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Thalassinoides is an ichnogenus of trace fossil (fossil records of ' movement, rather than of the lifeforms themselves) used to refer to "dichotomously or T-branched boxworks, mazes and shafts, unlined and unornamented".
Facies of Thalassinoides increased suddenly in abundance at the beginning of the Mesozoic. Such burrows are made by a number of organisms, including the sea anemone Cerianthus, Balanoglossus and , but are most closely associated with Decapoda of the (former) infraorder Thalassinidea.==Gallery==
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