Florent's Guide To The

Tropical 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)
   └Nudibranchia (Order)
    └Cladobranchia (Suborder)
     └Aeolidioidea (Superfamily)
      └Facelinidae (Family)
       └Pteraeolidia (Genus)

Sea Slugs
Aeolid Nudibranchs

Blue Dragon Nudibranch

Desirable Flabellina

Purple-Ring Nudibranch

Redline Flabellina

Flabellina engeli

Blue Glaucus

Yellow-Tipped Phyllodesmium

Kabira Phyllodesmium

Solar-Powered Phyllodesmium

Great Phyllodesmium

Eubranchus mandapamensis

Ocellated Eubranchus

Eubranchus sp. 1

Eubranchus sp. 2

Red-Speckled Eubranchus

Bicolor Flabellina

Mournful Phestilla

Trinchesia sp. 1

Blue-Banded Trinchesia

Antonietta sp. 1

Indian Caloria

Cratena affinis

Red-Spotted Facelinid

Ringed Favorinus

Brock's Moridilla

Noumeaella sp. 1



All Photographs
© 2025 Florent Charpin