http://www.seaslugforum.net/showall/costsp1
http://www.seaslugforum.net/showall/costsp2
http://www.cosmos.ne.jp/~ononini/seaslug_addenda3/add3_01.html
http://rfbolland.com/okislugs/cost_sp1.html
http://rfbolland.com/okislugs/cost_2.html
http://www.umiushi.info/photo_species/photo_splist_eng.php?sopt=0&loc=0000
http://www.seaslugforum.net/showall/costsp3
http://www.medslugs.de/E/Pac-NW/Costasiella_sp_01/Selection.htm
http://rfbolland.com/okislugs/cost_sp2.html
http://www.medslugs.de/E/Ind-E/Costasiella_sp_02/Selection.htm
http://rfbolland.com/okislugs/cost_sp3.html
http://www.medslugs.de/E/Ind-E/Costasiella_sp_01/Selection.htm
http://www.seaslugforum.net/showall/costsp4
http://www.underwaterkwaj.com/nudi/sacoglossans/e150.htm
http://www.underwaterkwaj.com/nudi/sacoglossans/e534.htm
http://www.seaslugsofhawaii.com/species/Costasiella-sp1-a.html
http://www.Philippine-Sea-Slugs.com/Sacoglossa/Costasiella_sp_01.htm
http://www.nudipixel.net/species/costasiella_sp/
http://sacoglossa.lifedesks.org/pages/34486
http://sacoglossa.lifedesks.org/pages/34487
http://sacoglossa.lifedesks.org/pages/34488
http://sacoglossa.lifedesks.org/pages/34489
http://www.medslugs.de/E/Ind-E/Costasiella_sp_01.htm
http://www.medslugs.de/E/Ind-E/Costasiella_sp_02.htm
http://www.medslugs.de/E/Ind/Costasiella_sp_03/Selection.htm
http://tahitinudi.jimdo.com/liste-des-espèces/costasiella-sp-1/
http://tahitinudi.jimdo.com/liste-des-espèces/costasiella-sp-2/
http://marliwakeling.jalbum.net/Nudibranchs/slides/Costasiella sp. 1.html
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=102
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=103
http://www.medslugs.de/E/Ind-E/Costasiella_sp_04/Selection.htm
http://tahitinudi.jimdo.com/liste-des-espèces/costasiella-sp-3/
http://tahitinudi.jimdo.com/liste-des-espèces/costasiella-sp-4/
http://tahitinudi.jimdo.com/liste-des-espèces/costasiella-sp-5/
http://www.medslugs.de/E/Ind-E/Costasiella_sp_05/Selection.htm
http://slugsite.us/bow2007/nudwk907.htm
http://www.medslugs.de/E/Ind-E/Costasiella_sp_06/Selection.htm
http://www.medslugs.de/E/Pac-W/Costasiella_sp_07/Selection.htm
http://www.medslugs.de/E/Pac-W/Costasiella_sp_01/Selection.htm
http://www.medslugs.de/E/Pac-W/Costasiella_sp_08/Selection.htm
http://www.medslugs.de/E/Pac-W/Costasiella_sp_09/Selection.htm
http://www.medslugs.de/E/Pac/Costasiella_sp_01/Selection.htm
http://www.medslugs.de/E/Ind-E/Costasiella_sp_10/Selection.htm
http://www.medslugs.de/E/Pac-W/Costasiella_sp_10/Selection.htm
http://www.medslugs.de/E/Pac-W/Costasiella_sp_11/Selection.htm
http://slugsite.us/bow2007/nudwk1076.htm