A new method using Scanning Electron Microscopy (SEM) for preparation of anisopterous odonates

Area of Science:

• Entomology
• Zoology
• Microscopy

Background:

• The male anisopterous odonate secondary genitalia, particularly the vesica spermalis, possess key species-specific characters.
• Observing these often membranous structures via Scanning Electron Microscopy (SEM) is challenging due to specimen preparation artifacts.

Purpose of the Study:

• To introduce a novel, cost-effective SEM procedure for examining anisopterous odonate male secondary genitalia.
• To overcome limitations posed by dehydration and metallization in SEM observation.

Main Methods:

• Development of a new, low-cost preparation protocol for SEM.
• Testing compatibility of the protocol with standard specimen preservation agents.

Main Results:

• The proposed method facilitates the observation of critical, delicate characters on the vesica spermalis.
• The procedure is compatible with common specimen preservation methods, minimizing artifact introduction.

Conclusions:

• This new SEM technique offers a viable and accessible approach for detailed morphological studies of dragonfly genitalia.
• Improved visualization of the vesica spermalis aids in accurate species identification and taxonomic research.