sky blue coral

Acropora nana

Corals and anemones
IUCN: Endangered

Usual depth0–26 m
Water temperature22–30 °C
Best monthsMay, August, and October
How commonRare

All species

Photo credit: (c) Kerryn Johns, some rights reserved (CC BY) · CC BY · iNaturalist

Where and when

Where it has been recorded

Worldwide

Loading the map

Best months

Worldwide (open data)

January: 1 records
February: 1 records
March: 2 records
April: 4 records
May: 19 records
June: 2 records
July: 1 records
August: 19 records
September: 3 records
October: 14 records
November: 5 records
December: 3 records

Depth and water temperature

Depth

Mostly recorded at 0–26 m · Deepest record: 85 m

0–10 m: 17 records
10–20 m: 9 records
20–30 m: 2 records
30–40 m: 0 records
40–50 m: 0 records
50–60 m: 0 records
60–70 m: 0 records
70–80 m: 0 records
80–90 m: 2 records

Water temperature

Recorded in surface water of 22–30 °C

20–22 °C: 3 records
22–24 °C: 9 records
24–26 °C: 26 records
26–28 °C: 96 records
28–30 °C: 129 records

Photos

Names and classification

English: sky blue coral

Names in 2 more languages

German: Himmelblaue Geweihkoralle
Japanese: スゲミドリイシ

Other scientific names: Acropora (Acropora) azurea, Acropora (Acropora) nana, Acropora azurea, Madrepora (Polystachys) nana, Madrepora nana

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.
Conservation status as published by GBIF (IUCN Red List).
309 open-data records from 1878 to 2011.
Species data updated October 26, 2026.

Log what you see on your next dive

The free DiveHive diver app keeps your logbook with every sighting and shows what lives at the site you dive next.

Join the waitlist