The sand goby has two dorsal fins with a wider gap between them than the common goby (Pomatoschistus microps), the anterior one consisting of six soft spines and the posterior one eight to eleven soft rays. The pelvic fins are fused with the anal fins. There are 58 to 72 scales along the lateral line and these scales are rather smaller than those of the common goby.

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Jawfishes (Opistognathidae) typically reside in burrows they construct in sandy substrate. They will stuff their mouths with sand and spit it out elsewhere, slowly creating a tunnel. Using the protection of these burrows, these fish will hover, feeding on plankton or other small organisms, ready to dart back in at the first sign of danger. They are territorial of the area around their burrow

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