Slender bristlemouth

Cyclothone pseudopallida

Fish
IUCN: Least concern

Usual depth250–1,000 m
Water temperature2–29 °C
Best monthsApril
How commonOccasional

About this species

Cyclothone pseudopallida, commonly known as the slender bristlemouth, is a species of ray-finned fish in the genus Cyclothone.

Text from the Wikipedia article “Cyclothone pseudopallida”, 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: 17 records
February: 15 records
March: 38 records
April: 141 records
May: 38 records
June: 43 records
July: 43 records
August: 15 records
September: 53 records
October: 77 records
November: 75 records
December: 22 records

Depth and water temperature

Depth

Mostly recorded at 250–1,000 m · Deepest record: 7,356.5 m

10–20 m: 1 records
20–30 m: 0 records
30–40 m: 1 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
90–100 m: 0 records
100–110 m: 1 records
110–120 m: 0 records
120+ m: 399 records

Water temperature

Recorded in surface water of 2–29 °C

0–2 °C: 2 records
2–4 °C: 0 records
4–6 °C: 3 records
6–8 °C: 1 records
8–10 °C: 5 records
10–12 °C: 13 records
12–14 °C: 23 records
14–16 °C: 59 records
16–18 °C: 42 records
18–20 °C: 9 records
20–22 °C: 25 records
22–24 °C: 29 records
24–26 °C: 26 records
26–28 °C: 40 records
28–30 °C: 24 records

Names and classification

English: Slender bristlemouth, Bristlemouth, Phantom Bristlemouth, slender bristlemouth

Names in 3 more languages

Spanish: luciérnaga palida
French: Cyclothone à crâne ponctué, cyclothone mince
Japanese: Haiironihadaka, ハイイロオニハダカ

Similar species

Showy bristlemouth
Cyclothone signata
Benttooth bristlemouth
Cyclothone acclinidens
Albino anglemouth
Cyclothone alba
Deep-water bristlemouth
Cyclothone atraria
Spottail anglemouth
Cyclothone braueri
Veiled anglemouth
Cyclothone microdon

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).
1,504 open-data records from 1959 to 2023.
Species data updated November 1, 2026.

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