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Higher invertebrates

Higher invertebrates. P. Mollusca. clams, oysters, scallops, abalone, squid, octopus, snails Body plan—head, foot (classified by this), visceral mass w/ organs (digestive, circulatory, reproductive) Many have shell (secreted by mantle) Gills to obtain oxygen from water. Class Gastropods.

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Higher invertebrates

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  1. Higher invertebrates

  2. P. Mollusca • clams, oysters, scallops, abalone, squid, octopus, snails • Body plan—head, foot (classified by this), visceral mass w/ organs (digestive, circulatory, reproductive) • Many have shell (secreted by mantle) • Gills to obtain oxygen from water

  3. Class Gastropods • – “Stomach foot” • limpets, snails, slugs, abalone, whelks, nudibranches • 1 shell (except seahares, one) • radula—tongue w/ teeth • herbivores and eat algae & plants • some are predators (use radula to drill hole in oysters; others poison fish)

  4. Helix aspera (garden snail)

  5. Class Bivalves • clams, oysters, mussels, scallops • 2-part shell • foot used for anchoring and burrowing • does not have a head, radula, or eyes • uses gill for oxygen and filter-feeding

  6. Class Cephalopods (“head foot”) • octopus, squid, nautilus • some have shell • head modified tentacles • radula to draw prey in mouth • beak for crushing prey • advanced eyes (like vertebrates) • most intelligent invertebrates

  7. P. Annelida “segmented worms” • annelida = little rings • earthworms, leeches • marine, fresh water, and land • *advancement—segments (repeating units) and hydrostatic skeleton • setae/bristles for movement • skin breathers (no respiratory system) • well-developed digestive, circulatory, reproductive, and nervous systems

  8. Class Oligochaetes—earthworm • Class Oligochaetes—earthworm • all monoecious • clittelum to make cocoon • digestive tract—mouth, pharynx, esophagus, crop, gizzard, intestine, anus

  9. Class Hirudinea—leeches • fresh water ectoparasites • use suckers to attach to host’s skin and then use jaws and anesthetic • secretion anticoagulant (hirudin) • old remedy—used for blood letting • new remedy—improve healing and circulation after reconnection of appendages

  10. Class polychaeta—“many bristles” • marine • some predators, others filter feeders • head w/ tentacles, eyes, jaws • paired appendages/segment = parapodia “paired feet” • for swimming and burrowing, water circulation

  11. P. Arthropods “jointed foot” • crustaceans, crabs, lobsters, shrimp, arachnids (spiders, ticks, scorpions), insects, centipedes, and millipedes • related by segmentation, exoskeleton, jointed appendages • jointed appendages paired and used for feeding, movement, senses, and reproduction

  12. Class Crustaceans • Daphnia (water flea), pill bugs (land), barnacles, copepods, lobster • 2 pair antenna, carapace (hard exoskeleton), 5 pairs of legs (first pair = claws)

  13. Class Insects • 3 body regions—head, thorax, abdomen • compound eyes, 1 pair antenna/head, 2 pairs wings/thorax • metamorphosis

  14. Class Arachnids • 2 body regions—cephalothorax and abdomen • cephalothorax has several eyes, chelicerae (mouth parts, pincer like or fangs in spiders), sensory pedipalps, 4 pairs of walking legs • spiders have spinneret appendages to weave webs of silk • spiders’ fangs can have venom • no antennae or wings

  15. Sorry but have arachnid phobia. Dangerous ones in USA are recluse and black widow. In memory of Cleo the tarantula who passed away recently this semester.

  16. Class CentipedesClass millipedes • long segmented bodies long segmented bodies • 1 pr legs/segment 2 pr legs/seg. • flat body cylindrical body • aggressive predators scavengers • prey on earthworms • and insects • Venomous fangs/claws

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