Found along Tomahawk Beach under rocks at low tide this crab is less common now days due to invasive crabs such as New Zealand Half Crab (Petrolisthes elongatus)
Similar Species include Paragrapsus laevis, Paragrapsus gaimardii, Leptograpsodes octodentatus
Like all the other shore crabs they feed on the decaying fish and seaweeds found along our beaches and scurry away to find shelter when disturbed.
How to identify Brachynotus spinosus?
Often confused with the juveniles of other crabs in this family, this small crab has a mottled brown green to grey body and features three small notches behind the eye on the side of the carapace The first of the notches is slightly more forward (closer to the eye) than the last two set on a slight angle the front of the carapace is angled downwards with eyes that are black with white spots at the corner of the carapace. The walking legs with a single spine on the distal end of the merus, chelipeds with a mat of hairs on the inner and outer surfaces.
What habitats does Brachynotus spinosus live in?
Can be found under rocks in the inter-tidal zone out to a depth of 10m
What is the distribution of Brachynotus spinosus?
South-eastern Australia including around Tasmania
How big does Brachynotus spinosus grow?
Can grow to around 20mm across the carapace
Disclaimer: A lot of work goes into trying to identify and ensure accurate identifications are made and that the listed Descriptions, Sizes, Habitats and Distribution information is as accurate and valid as possible. Unfortunately, information in this arena is ever changing and as such no guarantee can be offered that it is correct or currently valid as a result the information is provided as a guide, and it is always suggested that you do a little research to ensure you have the latest and most accurate information. View the reference's or bibliography I welcome any feedback and comments on the information provided.