BIOL 2003 Lecture Notes - Lecture 8: Clitellata, Symmetry In Biology, Parapodium
8 Jan 2018
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Clade errantia (not pleistoannelida: motile polychaetes (many long hairs) (defined parapodia since they are swimming in ocean, mostly marine, well-developed sense organs (since they"re carnivorous) and cephalization (head first movement, external fertilization with trochophore larvae. Clade sedentaria: contains the "former, tube-dwelling and burrowing polychaetes, oligochaetes and hirudinidans, pogonophora, echiura, modified heads for filter feeding or particle feeding (since eating in sediments, or reduced heads for deposit feeding xxx. Sedentaria polychaetes: cilia and mucus and food grooves on tentacles for food capture, reduced parapodia: respiration; or separate gills, reduced setae: anchor into burrows and tubes, tube dwellers: calcareous, mucus, sand grains. "beard worms" discovered in 20th century: ~150 deep sea species often in unique ecosystems: chitinous tubes, no mouth or digestive system, absorption, chemoautotrophic bacteria that use h2s, hydrothermal vents, deep sea, develop root like structures into bones. "spoon worms", ~150 species, spoon= flattened, extensible proboscis.
