Granular Frog Shell

Dulcerana granularis

Molluscs
IUCN: Not evaluated

Usual depth1–51 m
Water temperature19–30 °C
Best monthsJuly
How commonOccasional

Photo credit: (c) Lisa Bennett, some rights reserved (CC BY) · CC BY · iNaturalist

About this species

Dulcerana granularis, common name the granular frog shell, is a species of medium-sized sea snail, a marine gastropod mollusk in the family Bursidae, the frog shells.

Text from the Wikipedia article “Dulcerana granularis”, 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: 39 records
February: 28 records
March: 36 records
April: 44 records
May: 44 records
June: 53 records
July: 104 records
August: 55 records
September: 38 records
October: 50 records
November: 51 records
December: 33 records

Depth and water temperature

Depth

Mostly recorded at 1–51 m · Deepest record: 387.5 m

0–10 m: 77 records
10–20 m: 65 records
20–30 m: 43 records
30–40 m: 27 records
40–50 m: 17 records
50–60 m: 18 records
60–70 m: 6 records
70–80 m: 3 records
80–90 m: 1 records
90–100 m: 1 records
100–110 m: 3 records
110+ m: 6 records

Water temperature

Recorded in surface water of 19–30 °C

18–20 °C: 5 records
20–22 °C: 19 records
22–24 °C: 50 records
24–26 °C: 223 records
26–28 °C: 219 records
28–30 °C: 158 records

Photos

(c) Takaaki Hattori, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Liliana Ramírez-Freire, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Greg Tasney, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist
(c) Robin White, some rights reserved (CC BY) · CC BY · iNaturalist
no rights reserved · CC0 1.0 · iNaturalist
no rights reserved · CC0 1.0 · iNaturalist
(c) Tim, some rights reserved (CC BY) · CC BY · iNaturalist

Names and classification

English: Granular Frog Shell

Names in 4 more languages

Spanish: Caracol rana
Japanese: イワカワウネボラ
Thai: หอยสังข์กบเม็ดทราย
Simplified Chinese: 果粒蛙螺

Other scientific names: Biplex rubicola, Bursa alfredensis, Bursa cumingiana, Bursa granifera, Bursa granularis, Colubrellina granularis, Dulcerana alfredensis, Ranella granifera, Tritonium granulare, Tritonium jabick

Similar species

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).
1,484 open-data records from 1798 to 2023.
Species data updated October 26, 2026.

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