Ochrotrichiinae

microcaddisflies

Genus Guides

Dibusa(microcaddisfly)
Metrichia
Ochrotrichia(microcaddisfly)

Ochrotrichiinae is a of microcaddisflies within the Hydroptilidae, comprising approximately 430 across nine . The subfamily is most diverse in the Neotropics, with additional representation in the Nearctic and Australasian regions, including an genus in New Caledonia. Phylogenetic analyses support its monophyly with the exclusion of Dibusa. The subfamily originated in the New World during the early Cretaceous, approximately 116 million years ago, with subsequent to Australasia via trans-Antarctic routes.

Pronunciation

How to pronounce Ochrotrichiinae: /ˌɒkroʊˌtrɪkiˈaɪniː/

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Identification

Identification relies heavily on male genitalia , particularly the configuration of X (divided or undivided), shape of inferior appendages, and structure of tergum IX. For example, the O. aldama Group is characterized by divided tergum X. Antennal structure, setal warts, and wing venation may assist in distinguishing and species when genitalic characters are examined together.

Habitat

Freshwater aquatic environments associated with running waters; larvae occupy lotic typical of Hydroptilidae. Specific microhabitat preferences within this are not documented.

Distribution

Primarily Neotropical, with highest diversity in South America (Peru: 56 ; Brazil: Atlantic Forest region). Present in Nearctic and Australasian regions. Caledonotrichia is to New Caledonia. Ancestral distribution reconstructed as New World.

Similar Taxa

StactobiinaeDibusa was historically placed in Ochrotrichiinae but molecular and morphological analyses recover it within Stactobiinae; this distinction is critical for accurate assignment.

More Details

Phylogenetic position

Monophyly of Ochrotrichiinae is strongly supported by Bayesian inference and Maximum likelihood analyses when Dibusa is excluded. The diverged from other hydroptilid lineages approximately 116 Ma in the early Cretaceous.

Historical biogeography

The Australian lineage, including Caledonotrichia and Maydenoptila, likely resulted from trans-Antarctic with divergence from Ochrotrichia estimated at approximately 98 Ma. Caledonotrichia diversified in New Caledonia around 51 Ma, coinciding with re- of Grande Terre.

Taxonomic activity

Recent descriptions indicate high undiscovered diversity: ten new from Peru (2022), two new species from Atlantic Forest, Brazil (2022). Peru now has 56 recorded species of Ochrotrichiinae.