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Coleoptera

Coleoptera. ~ 5,000 aquatic beetles worldwide. Most live in substrate:. Adults usually leave water temporarily - dispersal. One time - Elmidae (riffle beetles) Several times - Dytiscidae, Hydrophilidae. Respiration?. 1. Self-contained air reserves (Dytiscidae - diving beetle)

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Coleoptera

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  1. Coleoptera ~ 5,000 aquatic beetles worldwide

  2. Most live in substrate: • Adults usually leave water temporarily - dispersal. • One time - Elmidae (riffle beetles) • Several times - Dytiscidae, Hydrophilidae

  3. Respiration? • 1. Self-contained air reserves (Dytiscidae - diving beetle) • 2. Transcuticular respiration (gills in larvae) • 3. Plastron respiration (adult Dryopidae) • 4. Piercing plant tissues (larval Chrysomelidae) Slender antennae Hind coxae extend posteriorly divide first abdominal segment Swimming hairs on legs

  4. Respiration? • 1. Self-contained air reserves (Dytiscids) • 2. Transcuticular respiration (gills in larvae) • 3. Plastron respiration (adult Dryopidae) • 4. Piercing plant tissues (larval Chrysomelidae)

  5. Respiration? • 1. Self-contained air reserves (Dytiscids) • 2. Transcuticular respiration (gills in larvae) • 3. Plastron respiration (adult Dryopidae) • 4. Piercing plant tissues (larval Chrysomelidae) Long toed water beetles Woolly hairs except last abdominal segment Short antennae

  6. Respiration? • 1. Self-contained air reserves (Dytiscids) • 2. Transcuticular respiration (gills in larvae) • 3. Plastron respiration (adult Dryopidae) • 4. Piercing plant tissues (larval Chrysomelidae)

  7. Varied life histories • Some larvae occur year round, adults for short period (Psephenidae) Water pennies Larvae are aquatic, adults terrestrial

  8. Varied life histories • Others occur as larvae and adults year round – Elmidae = riffle beetles Long antennae 5-segmented tarsi Crawl on bottom - do not swim = no swimming hairs on hind legs 5-6 abdominal segments

  9. Varied life histories • Others have long adult; larva only around a few weeks - Hydrophilidae • Water scavenger beetles Adult 3 segmented club antennae 5 segmented tarsi Larvae Large mandibles 4 segmented legs

  10. Adults = terrestrial! Scirtidae = marsh beetles • Small (5 - 15 mm) • Larvae have long antennae • 4-segmented legs, single claw

  11. Beetle pupae are mostly terrestrial • Under stones or logs • Few marine beetles - substrate dwellers

  12. Larval morphology = diverse • Sclerotized head capsule • Mandibles, maxillae, labium • Gill-like appendages in some (Gyrinidae = whirligig beetles)

  13. Coleoptera

  14. Coleoptera

  15. Coleoptera

  16. Coleoptera

  17. The key 2 compound eyes that appear to be divided = Gyrinidae, whirligig beetles

  18. Eyes not divided, hind coxae divided into plates that cover abdominal segments 1-2, or 3 • Haliplidae, crawling water beetles

  19. Hind coxae not expanded into plates, divide abdominal segment 1 • Dytiscidae, predaceous diving beetles

  20. Hind coxae not dividing abdominal segment 1, antennae clubbed with cuplike segment at base • Hydrophilidae, water scavenger beetles

  21. Antennae short with comb-like club, body length 5-6.5 mm • Dryopidae, long-toed water beetles

  22. Antennae w/o comblike club, body length < 4.5 mm Elmidae, riffle beetles

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