Onyx slippersnail

About this species

Crepidula onyx, the onyx slippersnail or onyx slipper snail, is a species of sea snail with gills, a marine gastropod mollusc in the family Calyptraeidae, the slipper snails and cup-and-saucer snails.

Text from the Wikipedia article “Crepidula onyx”, licensed CC BY-SA 4.0. Read the article

Where and when

Where it has been recorded

Worldwide

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Best months

Worldwide (open data)

January: 83 records
February: 75 records
March: 70 records
April: 110 records
May: 91 records
June: 83 records
July: 109 records
August: 70 records
September: 50 records
October: 55 records
November: 59 records
December: 63 records

Depth and water temperature

Depth

Mostly recorded at 0–15 m · Deepest record: 20 m

0–10 m: 20 records
10–20 m: 5 records
20–30 m: 1 records

Water temperature

Recorded in surface water of 13–29 °C

12–14 °C: 4 records
14–16 °C: 4 records
16–18 °C: 50 records
18–20 °C: 212 records
20–22 °C: 2 records
22–24 °C: 14 records
24–26 °C: 17 records
26–28 °C: 6 records
28–30 °C: 4 records

Photos

(c) Dan Killam, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Gavin Skeen, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Parsa Fard, some rights reserved (CC BY) · CC BY · iNaturalist
(c) mister_bumble, some rights reserved (CC BY) · CC BY · iNaturalist
(c) CK2AZ, some rights reserved (CC BY) · CC BY · iNaturalist
(c) mister_bumble, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Parsa Fard, some rights reserved (CC BY) · CC BY · iNaturalist

Names and classification

English: Onyx slippersnail, onyx slippersnail

Names in 3 more languages

Japanese: シマメノウフネガイ
Korean: 뚱뚱이짚신고둥
Simplified Chinese: 拖鞋舟螺, 指甲履螺

Other scientific names: Calyptraea amygdalus, Crepidula rugosa

Similar species

Spiny Slipper Shell
Bostrycapulus aculeatus
Bostrycapulus gravispinosus
Bostrycapulus pritzkeri

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).
1,311 open-data records from 1902 to 2021.
Species data updated November 1, 2026.