Baldhead halosaur

Aldrovandia phalacra

Fish
IUCN: Least concern

Usual depth912–1,646 m
Water temperature6–29 °C
Best monthsAugust, October, and November
How commonOccasional

About this species

Aldrovandia phalacra, the Hawaiian halosaurid, is a species of ray-finned fish in the family Halosauridae. It is a circumglobal species found at bathyal depths.

Text from the Wikipedia article “Aldrovandia phalacra”, 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: 5 records
February: 6 records
March: 27 records
April: 4 records
May: 19 records
June: 10 records
July: 13 records
August: 96 records
September: 50 records
October: 71 records
November: 63 records
December: 17 records

Depth and water temperature

Depth

Mostly recorded at 912–1,646 m · Deepest record: 2,652 m

40–50 m: 1 records
50–60 m: 0 records
60–70 m: 0 records
70–80 m: 0 records
80–90 m: 0 records
90–100 m: 0 records
100–110 m: 0 records
110–120 m: 0 records
120–130 m: 0 records
130–140 m: 0 records
140–150 m: 0 records
150+ m: 299 records

Water temperature

Recorded in surface water of 6–29 °C

4–6 °C: 1 records
6–8 °C: 0 records
8–10 °C: 1 records
10–12 °C: 85 records
12–14 °C: 11 records
14–16 °C: 2 records
16–18 °C: 20 records
18–20 °C: 20 records
20–22 °C: 16 records
22–24 °C: 10 records
24–26 °C: 177 records
26–28 °C: 51 records
28–30 °C: 18 records

Names and classification

English: Baldhead halosaur, Hawaiian halosaurid, Halosaur, Hawaiian halosaur, Hawaiian Halosaurid Fish, Kauai Halosaurid Fish

Names in 1 more languages

Simplified Chinese: 裸頭海蜴魚

Other scientific names: Aldrovandia kauaiensis, Halosaurichthys nigerrimus, Halosauropsis kauaiensis, Halosauropsis verticalis, Halosaurus phalacrus

Similar species

Gilbert's halosaurid
Aldrovandia affinis
Challenger halosaur
Aldrovandia mediorostris
rostrate halosaur
Aldrovandia rostrata
Halosaurus ridgwayi

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).
654 open-data records from 1883 to 2021.

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