Crustaceans and Echinoderms.

                             Crustaceans.



http://www.waterworxbali.com/Images/Photos/Large/carpilius-maculatus.jpg



http://www.hermitcrabsecrets.com/wp-content/themes/NicheProfitPressV2/images/HermitCrabpic.jpg

http://www.fish-species.org.uk/crustaceans/crustaceans-picture.jpg

Echinoderms.

                                          

http://www.bloggersbase.com/images/uploaded/original/8ba621f689ffbdd7c9388d199f3993e6ff809a9a.jpeg

http://seashellsbymillhill.files.wordpress.com/2011/02/sea-biscuit-sand-dollar-2.jpg

http://www.starfish.ch/Fotos/echinoderms-Stachelhauter/seacucumbers-Seewalzen/Bohadschia-argus1.jpg  

* The similarities between Crustaceans and Echinoderms is that they both have bilateral symmetry when the Echinoderm is in the larvae stage.