Crawler

Definition

A common name for insects characterized by slow, deliberate locomotion or cryptic, ground-dwelling habits; applied to several unrelated groups that share this ecological or behavioral profile rather than a phylogenetic relationship.

Etymology

From the verb 'crawl,' referring to the slow, low-to-substrate movement typical of these insects.

Example

Ice crawlers (Grylloblattidae) are wingless insects of cold habitats that move slowly across rock surfaces, while spiny crawler mayflies (Ephemerellidae) are named for their behavior of crawling along stream bottoms rather than swimming actively.

Related Terms

• Grylloblattidae
• Mantophasmatidae
• Ephemerellidae
• cryptic behavior
• ground-dwelling
• wingless
• aptery

Usage Notes

As a common name, 'crawler' has no taxonomic standing and groups ecologically similar but phylogenetically distant insects. It contrasts with more active descriptors like 'jumper' or 'swimmer.' In entomological literature, the term is usually paired with a modifier (e.g., 'ice crawler,' 'rock crawler') to specify the group. The word is also used in agriculture for the mobile first-instar nymphs of scale insects (Coccoidea), a separate usage referring to the dispersal stage before they settle and become sessile.