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a) body segments marked by circular grooves = annulib) metamerism: repetition of organs in segments (metameres/somites)
1) homologous to arthropods 2) evolved independently in vertebrates
c) walls called septa to separate segments4) nervous system more centralized 5) circulatory system more complex6) metanephridium system (true kidney system connected to coelom with
filtration by podocytes7) setae tiny chitinous bristles (except leeches)
a) short setae anchor earthworm segment to prevents slippageb) long setae help aquatic worms swim
8) complete gut
General Annelidan Characteristics
Polychaetamainly marine & usually benthic
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Figure 17.01
Figure 17.03a
-Movement-Respiration-Support/movement
within tubes/burrows
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Figure 17.03d
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Figure 17.04
Figure 17.05
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Figure 17.07
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Figure 17.10
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Figure 17.11
Trochophore Larva
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Oligochaetafreshwater or terrestrial
Figure 17.12a
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Figure 17.12c
Figure 17.12d
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Figure 17.13
Figure 17.14
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Figure 17.15
Figure 17.16
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Figure 17.17g
Figure 17.17
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Figure 17.17a
Figure 17.17b
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Figure 17.17c
Figure 17.17d
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Figure 17.17e
Figure 17.17f
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Figure 17.18
freshwater oligochaetes
Intermediate host for the hydrozoanMyxobolus cerebralis causing