Try watching
General biology · aquatic insects, no local inventory of species
Small shelters underwater
Friganium larvae, or tricopters, live in water; many build shelters with sand or vegetable fragments. They integrate the food chains of rivers and streams, serving as food for fish, birds and amphibians. The Tagis guide highlights its usefulness as ecological indicators. Finding a copy, however, does not alone certify the quality of water. The underwater shelter is just a part of the story. The adult has wings covered with hair, thin antennas, and when he lands, he has wings like a small roof over the body. You may remember a butterfly, but these have scales on their wings. Adult friganiums usually fly at dusk and live near fresh water masses. Nor is there a single menu for all larvae: according to the group, they can consume algae, plants, organic remains or other invertebrates. They are consumers and, at the same time, food from other animals. A food network better describes these relationships than a row with only one food for each species.
Vamos experimentar?
- Observe the water from an accessible and stable margin.
- Look for differences between sand, vegetable remains and small shelters without collecting them.
- If you do not distinguish any, save the question for an accompanying activity.
A proposal to make at your pace, without collecting copies.
Open a história e os seus recursos →Sources of this proposal
- Tagis — Insects in Order, Odonata, dragonflies, dragonflies and friganiums (pp. 39–43 and 74)Consultation/revision: 2026-11-07
My findings
An idea, a drawing or a question to go on.