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Exploring Marine Arthropods and Intertidal Ecology

Discover the fascinating world of intertidal organisms, focusing on Phylum Arthropoda and its subphylum Crustacea. Learn about their unique features, body segmentation, appendages, exoskeleton, and reproductive strategies. Dive into the diverse orders within Arthropoda, from Amphipoda to Decapoda and Cirripedia. Explore their habitats and life cycles in the dynamic intertidal zone.

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Exploring Marine Arthropods and Intertidal Ecology

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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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