Speckled Periwinkle
Diloma concameratum
- Usual depth0 m
- Water temperature14–24 °C
- Best monthsJanuary, April, and October
- How commonOccasional
Photo credit: (c) ttsquid, some rights reserved (CC BY) · CC BY · iNaturalist
About this species
Diloma concameratum, common name the speckled periwinkle, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Text from the Wikipedia article “Diloma concameratum”, 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: 203 records
- February: 95 records
- March: 165 records
- April: 170 records
- May: 127 records
- June: 83 records
- July: 88 records
- August: 108 records
- September: 124 records
- October: 182 records
- November: 136 records
- December: 158 records
Depth and water temperature
Depth
Mostly recorded at 0 m · Deepest record: 0.5 m
Water temperature
Recorded in surface water of 14–24 °C
Photos
(c) Tim, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist 
(c) Thomas Mesaglio, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) ttsquid, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Rod Lowther, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) unmotivated_frog, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Bronte-Maye, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Peter Crowcroft, some rights reserved (CC BY) · CC BY · iNaturalist
Names and classification
- English
- Speckled Periwinkle, Wavy Periwinkle, Wavy Top
Names in 1 more languages
- Japanese
- イシガキシタダミ
Other scientific names: Austrocochlea concamerata, Trochus concameratus, Trochus striolatus, Trochus viridis
Similar species
Scorched monodontDiloma aethiops
Mudflat Top ShellDiloma subrostratum
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).
- 1,165 open-data records from 1908 to 2017.
- Species data updated November 2, 2026.
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