Can anyone help me identify this crab species? Found in rock pools of Dee Why, Sydney, Australia. That's not a bucket either, but a disposable cup, so it may well be a juvenile. Carapace about an inch diameter.
It's a species of Thalamita, I'm not sure on the species -how many lobes does it have between the eyes? Try to use the keys in the below papers and see where you get:
Stephenson, W., & Hudson, J. J. (1957). The Australian portunids (Crustacea: Portunidae). I. The genus Thalamita. Marine and Freshwater Research, 8(3), 312-368
DPC, W. NG PKL 1995.—Swimming crabs of the genera Charybdis de Haan, 1883, and Thalamita Latreille, 1829 (Crustacea: Decapoda: Brachyura: Portunidae) from Peninsular Malaysia and Singapore. The Raffles Bulletin of Zoology (Supplement), 1, 1-128.
There's been a recent revision and Thalamita has been rearranged so check this too:
Evans, N. (2018). Molecular phylogenetics of swimming crabs (Portunoidea Rafinesque, 1815) supports a revised family-level classification and suggests a single derived origin of symbiotic taxa. PeerJ, 6, e4260
Cheers
https://www.researchgate.net/post/How_can_I_get_Excel_data_of_any_published_paper_on_crabs_carapace_size-weight_relationship
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