Striped shore crab

About this species

Pachygrapsus crassipes, the striped shore crab or lined shore crab, is a small crab found on both rocky and hard-mud soft seashores of the northeastern and northwestern Pacific Ocean. In North America, this species occurs from central Oregon, south through California to near Ensenada, Baja California, Mexico. There is an isolated population with a wide range disjunction at Bamfield on Vancouver Island, Canada. The western Pacific population, including both Korea and Japan is isolated with a divergence time from the eastern Pacific population estimated between 0.8 and 1.2 Mya.

Text from the Wikipedia article “Pachygrapsus crassipes”, 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: 1,483 records
February: 1,489 records
March: 2,568 records
April: 3,282 records
May: 4,473 records
June: 6,858 records
July: 5,229 records
August: 3,174 records
September: 2,264 records
October: 2,001 records
November: 1,430 records
December: 1,176 records

Depth and water temperature

Depth

Mostly recorded at 0–0 m · Deepest record: 214.9 m

0–10 m: 515 records
10–20 m: 2 records
20–30 m: 1 records
30–40 m: 0 records
40–50 m: 0 records
50–60 m: 0 records
60–70 m: 1 records
70–80 m: 0 records
80–90 m: 0 records
90–100 m: 0 records
100–110 m: 0 records
110+ m: 1 records

Water temperature

Recorded in surface water of 11–22 °C

10–12 °C: 9 records
12–14 °C: 7 records
14–16 °C: 13 records
16–18 °C: 12 records
18–20 °C: 3 records
20–22 °C: 0 records
22–24 °C: 3 records

Photos

(c) Jerry Kirkhart, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Peter D. Tillman, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist
(c) Jerry Kirkhart, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Linzy L., some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist
(c) Megan, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Tom Fazekas, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Calamites297, some rights reserved (CC BY) · CC BY · iNaturalist

Names and classification

English: Striped shore crab, Lined Shore Crab, striped shore crab

Names in 5 more languages

German: Gestreifte Felsenkrabbe
Spanish: Cangrejo costero rayado
Japanese: イワガニ, 岩蟹
Korean: 바위게
Simplified Chinese: 粗腿厚紋蟹

Other scientific names: Grapsus eydouxi, Leptograpsus gonagrus

Similar species

Pachygrapsus laevimanus
Tiny Rock Crab
Pachygrapsus minutus
Hairy-fingered Rock Crab
Pachygrapsus planifrons
Pleated rock crab
Pachygrapsus plicatus
Polynesian grapsid crab
Pachygrapsus fakaravensis
Cliff crab
Grapsus grapsus

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).
4,417 open-data records from 1922 to 2024.
Species data updated November 5, 2026.