Ortheziidae

Definition

A family of scale insects (Hemiptera: Sternorrhyncha: Coccoidea) commonly known as ensign scales or ortheziids, distinguished by the presence of well-developed legs and antennae in adult females and the production of a conspicuous, often fluted or fringed, waxy ovisac that is carried externally at the posterior end of the body. Members occur globally but show highest diversity in the Neotropical and Nearctic regions. The family comprises approximately 20 genera and 200 described species.

Etymology

From the type genus Orthezia (Greek orthezia, 'a small bed or couch', referring to the scale's protective covering) + -idae (family suffix).

Example

Adult females of Orthezia urticae, the nettle ensign scale, remain mobile throughout life and can be observed walking on host stems while dragging their white, ribbon-like ovisacs behind them—a trait that distinguishes Ortheziidae from most other scale insect families where females are sessile.

Synonyms

• ensign scales
• ortheziids

Related Terms

• Coccoidea
• scale insects
• Sternorrhyncha
• Mealybugs
• ovisac
• Sessile
• waxy test

Usage Notes

The common name 'ensign scales' refers to the flag-like ovisac carried by females. Ortheziidae is one of the more primitive families within Coccoidea, retaining mobility and visible segmentation in adult females—features lost or reduced in more derived scale insect families such as Diaspididae (armored scales) and Coccidae (soft scales). Identification to genus often requires examination of abdominal spiracle and wax-gland morphology.