Wormaldia

Identification relies heavily on male genitalia examination, particularly structures of tergum X and associated parameters. Wing venation patterns provide supplementary characters. For larvae, diagnostic features include head capsule sclerotization patterns and abdominal gill arrangements; a larval key exists for West Palearctic species. Species-level identification requires specialist taxonomic literature; the genus is distinguished from other Philopotamidae by combinations of genitalic and wing characters detailed in regional revisions.

Semi-aquatic; larvae inhabit lotic (flowing water) environments. The W. occipitalis species complex occurs in streams and rivers around the Alps and Central Europe, with postglacial recolonization patterns documented. Specific microhabitat preferences vary by species but generally involve cool, flowing waters where larvae construct their characteristic fingernet capture nets.

Global distribution spanning all biogeographic regions except Australasia. Nearctic: Canada to southwestern USA and Mexico. Neotropical: Mexico through Central America to northern South America (Colombia, Venezuela, Ecuador, Peru, Bolivia). Palearctic: Europe including Alps, Germany, Greece, and Aegean islands; also Scandinavia. Fossil record: Late Cretaceous Burmese amber (Myanmar). Approximately 175 extant species described.

Complete metamorphosis with aquatic larval and terrestrial adult stages. Larvae are aquatic filter-feeders. Specific developmental timing and voltinism patterns not documented in available sources.

Larvae construct and occupy fingernet capture nets—loose, net-like silk structures positioned in flowing water to capture drifting particulate food. Adults are typically nocturnal and attracted to light. No other specific behaviors documented.

Larvae function as filter-feeders in lotic ecosystems, processing fine particulate organic matter. Their fingernet nets represent a distinctive foraging adaptation among Trichoptera. Specific ecosystem contributions (nutrient cycling, prey for other organisms) inferred from family-level ecology but not quantified for Wormaldia.

No direct economic or medical significance documented. Of interest to aquatic entomologists, taxonomists, and biogeographers. Used as a model system for studying cryptic species complexes and postglacial biogeography (W. occipitalis species complex).

• ChimarraLargest genus in Philopotamidae; distinguished from Wormaldia by male genitalic structure, particularly tergum X morphology and associated parameters. Both genera share fingernet larval nets and reduced wing venation.
• DolophilodesNearctic Philopotamidae genus; distinguished by genitalic and wing characters. Wormaldia is more species-rich and widely distributed.
• FumontaNearctic Philopotamidae genus; separated from Wormaldia by male genitalic features and distribution patterns.
• SiskoNearctic Philopotamidae genus; distinguished from Wormaldia by specific morphological characters detailed in Nearctic revisions.

• caddisfly
• Trichoptera
• Philopotamidae
• fingernet
• lotic
• aquatic insect
• filter-feeder
• cryptic species
• Alps biogeography

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Revision of the Neotropical species of the caddisfly genus Wormaldia McLachlan (Trichoptera: Philopotamidae)
• The larva of Wormaldia asterusia Malicky 1972 (Trichoptera: Philopotamidae) with notes on its ecology and an update on the Wormaldia of Greece with a larval key for species of the genus
• Revision of the Nearctic species of the caddisfly genus Wormaldia McLachlan (Trichoptera: Philopotamidae)
• Multiple old differentiation centres around the Alps and complex range expansion patterns in a semi-aquatic insect: the phylogeny and biogeography of the Wormaldia occipitalis species complex (Trichoptera)