Medium Square Square Square Square
Photo © harvestman, all rights reserved
47.5401042388, -122.3975667953 (Google, OSM) Details Hide details
Logo eee 15px

Comments & Identifications

Thumb
Purple Shore Crab - Photo (c) Dan Hershman, some rights reserved (CC BY)
chriswbrown's ID: Purple Shore Crab (Hemigrapsus nudus)
Posted by chriswbrown over 4 years ago (Flag)
Thumb
Hemigrapsus - Photo (c) Lynette Schimming, some rights reserved (CC BY-NC-SA)
harvestman's ID: Genus Hemigrapsus, a member of True Crabs (Infraorder Brachyura)
Posted by harvestman over 4 years ago (Flag)
Thumb

Lots of Shore Crabs here around the Puget Sound beaches. Rock flipping never gets old.

Posted by harvestman over 4 years ago (Flag)
Thumb
Purple Shore Crab - Photo (c) Dan Hershman, some rights reserved (CC BY)
greenrosettas's ID: Purple Shore Crab (Hemigrapsus nudus)
Posted by greenrosettas over 4 years ago (Flag)
Thumb

Wow, look at the red one. I've never seen that coloration before, cool observation. Also in one of the pictures there is a Yellow Shore Crab (Mud-flat Crab, Hairy Shore Crab, Oregon Shore Crab) - Hemigrapsus oregonensis.

Posted by greenrosettas over 4 years ago (Flag)
Thumb

All except the last photo are H. nudus exhibiting their common color morphs. The last picture is H. oregonensis with some interesting carapace color. Note the hairy legs, which is the easiest way to distinguish from H. nudus. If it were me, I'd put it in a separate observation so there are records of both of them.

Posted by chriswbrown over 4 years ago (Flag)
Thumb

Im not sure I understand your comment invertboy. I dont see hairy legs on any of them and the pics I'm finding of H. oregonensis are mostly greenish like the one in the second photo, not white like the last.

Posted by harvestman over 4 years ago (Flag)
Thumb

I agree with invertboy's assessment. The hair is probably hard to see in the photo, but you can also tell by the shape of the marginal teeth. They are forward-pointing in H. oregonensis, but rounded/swooped toward center in H. nudus. Also the 2 rostral bumps are more pronounced on H. oregonensis, which can have an astounding variety of color patterns: https://invertzoology.wordpress.com/2013/07/17/color-variation-in-hemigrapsus-oregonensis-arthropoda-pancrustacea-malacostraca-brachyura/

Posted by ittibittium 4 months ago (Flag)
Sign in or Sign up to add comments
Sign in or Sign up to add identifications
Hemigrapsus - Photo (c) Lynette Schimming, some rights reserved (CC BY-NC-SA)
harvestman's ID: Genus Hemigrapsus, a member of True Crabs (Infraorder Brachyura)
Hemigrapsus - Photo (c) Lynette Schimming, some rights reserved (CC BY-NC-SA)
Community ID: Genus Hemigrapsus, a member of True Crabs (Infraorder Brachyura)
About
Purple Shore Crab - Photo (c) Dan Hershman, some rights reserved (CC BY)
chriswbrown's ID: Purple Shore Crab (Hemigrapsus nudus)
greenrosettas 1 person agrees
Logo eee 15px
Logo eee 15px

Data Quality Assessment

Needs ID
Details Hide details
Logo eee 15px
Observation © Joel
Cc by small some rights reserved
Pin it button
Member of the iNaturalist Network   |   Powered by iNaturalist open source software