Glycera tridactyla

Other invertebrates

Usual depth0–32 m
Water temperature10–29 °C
Best monthsMarch, April, and June
How commonCommon

Photo credit: (c) Duarte Frade, some rights reserved (CC BY) · CC BY · iNaturalist

About this species

The genus Glycera is a group of polychaetes commonly known as bloodworms. They are typically found on the bottom of shallow marine waters, and some species can grow up to 35 cm (14 in) in length.

Text from the Wikipedia article “Glycera (annelid)”, 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: 311 records
February: 517 records
March: 1,093 records
April: 1,177 records
May: 932 records
June: 1,522 records
July: 771 records
August: 615 records
September: 1,063 records
October: 565 records
November: 229 records
December: 112 records

Depth and water temperature

Depth

Mostly recorded at 0–32 m · Deepest record: 500 m

0–10 m: 2,950 records
10–20 m: 888 records
20–30 m: 273 records
30–40 m: 126 records
40–50 m: 104 records
50–60 m: 42 records
60–70 m: 13 records
70–80 m: 17 records
80–90 m: 75 records
90–100 m: 26 records
100–110 m: 44 records
110+ m: 72 records

Water temperature

Recorded in surface water of 10–29 °C

8–10 °C: 2 records
10–12 °C: 304 records
12–14 °C: 454 records
14–16 °C: 16 records
16–18 °C: 24 records
18–20 °C: 20 records
20–22 °C: 12 records
22–24 °C: 0 records
24–26 °C: 0 records
26–28 °C: 4 records
28–30 °C: 1 records

Names and classification

Other scientific names: Glycera convoluta, Glycera retractilis, Rhynchobolus convolutus

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.
Descriptions: Wikipedia, licensed CC BY-SA, each linked to its article.
10,178 open-data records from 1861 to 2024.

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