The presence or absence of tolerant and intolerant types can indicate the condition of the stream. The first group are organisms that are completely intolerant of pollution. Macroinvertebrates have a wide range of pollution tolerances and can be classified into three groups. mayflies, stoneflies, caddisflies Group 2 – somewhat pollution tolerant Ex. Family: Brachycentridae, Humpless Casemakers. Group 1: Ve Intolerant Stonefly Nymph Alderfly Nymph Dobsonfly Larva Snipe Fly Larva Mayfly Nymph Riffle Beetle Caddisfly Larva Water Penny Snails (right coiled) Group 2: Group 3: Moderatel Intolerant Fairl Tolerant Pollution Intolerant (High Quality Group) Somewhat Pollution Tolerant (Middle Quality Group) Water Penny Beetle: Flat saucer-shaped body, 6 tiny legs and gills on underside, 4-6 mm. The land caddis, Enoicyla pusilla, lives in the damp litter of the woodland floor.In the United Kingdom it is found in and around the county of Worcestershire in oakwoods. Dobsonfly: 6 legs, 8 pairs of feelers and gill tufts on Common Name: Humpless Case-Maker Caddisflies Feeding Group: Collector/Filterers, Collector/Gatherers, Shredders Tolerance Value: 1 (Low) Habitat: Humpless case-maker caddisflies live in flowing waters from small springs to large rivers. Special Family of Interest – Hydropsychida e or “Common Netspinner Caddisfly” – do not build cases; they build fine mesh nets to filter food from the water current – are slightly more tolerant to pollution, especially organic wastes or nutrients, which they utilize for food – These include: Mayfly nymphs (Figure 1) Stonefly nymphs ; Caddisfly larvae; Hellgrammites (dobsonfly larvae) Gilled snails; Water pennies ; Adult riffle beetles ... Caddisfly (Trichoptera) taxa richness. Caddisflies have a large range of tolerance to pollution. Family: Brachycentridae, humpless casemakers. Pollution Tolerance: Ranges sensitive to less sensitive Goeridae ... Caddisfly larvae (2-40 mm) inhabit a broad scope of freshwater habitats, including streams, rivers, lakes, and ponds, before undergoing complete metamorphosis (holometabolous metamorphosis) into winged adults. Group 1 - pollution sensitive (require higher DO, neutral pH, cold water) Ex. They are either found on hard substrates such as rocks or logs with their cases attached to the substrate or Moderately Tolerant: Fairly Tolerant: Stonefly Nymph Mayfly Nymph Caddisfly Larvae Dobsonfly Larvae Riffle Beetle Water Penny Right-handed Snail: Damselfly Nymph Dragonfly Nymphs Sowbug Scud Crane Fly Larvae Clams Mussels: Midges Black Fly Larvae Leech Planaria # of taxa Benthic macroinvertebrates are sensitive … GROUP 1 — Very Intolerant of Pollution 2 tails 10 ng antennae Stonefly Nymph 3 tails fluttering gi//s Mayfly Nymph ve small hard shell Riffle Beetle Adult Larva botto m looks like a suction cup Penny Larva makes a case from twigs, rocks, leaves Caddisfly Larva Water Right- Handed Snail must be alive to coun t large head & 2 pinchers Dobsonfly Caddisfly: 6 hooked legs on upper body, 2 hooks on end, may have stick, rock or leaf case, 2-40 mm in length. scuds, dragonflies, damselflies Group 3 - pollution tolerant (can tolerate low oxygen, lower/higher … Macroinvertebrate Pollution-Tolerance Index " Exm0LE* Place a check mark next to each type of organism that is present at the site. Distribution. Some insects are tolerant of pollution, whereas others are not. Size: 0.2-0.5 inch (6-12 mm). Habitat & Habits: Brachycentrid larvae live in streams and build cases which are either 4-sided and like a log-cabin or are cylindrical.Larvae creep around, often clinging to woody debris in the stream. They are associated with bodies of freshwater, the larvae being found in lakes, ponds, rivers, streams and other water bodies. Pollution Tolerance. Caddisflies are found worldwide, with the greater diversity being in warmer regions. Order: Trichoptera, the caddisflies. The EPT Index is a versatile index because of certain characteristics of benthic macroinvertebrates. Class: Insecta. POLLUTION TOLERANCE: Very Sensitive: Somewhat Sensitive: Facultative: Somewhat Tolerant: Very Tolerant: Most: Most: Some: Some : Pollution Indicator: One of the 'EPT ' groups (Trichoptera) commonly used as indicators of good water quality ... 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