Capitellid thread worm

Heteromastus filiformis

Other invertebrates
IUCN: Not evaluated

Usual depth0–362 m
Water temperature-1–27 °C
Best monthsApril, May, and September
How commonCommon

All species

Where and when

Where it has been recorded

Worldwide

Loading the map

Best months

Worldwide (open data)

January: 363 records
February: 288 records
March: 1,443 records
April: 3,544 records
May: 4,699 records
June: 1,430 records
July: 639 records
August: 1,500 records
September: 3,385 records
October: 2,191 records
November: 1,177 records
December: 424 records

Depth and water temperature

Depth

Mostly recorded at 0–362 m · Deepest record: 3,180 m

0–10 m: 6,777 records
10–20 m: 2,635 records
20–30 m: 450 records
30–40 m: 76 records
40–50 m: 58 records
50–60 m: 60 records
60–70 m: 56 records
70–80 m: 68 records
80–90 m: 62 records
90–100 m: 57 records
100–110 m: 139 records
110+ m: 4,942 records

Water temperature

Recorded in surface water of -1–27 °C

-2–0 °C: 2 records
0–2 °C: 0 records
2–4 °C: 0 records
4–6 °C: 12 records
6–8 °C: 44 records
8–10 °C: 85 records
10–12 °C: 491 records
12–14 °C: 178 records
14–16 °C: 14 records
16–18 °C: 6 records
18–20 °C: 0 records
20–22 °C: 6 records
22–24 °C: 2 records
24–26 °C: 0 records
26–28 °C: 1 records

Names and classification

English: Capitellid thread worm, Capitellid threadworm, Red thread worm, capitellid thread worm, capitellid threadworm, Capitellid Threadworm, Capitellid Thread Worm, Capitellid Worm, red thread worm, Red Thread Worm

Names in 2 more languages

German: Kotpillenwurm, Roter Gummiband-Wurm
Korean: 고리버들갯지렁이

Other scientific names: Ancistria capillaris, Ancistria minima, Areniella filiformis, Capitella costana, Capitella filiformis, Capitella fimbriata, Notomastus filiformis, Notomastus laevis

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).
90,038 open-data records from 1863 to 2024.
Species data updated October 30, 2026.

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