Anilao — 1 February 2026
- Location seen
- Anilao, Philippines
- Date seen
- 2026-02-01
Costasiella usagi
Rabbit Sapsucking Slug
Costasiella usagi© Andrew Grundy / MacroDivers.com
About this species
- Current scientific name
- Costasiella usagi
- Common name
- Rabbit Sapsucking Slug
- Order
- Sapsucking slugs (Sacoglossa)
- Type
- N/A
- ID confidence
- Confirmed
- Genus
- Costasiella
- Species
- usagi
- Average size
- 10 mm
- Colours
- white, black
- Pattern
- Stripes
- Body shape
- Oval
- Rhinophores
- Smooth
- Gills
- Cerata
- Similar species
- All the costasiellas
Geographic Distribution
Western Pacific Ocean.
Identification
Very small slug with leaf-like cerata. The face is white the rhinophores black. The cerata have white lines. Rhinophores simple, smooth and non-retractable.
Behaviour / Habitat
Normally found on Avrainvillea a type of algae with a large plate shaped blade on a stalk emerging from the sea floor
Our Sightings
Lembeh — 14 September 2025
- Location seen
- Lembeh, Indonesia
- Date seen
- 2025-09-14
About our records
All sightings and photographs on this page are from our own dives. Locations shown are places where we have personally recorded this species. About MacroDivers.