WoRMS - World Register of... www.marinespecies.org

Shell Encyclopedia - Worms... www.conchology.be

Ars Interpres Publications www.arsint.com

Ars Interpres Publications www.arsint.com

Opalia (gastropod) -... en.wikipedia.org

Ars Interpres Publications www.arsint.com

EPITONIIDAE - Gastropods by... conchology.be

220px- ... ceb.wikipedia.org

EPITONIIDAE - Gastropods by... conchology.be

Genus Opalia · iNaturalist... inaturalist.nz

EPITONIIDAE - Gastropods by... conchology.be

EPITONIIDAE - Gastropods by... conchology.be

Opalia Dentiscala crenulata... www.arsint.com

Genus Opalia · iNaturalist... inaturalist.nz

EPITONIIDAE - Gastropods by... conchology.be

Opalia wroblewskyi... www.reeflex.net

EPITONIIDAE - Gastropods by... conchology.be

Ars Interpres Publications www.arsint.com

Genus Opalia · iNaturalist... uk.inaturalist.org

Garcia, Emilio Fabian.... www.biodiversitylibrary.org...