Sigillum

Definition

Specialized structures found on the body of some spiders, often appearing as small depressions or pits, whose function is not definitively known but may be related to muscle attachment or sensory roles.

Etymology

From Latin 'sigillum', meaning 'small seal' or 'stamp'.

Example

The sigilla on the abdomen of the tarantula can be observed as small, dark pits.

Synonyms

• Sclerotized pits

Related Terms

• Spider anatomy
• Sensory organs
• Exoskeleton

Usage Notes

The exact function of sigilla remains a topic of research, with theories ranging from muscle attachment points to sensory structures.