Purple-ringed Bluntnose
Samla riwo
- Usual depth5–21 m
- Water temperature20–30 °C
- Best monthsApril, October, and November
- How commonRare
Photo credit: (c) Georgina Jones, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist
About this species
Samla riwo is a species of sea slug, an aeolid nudibranch, a marine heterobranch mollusc in the family Samlidae.
Text from the Wikipedia article “Samla riwo”, licensed CC BY-SA 4.0. Read the article
Where and when
Where it has been recorded
Worldwide
Loading the map
Best months
Worldwide (open data)
- January: 42 records
- February: 39 records
- March: 43 records
- April: 56 records
- May: 33 records
- June: 21 records
- July: 28 records
- August: 39 records
- September: 24 records
- October: 51 records
- November: 54 records
- December: 43 records
Depth and water temperature
Depth
Mostly recorded at 5–21 m · Deepest record: 33.5 m
Water temperature
Recorded in surface water of 20–30 °C
Photos
(c) Georgina Jones, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist 
(c) Ben Costamagna, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Dan Schofield, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Gregor Bailar, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Gregor Bailar, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Jay Paroline, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Tom Heijnen, some rights reserved (CC BY) · CC BY · iNaturalist
Names and classification
- English
- Purple-ringed Bluntnose
Names in 2 more languages
- French
- Flabelline de Riwo
- Japanese
- ハクテンミノウミウシ
Other scientific names: Flabellina riwo
Similar species
Two-tone BluntnoseSamla bicolor
Red-ringed BluntnoseSamla bilas
- Orange-tipped Bluntnose
Samla macassarana
Sources and credits
Names and taxonomy: WoRMS (CC BY 4.0) and the GBIF Backbone (CC BY 4.0). Photos: iNaturalist observers, each under the licence shown (CC0, CC BY or CC BY-SA).
- Depth, temperature, months and maps: records from OBIS and GBIF under CC0 or CC BY.
- Descriptions: Wikipedia, licensed CC BY-SA, each linked to its article.
- Conservation status as published by GBIF (IUCN Red List).
- 260 open-data records from 1986 to 2026.
- Species data updated October 26, 2026.
Log what you see on your next dive
The free DiveHive diver app keeps your logbook with every sighting and shows what lives at the site you dive next.