Florent's Guide To The Hawaiian, South Pacific and

Indo-Pacific Reefs

Slender Sapsucking Slug
Thuridilla gracilis
Slender Sapsucking Slug
Category: Sap-Sucking Slugs
Scientific Name: Thuridilla gracilis
Size: Up to 2 in. (to 5 cm)  
Depth: 3-50 ft. (1-15 m)
Distribution: Indo-West Pacific
T. gracilis is a species complex
Mollusca (Phylum) Mollusks
└Gastropoda (Class) Gastropods
 └Heterobranchia (Subclass) Heterobranchs
  └Euthyneura (Infraclass)
   └Sacoglossa (Superorder) Sap-Sucking Slugs
    └Plakobranchidae (Family)
     └Thuridilla (Genus)
      └T. gracilis (Species)
WoRMS ID: 494494🔗
iNaturalist ID: 194607🔗

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© 2026 Florent Charpin