This quarter we started to look at invertebrates in the ocean. We learned about the different phylums, which would be Porifera, Cnidaria, Platyhelminthes, Annelida, Mollusca, Arthropoda, and Echinodermata, and had to make a book on them. Porifera don't have any classes, but they are sponges. Cnidaria has three classes: Anthozoa (coral reefs, sea fans, sea pens, and sea anemones), Scyphozoa (jellyfish), and Hydrozoa. Platyhelminthes has three classes too: Trematoda (flukes), Cestoda (tapeworms), and Turbellaria (flatworms). Annelida also has three classes: Trematoda (clamworms, sandworms, and tubeworms), Oligochaetes (earthworms), and Hirndinea (leeches). Mollusca has three: bivalvia (clams, scallops, mussels, and oysters), Cephalopoda (octopus, squid, cuttlefish, and nautilus), and Gastropoda (snails and slugs). Arthropoda has Crustacea (crabs, shrimps, crayfish, and lobsters), Merostomata (horseshoe crab), Pycnogonida (sea spider). Echinodermata has four classes: Asteroidea (sea stars), Echinoidea (sea urchins, sand dollars, and heart urchins), Holothuroidea (sea cucumbers), Ophiuroidea (brittle stars). We dissected some cool stuff but Troy was too scared to. We colored a bunch of worksheets and cleaned our fish tanks a lot. Ours is really gross right now since nobody cleaned it over the break and all. It looks like one of our fish is pregnant but it hasn't had babies yet.
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