Black-horned Egg-eater
Favorinus tsuruganus
- Usual depth7–22 m
- Water temperature19–30 °C
- Best monthsMarch, April, and August
- How commonOccasional
Photo credit: (c) Georgina Jones, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist
About this species
Favorinus tsuruganus is a species of aeolid nudibranch, a sea slug. It is a marine gastropod mollusk in the family Facelinidae.
Text from the Wikipedia article “Favorinus tsuruganus”, 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: 58 records
- February: 54 records
- March: 97 records
- April: 137 records
- May: 87 records
- June: 39 records
- July: 75 records
- August: 96 records
- September: 66 records
- October: 51 records
- November: 77 records
- December: 46 records
Depth and water temperature
Depth
Mostly recorded at 7–22 m · Deepest record: 30.5 m
Water temperature
Recorded in surface water of 19–30 °C
Photos
(c) Dan Schofield, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Gregor Bailar, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Georgina Jones, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist 
(c) Dan Schofield, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Bernard Picton, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) 呂一起(Lyu yi-chi), some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Gregor Bailar, some rights reserved (CC BY) · CC BY · iNaturalist
Names and classification
- English
- Black-horned Egg-eater
Names in 2 more languages
- Japanese
- ツルガチゴミノウミウシ
- Simplified Chinese
- 敦賀灰翼海蛞蝓
Similar species
White-diamond Egg-eaterFavorinus japonicus
Miraculous Egg-eaterFavorinus mirabilis
Sunrise Tentacle AeolidCaloria indica
Australian Blue DragonPteraeolidia ianthina
Lion Tentacle AeolidCratena simba
Orange-maned Bead-noseMoridilla brockii
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).
- 284 open-data records from 1982 to 2026.
- Species data updated October 26, 2026.
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