Lembeh — 27 August 2026
- Location seen
- Lembeh, Indonesia
- Date seen
- 2026-08-27
Costasiella sp 3
© Di Syrett / MacroDivers.com
About this species
- Current scientific name
- Costasiella sp 3
- Order
- Sapsucking slugs (Sacoglossa)
- Type
- N/A
- ID confidence
- Probable
- Genus
- Costasiella
- Species
- sp 3
- Colours
- white, black, purple, pink, green
- Body shape
- Oval
- Rhinophores
- Smooth
- Gills
- Cerata
- Similar species
- Costasiella kuroshimae
Geographic Distribution
Western Pacific with sightings in Indonesia, the Philippines and Papua New Guinea.
Identification
Very cute Sacoglossa (sapsucking slug). Body is white, the plump cerata are green with pink or purple tips. It has black eyes and black tips to the rhinophores. The white face has distinct pink cheeks which was the local name for this slug. Varies between 4 and 12mm long.
Behaviour / Habitat
This 'Shaun the Sheep' feeds on the same green alga that the official 'Shaun' - Costasiella kuroshimae feeds on. So they may be seen together.
General Notes
Undescribed sapsucking slug. This species is not in the book - Sea Slugs and Nudibranch Identification. It was identified as Costasiella sp 3 by Sea Slug World.
Our Sighting
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.