Hank introduces us to the “simplest” of the animals, complexity-wise: beginning with sponges (whose very inclusion in the list as “animals” has been called into question because they are so simple) and finishing with the most complex molluscs, octopuses and squid. We differentiate them by the number of tissue layers they have, and by the complexity of those layers.
Table of Contents:
1) Porifera 1:33
2) Cnidaria 2:36
a) Diploblasts 2:48
3) Platyhelminthes 3:33
a) Triploblasts 3:56
b) Coelom 4:36
4) Biolography 5:36
5) Nematoda 7:26
6) Rotifera 7:57
7) Molusca 8:33
References:
http://www.ucmp.berkeley.edu/cnidaria/cnidaria.html http://www.slate.com/articles/health_and_science/science/2008/06/how_smart_is_the_octopus.html
http://en.wikipedia.org/wiki/File:Dicrocoelium_LifeCycle.gif
http://entnemdept.ufl.edu/creatures/nematode/soil_nematode.htm
http://soils.usda.gov/sqi/concepts/soil_biology/nematodes.html
http://www.eurekalert.org/pub_releases/2010-08/uoc–goa080410.php
http://www.ucmp.berkeley.edu/cambrian/cambrian.php
http://www.insidescience.org/news-service/1-2615
http://www.wormbook.org/chapters/www_genomevol/genomevol.pdf
http://www.cartage.org.lb/en/themes/sciences/zoology/animalclassification/Polygenetic/phylogenetictree/phylogenetictree.htm
http://www.esu.edu/~milewski/intro_biol_two/lab_9_porifera_cnidaria/Cnidaria.html
http://comenius.susqu.edu/biol/202/animals/protostomes/default.htm
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