Arthropleidae

Definition

A family of flatheaded mayflies (order Ephemeroptera) characterized by dorsoventrally flattened nymphs adapted for clinging to substrates in flowing water. The family comprises at least two genera, including one extinct taxon, and represents a distinct lineage within the broader mayfly radiation.

Etymology

From the type genus Arthroplea (Greek arthron, 'joint' + pleo, 'swim') + -idae, family suffix.

Example

Nymphs of Arthropleidae possess broad, flattened bodies and strong legs for attachment to stones and woody debris in streams, a morphology convergent with other rheophilic mayfly families such as Heptageniidae.

Related Terms

• Ephemeroptera
• Heptageniidae
• Arthroplea
• flatheaded mayfly
• rheophilic
• nymph

Usage Notes

The family is relatively small and morphologically specialized compared to the speciose Baetidae and Heptageniidae. Identification to family relies on nymphal characters including head shape and gill structure; adults are less frequently encountered. The extinct genus within the family indicates a formerly broader distribution or diversity.