Dyar's Rule

Pronunciation
/DI-ars RULE/
Category
Growth
Singular
Dyar's Rule
Plural
Dyar's Rules

Definition

A biological rule that states that the width of an insect's head capsule increases by a factor of 1.2-1.4 between each molt.

Etymology

Named after entomologist Harrison Gray Dyar Jr., who published his observations in 1890.

Example

Dyar's rule helps determine the size of an insect at different stages of development.

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