Mudflat Top Shell
Diloma subrostratum
- Usual depth0–1 m
- Water temperature12–18 °C
- Best monthsJanuary, October, and December
- How commonOccasional
Photo credit: (c) Javier, some rights reserved (CC BY), uploaded by Javier · CC BY · iNaturalist
About this species
Diloma subrostratum, common name the mudflat top shell, is a species of small sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Text from the Wikipedia article “Diloma subrostratum”, 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: 63 records
- February: 37 records
- March: 37 records
- April: 50 records
- May: 50 records
- June: 26 records
- July: 29 records
- August: 34 records
- September: 54 records
- October: 69 records
- November: 42 records
- December: 75 records
Depth and water temperature
Depth
Mostly recorded at 0–1 m · Deepest record: 40 m
Water temperature
Recorded in surface water of 12–18 °C
Photos
(c) Auckland War Memorial Museum, some rights reserved (CC BY), uploaded by Auckland War Memorial Museum · CC BY · iNaturalist 
(c) Auckland War Memorial Museum, some rights reserved (CC BY), uploaded by Auckland War Memorial Museum · CC BY · iNaturalist 
(c) Saryu Mae 前 朝琉, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Javier, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Javier, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Julia Palmer, some rights reserved (CC BY) · CC BY · iNaturalist
Names and classification
- English
- Mudflat Top Shell
Other scientific names: Chlorostoma undulosum, Diloma plumbea, Labio corrosa, Labio hectori, Labio pica, Monodonta subrostrata, Trochus attritus, Trochus novaezelandiae, Zediloma (Fractarmilla) corrosa
Similar species
Scorched monodontDiloma aethiops
Speckled PeriwinkleDiloma concameratum
Knobbed Top SnailDiloma bicanaliculatum
Bluish Top ShellDiloma nigerrimum
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).
- 505 open-data records from 1927 to 2023.
- Species data updated November 2, 2026.
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