Florent's Guide To The

Tropical Pacific Reefs

Deceptive Costasiella
Costasiella sp. 2
Deceptive Costasiella
Category: Sap-Sucking Slugs
Scientific Name: Costasiella sp. 2
Size: Up to 0.4 in. (1 cm)  
Distribution: Indonesia, Philippines
Mollusca (Phylum)
└Gastropoda (Class)
 └Heterobranchia (Subclass)
  └Euthyneura (Infraclass)
   └Sacoglossa (Superorder)
    └Costasiellidae (Family)
     └Costasiella (Genus)

Sea Slugs
Sap-Sucking Slugs

Deceptive Costasiella

Elegant Sapsucking Slug

Dark-Dotted Mourgona

Orangemargin Elysia

Ringed Sap-Sucking Slug

White-Bump Thuridilla

Slender Sapsucking Slug

Yellow-Spotted Thuridilla

Orange-Edged Sapsucking Slug

Splendid Sapsucking Slug

Leaf Sheep

Purple-Tipped Costasiella



All Photographs
© 2025 Florent Charpin