Leg formula

Definition

A notation used to describe the relative lengths of the legs of spiders or other arachnids, usually listed in order of the first, second, third, and fourth pairs of legs.

Etymology

Derived from the Latin word 'leg', meaning 'leg', and 'formula', meaning 'a rule or method'.

Example

The leg formula of the wolf spider is typically given as 4123, indicating that the fourth pair of legs is the longest and the third pair is the shortest.

Synonyms

• Leg sequence
• Leg arrangement

Related Terms

• Arachnid morphology
• Spider legs
• Appendages

Usage Notes

The leg formula is useful for identifying species of arachnids, as different species often have characteristic leg lengths and sequences.