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Marine Ecology, April 25, 2007

Marine Ecology, April 25, 2007. Intertidal organisms 3: Phylum Arthropoda. Phylum Arthropoda. Major arthropod features Body segementation/specialization of regions Paired, jointed appendages Exoskeleton Several non-living layers of cuticle, secreted by the epidermis Contains chitin

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Marine Ecology, April 25, 2007

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  1. Marine Ecology, April 25, 2007 Intertidal organisms 3: Phylum Arthropoda

  2. Phylum Arthropoda • Major arthropod features • Body segementation/specialization of regions • Paired, jointed appendages • Exoskeleton • Several non-living layers of cuticle, secreted by the epidermis • Contains chitin • Cuticle also forms mouthparts, lining of digestive tract, eye lens, and wings.

  3. Phylum ArthropodaSubphylum Crustacea features • Two pairs of antennae; 3 pairs of mouthparts • Compound eyes, sometimes on stalks • Body regions: • Head and thorax often  "cephalothorax“ • Abdomen • Thoracic appendages (always) • Abdominal appendages (in some) • Often have calcium carbonate in cuticle • Many have gills • Often attached to base of legs, extend into thorax.

  4. Other concepts/terms • Thoracic appendages: walking legs and/or food handling • Abdominal appendages sometimes modified as "pleopods", broad swimming appendages. • Very end of abdomen in many: • Telson • Uropods

  5. Reproduction • Mating varies: • Males provide females with spermatophores • Sperm storage occurs in some. • Brooding of eggs/young • Some with direct development • Many with pelagic larvae • female releases fertilized eggs or • Females release larval forms

  6. Order Amphipoda(Beachhopper)

  7. Order Isopoda Idotea sp. Ligiapallasii

  8. Order Decapoda • Carapace covers head and thorax • Eight pairs of thoracic appendages • 3 pairs assist with food handling (maxillopeds) • In addition to the three pairs of mouthparts • 5 pairs as walking legs (includes chelipeds)

  9. Order Decapoda Petrolisthes spp. Pagurus sp. Pachychelis rudis *Add me to your list!

  10. Shore crabs Hemigrapsus nudus Pachygrapsus crassipes Hemigrapsus oregonensis

  11. Cancer sp. crabs C. antennarius C. productus C. magister C. oregonensis

  12. Reproduction: Cancer spp.

  13. Reproduction

  14. Pugettia producta: shield-backed kelp crab

  15. Order Cirripedia • “Test”: barnacle’s calcareous plates • Moveable valves allow opening, closing • Test is in addition to exoskeleton • Filter-feeds with thoracic appendages • No abdomen • Reduced head

  16. Order Cirripedia: the barnacles Balanus, Semibalanus sp. Pollicipes polymerus Chthamalus sp.

  17. Cirripedia: life cycle http://www.jst.go.jp/erato/project/fck_P/icons/grf1_1.jpg

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