Cecidosidae

Definition

A family of primitive monotrysian moths (Lepidoptera) distinguished by a piercing ovipositor used to insert eggs directly into plant tissue, inducing gall formation or bark mining. The family exhibits a disjunct distribution with nine described species in southern Africa, five in South America, and the recently described Xanadoses nielseni in New Zealand. Larval development occurs within the modified plant tissue, and some species host minute parasitoid wasps.

Etymology

From Greek kekis (gall) + -idae (family suffix), referring to the gall-inducing habit of larvae.

Example

In southern African fynbos vegetation, cecidosid larvae induce characteristic stem galls on host plants, with parasitoid wasps often attacking the concealed larvae.

Related Terms

• Gall midge
• Cynipidae
• monotrysia
• ovipositor
• cecidology
• Lepidoptera

Usage Notes

The family is placed in the primitive lepidopteran suborder Monotrysia, distinguished from Ditrysia by the single genital opening in females. The piercing ovipositor is convergent with that of some Hymenoptera gall-formers but is not homologous. The disjunct southern hemisphere distribution suggests Gondwanan vicariance, though the family's phylogenetic position within Lepidoptera remains under study.