Florent's Guide To The

Hawaii Reefs

Blue Dragon Nudibranch
Pteraeolidia semperi
Blue Dragon Nudibranch
Category: Aeolid Nudibranchs
Scientific Name: Pteraeolidia semperi
Size: 1 to 5 in. (2.5 to 12 cm)  
Depth: 10-100 ft. (3-30 m)
Distribution: Indo-Pacific, Hawaii
Note: Possibly a complex of species. Often misidentified as P. ianthina, a temperate Australian species.
Mollusca (Phylum)
└Gastropoda (Class)
 └Heterobranchia (Subclass)
  └Euthyneura (Infraclass)
   └Nudipleura (Superorder)
    └Nudibranchia (Order)
     └Aeolidina (Suborder)
      └Aeolidioidea (Superfamily)
       └Facelinidae (Family)
        └Pteraeolidia (Genus)
         └P. semperi (Species)

Sea Slugs
Aeolid Nudibranchs

Blue Dragon Nudibranch

Desirable Flabellina

Blue Glaucus

Bicolor Flabellina

Indian Caloria



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© 2025 Florent Charpin