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The cosmological numerical simulations tell us that accretion of externalmetal-poor gas drives star-formation (SF) in galaxy disks. One the best piecesof observational evidence supporting this prediction is the existence of lowmetallicity star-forming regions in relatively high metallicity host galaxies.The SF is thought to be fed by metal-poor gas recently accreted. Since the gasaccretion is stochastic, there should be galaxies with all the properties of ahost but without the low metallicity starburst. These galaxies have not beenidentified yet. The exception may be UGC 2162, a nearby ultra-diffuse galaxy(UDG) which combines low surface brightness and relatively high metallicity. Weconfirm the high metallicity of UGC 2162 (12 + log(O/H) = 8.52+0.27-0.24 )using spectra taken with the 10-m GTC telescope. GC2162 has the stellar mass,metallicity, and star-formation rate (SFR) surface density expected for a hostgalaxy in between outbursts. This fact suggests a physical connection betweensome UDGs and metal-poor galaxies, which may be the same type of object in adifferent phase of the SF cycle. UGC 2162 is a high-metallicity outlier of themass-metallicity relation, a property shared by the few UDGs with knowngas-phase metallicity.

A headless tadpole galaxy: the high gas-phase metallicity of the ultra-diffuse galaxy UGC 2162