BIO SCI 94 Lecture 20: Deuterosome Animals Part 1
21 Feb 2019
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Includes hagfish, lampreys, cartilaginous, bony fishes, amphibians, mammals, reptiles. Hard protective/supportive structures inside layer of epidermal tissue. During development, secretion of calcium carbonate plates inside skin endoskeleton. Some species, plates fuse form rigid case. Tissue connect plates- stiff or flexible depending on conditions. Series of branching, fluid filled tubes and chambers form hydrostatic skeleton. Use most feeding methods: mass feeding, suspension feeding, deposit feeding. Use tube feet pry apart bivalve shells. Use tube to flick particles to cilia. Sop up food material on substrate with mucus. Move food laden mucus into mouth with tube feet. Most feather stars/sea lilies- sessile suspension feeders. Brittle stars/basket stars- five or more long arms; comes from small central disk. Use arm- suspension feeding, deposit feed, capture prey. Use tentacles- modified tube feet- for : suspension/deposit feed. 1900 known sea star species- live on hard/soft substrates along coast on every ocean. Fully grown sea stars- range: less than 1 cm to 1 m meter across.
