I owe a huge debt of gratitude to Dave Behrens and Terry Gosliner for their incredibly helpful assistance in identifying my nudibranch photos. For the vast majority of my photos, they turned my "I think it could possibly be..." into a positive i.d.

Order: CEPHALASPIDEA

Colpodaspis thompsoni Colpodaspis thompsoni	Colpodaspis thompsoni Colpodaspis thompsoni	Hydatina physis Hydatina physis
Hydatina zonata Hydatina zonata	Micromelo barbarae Micromelo barbarae	Bulla ampulla Bulla ampulla
Bulla orientalis Bulla orientalis	Atys naucum Atys naucum	Chelidonura amoena Chelidonura amoena
Chelidonura hirundinina Chelidonura hirundinina	Chelidonura varians Chelidonura varians	Mariaglaja alexisi Mariaglaja alexisi
Mariaglaja inornata Mariaglaja inornata	Biuve cf. fulvipunctata Biuve cf. fulvipunctata	Navanax Navanax inermis
Philinopsis ctenophoraphaga Philinopsis ctenophoraphaga	Philinopsis speciosa Philinopsis speciosa	Philinopsis speciosa Philinopsis speciosa
Spinoaglaja orientalis Spinoaglaja orientalis	Spinophallus falciphallus Spinophallus falciphallus	Tubulophilinopsis pilsbryi Tubulophilinopsis pilsbryi
Tubulophilinopsis pilsbryi Tubulophilinopsis pilsbryi	Tubulophilinopsis pilsbryi Tubulophilinopsis pilsbryi	Tubulophilinopsis reticulata Tubulophilinopsis reticulata
Gastropteron bicornutum Gastropteron bicornutum	Gastropteron multo Gastropteron multo	Sagaminopteron ornatum Sagaminopteron ornatum
Sagaminopteron ornatum Sagaminopteron ornatum	Sagaminopteron psychedelicum Sagaminopteron psychedelicum	Sagaminopteron psychedelicum Sagaminopteron psychedelicum
Sagaminopteron sp. Sagaminopteron sp.	Siphopteron brunneomarginatum Siphopteron brunneomarginatum

Order: SACOGLOSSA

Lettuce Sea Slug Elysia crispata	Hedgpeth's Sea Hare Elysia hedgpethi	Elysia marginata Elysia marginata
Elysia marginata Elysia marginata	Elysia obtusa Elysia obtusa	Elysia pusilla Elysia pusilla
Elysia pusilla Elysia pusilla	Elysia sp. 1 Elysia sp. 1	Elysia sp. 1 Elysia sp. 1
Elysia sp. 1 Elysia sp. 1	Elysia sp. 2 Elysia sp. 2	Elysia sp. 2 Elysia sp. 2
Elysia sp. 3 Elysia sp. 3	Elysia tomentosa Elysia tomentosa	Thuridilla albopustulosa Thuridilla albopustulosa
Thuridilla gracilis Thuridilla gracilis	Thuridilla hoffae Thuridilla hoffae	Plakobranchus ocellatus Plakobranchus ocellatus
Plakobranchus ocellatus (juvenile) Plakobranchus ocellatus	Plakobranchus papua Plakobranchus papua	Plakobranchus sp. Plakobranchus sp.
Lobiger sp. Lobiger sp.	Lobiger sp. Lobiger sp.	Mourgona sp. Mourgona sp.
Mourgona sp. Mourgona sp.	Cyerce elegans Cyerce elegans	Cyerce sp. 1 Cyerce sp. 1
Cyerce sp. 2 Cyerce sp. 2	Polybranchia orientalis Polybranchia orientalis	Costasiella kuroshimae Costasiella kuroshimae
Costasiella kuroshimae Costasiella kuroshimae	Costasiella usagi Costasiella usagi

Order: ANASPIDEA

Aplysia juliana Aplysia juliana	Aplysia nigrocincta Aplysia nigrocincta	Aplysia nigrocincta Aplysia nigrocincta
Aplysia nigrocincta Aplysia nigrocincta	Aplysia oculifera Aplysia oculifera	Aplysia oculifera Aplysia oculifera
Black Sea Hare Aplysia vaccaria	Dolabella auricularia Dolabella auricularia	Dolabella auricularia Dolabella auricularia
Dolabrifera dolabrifera Dolabrifera dolabrifera	Notarchus indicus Notarchus indicus	Notarchus indicus Notarchus indicus
Petalifera ramosa Petalifera ramosa	Stylocheilus striatus Stylocheilus striatus	Stylocheilus striatus Stylocheilus striatus

Order: NOTASPIDEA

Tomoberthella martensi Tomoberthella martensi	Berthella sp. Berthella sp.	Berthellina delicata Berthellina delicata
Berthellina delicata Berthellina delicata	Euselenops luniceps Euselenops luniceps	Euselenops luniceps (juvenile) Euselenops luniceps
Euselenops luniceps Euselenops luniceps	Pleurobranchaea brockii Pleurobranchaea brockii	Pleurobranchus albiguttatus Pleurobranchus albiguttatus
Pleurobranchus forskalii Pleurobranchus forskalii	Pleurobranchus forskalii Pleurobranchus forskalii	Pleurobranchus forskalii Pleurobranchus forskalii
Pleurobranchus grandis Pleurobranchus grandis	Pleurobranchus grandis Pleurobranchus grandis	Pleurobranchus mamillatus Pleurobranchus mamillatus
Pleurobranchus peronii Pleurobranchus peronii	Pleurobranchus peronii Pleurobranchus peronii	Pleurobranchus peronii (juvenile) Pleurobranchus peronii
Pleurobranchus varians Pleurobranchus varians	Pleurobranchus weberi Pleurobranchus weberi	Pleurobranchus weberi Pleurobranchus weberi
Tylodina sp. Tylodina sp.