http://species-identification.org/species.php?species_group=caribbean_diving_guide&id=446

 

http://www.earthlife.net/inverts/porifera.html

 

http://www.chesapeakebay.net/fieldguide/critter/boring_sponge

 

http://www.sms.si.edu/irlspec/Cliona_spp.htm

 

http://www.mesa.edu.au/cnidaria/cnidaria03.asp

 

http://www.earthlife.net/inverts/cnidaria.html

 

https://en.wikipedia.org/wiki/Flatworm

 

"Unit 3 - Animals." Life IScience. Students ed. New York: Glencoe/McGraw-Hill Education, 2012. 374-98. Print.

 

http://kids.sandiegozoo.org