Vermiform

Definition

Having the form of a worm; in entomology, describing legless larvae that are cylindrical in cross-section, soft-bodied, and tapering toward the anterior or posterior end, lacking a distinct head capsule or thoracic legs. The term denotes a functional body plan convergent with true worms rather than phylogenetic affinity.

Etymology

From Latin vermis (worm) + forma (shape)

Example

Blowfly larvae (Diptera: Calliphoridae) are classic vermiform maggots: pale, legless, and cylindrical with a reduced head retracted into the thorax, adapted for burrowing into carrion or host tissue.

Synonyms

• worm-shaped
• maggot-like

Related Terms

• apodous
• eruciform
• campodeiform
• scarabaeiform
• elateriform
• maggot
• legless larva

Usage Notes

Vermiform describes gross morphology, not taxonomic identity—vermiform larvae occur in Diptera (true flies), some Hymenoptera (Symphyta), and other endopterygote lineages. Contrast with campodeiform (elongate, active, with well-developed legs), eruciform (cylindrical but with thoracic legs and often abdominal prolegs), scarabaeiform (C-shaped, thick-bodied, with thoracic legs), and onisciform (flattened, oval, with legs). The term is sometimes used more broadly in invertebrate zoology for any worm-like form, but in entomology it carries the specific connotation of soft, legless, cylindrical larvae.