This species can be easily missed due to the size and they are good at hiding amongst the seagrasses and algae they live in. The common name leads you to believe they are a spider crab but in fact they are not even closely related.
The colouration of this species varies from reddish browns to greens and even black and whites the key to identifying this species is in the shape of the subcircular carapace being flat across the top and the rostrum (between the eyes) featuring three prongs the middle one being slightly longer than the other two. The four legs are thin and may be mottled in colour or even a different colour to the carapace.
This species is a prominent food source for bottom feeding fishes.
How to identify Halicarcinus ovatus?
What habitats does Halicarcinus ovatus live in?
Can be found on reefs, seagrass and algae areas along the shoreline out to a depth of around 85m
What is the distribution of Halicarcinus ovatus?
Southern Australia including around Tasmania
How big does Halicarcinus ovatus grow?
Can grow to around 10mm 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.