March 3, 2026

Food items of larvae of Rimanella arcana (Needham, 1933) (Odonata: Amphipterygidae) in Central Amazonia, Brazil

Key Points

Rimanella arcana larvae primarily consume Diptera, specifically Simuliidae and Chironomidae, making up 83.3% and 61.1% of their diet.
Stomach content analysis was conducted on 39 larvae, revealing diverse taxa beyond the dominant Diptera families.
The study highlights the notable presence of various insects including Trichoptera and Ephemeroptera in the larvae's diet.
Results suggest a strong link between larval feeding patterns and the abundance of prey taxa in their habitat.

Abstract

The objective of the present study was to determine the prey of R. arcana larvae by means of stomach content analyses. A total of 39 larvae were dissected; three of them (7.7%) had empty stomachs. The following taxa were present in the stomach content of R. arcana: Diptera: Simuliidae (83.3%), Chironomidae (61.1%), Empididae (5.6%); Trichoptera: Hydroptilidae (19.4%), Hydropsychidae (8.3%); Ephemeroptera: Baetidae (8.3%); Lepidoptera: Crambidae (2.8%) and Acarina (5.6%). Simuliidae and Chironomidae were the most frequent food items of R. arcana larvae, and both families also were the most abundant in the riffles and waterfalls of the study area.

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Authors

Neusa Hamada

Sebastião José de Oliveira

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Food items of larvae of Rimanella arcana (Needham, 1933) (Odonata: Amphipterygidae) in Central Amazonia, Brazil

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Abstract

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