Florent's Guide To The

Tropical Reefs

Rabbit Sapsucking Slug
Costasiella usagi
Rabbit Sapsucking Slug
Also known as: Rabbit Costasiella
Category: Sap-Sucking Slugs
Scientific Name: Costasiella usagi
Size: Up to 0.4 in. (1 cm)  
Distribution: Indo-West Pacific
Mollusca (Phylum)
└Gastropoda (Class)
 └Heterobranchia (Subclass)
  └Euthyneura (Infraclass)
   └Sacoglossa (Superorder)
    └Costasiellidae (Family)
     └Costasiella (Genus)
      └C. usagi (Species)

Sea Slugs
Sap-Sucking Slugs

Rabbit Sapsucking Slug

Lettuce Sea Slug

Orangemargin Elysia

Ornate Elysia

Ringed Sap-Sucking Slug

White-Bump Thuridilla

Spotted Sapsucking Slug

Yellow-Spotted Thuridilla

Slender Sapsucking Slug

Orange-Edged Sapsucking Slug

Painted Elysia

Splendid Sapsucking Slug

Elegant Sapsucking Slug

Dark-Dotted Mourgona

Leaf Sheep

Purple-Tipped Costasiella

Deceptive Costasiella



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© 2026 Florent Charpin