Bat-wing Seaslug

Where and when

Where it has been recorded

Worldwide

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Best months

Worldwide (open data)

January: 31 records
February: 32 records
March: 45 records
April: 49 records
May: 50 records
June: 34 records
July: 21 records
August: 20 records
September: 16 records
October: 16 records
November: 24 records
December: 25 records

Depth and water temperature

Depth

Mostly recorded at 5–20 m · Deepest record: 25 m

0–10 m: 38 records
10–20 m: 103 records
20–30 m: 18 records

Water temperature

Recorded in surface water of 16–29 °C

14–16 °C: 22 records
16–18 °C: 2 records
18–20 °C: 12 records
20–22 °C: 60 records
22–24 °C: 45 records
24–26 °C: 60 records
26–28 °C: 10 records
28–30 °C: 23 records

Photos

(c) Georgina Jones, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist
(c) Mitch Van Dyke, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Kai Squires, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Kai Squires, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Susan Prior, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Eldon E Ball, some rights reserved (CC BY) · CC BY · iNaturalist

Names and classification

English: Bat-wing Seaslug, Ornate Bat-winged Sea Slug

Names in 1 more languages

Japanese: ムラサキウミコチョウ

Similar species

Psychedelic Batwing
Sagaminopteron psychedelicum
Sagaminopteron bilealbum
Sagaminopteron nigropunctatum
Sagaminopteron pohnpei
Siphopteron tigrinum
Doublehorned Batwing Slug
Gastropteron bicornutum

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.
Conservation status as published by GBIF (IUCN Red List).
263 open-data records from 1972 to 2026.
Species data updated October 26, 2026.