle-shaped (Weglarska 1961;Szklarzewicz 1997), whereas the ovaries dissected from the last nymphal stage of K. chinensis are balloon-like clusters of cystocytes that have not been reported in other scale insects.…”

“…, ) and Neococcoidea (Szklarzewicz ; Ramírez‐Cruz et al . ). Moreover, the nymphal ovaries of scale insects are usually spindle‐shaped (Weglarska ; Szklarzewicz ), whereas the ovaries dissected from the last nymphal stage of K. chinensis are balloon‐like clusters of cystocytes that have not been reported in other scale insects.…”

“…The ovaries of K. chinensis show a number of features unique to scale insects (Huebner ; Büning , ; Ramírez‐Cruz et al . ). The number of ovarioles per K. chinensis ovary is about 300 that is similar to the ovaries of scale insects belonging to the Neococcoidea, such as 100–200 reported in D. newsteadi , K. quercus , Gossyparia spuria , Pseudochermes fraxini (Szklarzewicz ), approximately 300 in Eulecanium tiliae (Koteja et al .…”

“…) and 400 in Dactylopius coccus (Ramírez‐Cruz et al . ). In most scale insects, the ovarioles develop asynchronously, which prolongs the oviposition period (Koteja et al .…”

“…The ovaries of K. chinensis show a number of features unique to scale insects (Huebner 1984;B€ uning 1993, 1994Ram ırez-Cruz et al 2008). The number of ovarioles per K. chinensis ovary is about 300 that is similar to the ovaries of scale insects belonging to the Neococcoidea, such as 100-200 reported in D. newsteadi, K. quercus, Gossyparia spuria, Pseudochermes fraxini (Szklarzewicz 1998a), approximately 300 in Eulecanium tiliae (Koteja et al 2003) and 400 in Dactylopius coccus (Ram ırez-Cruz et al 2008). In most scale insects, the ovarioles develop asynchronously, which prolongs the oviposition period (Koteja et al 2003).…”