A mesonephric tubule is an epithelial tube that is part of the mesonephros[GO]. Genital ridge that is next to the mesonephros[WP].

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Any of the renal tubules composing the mesonephros. In mammals they function as excretory structures during the early embryonic development but are later incorporated into the reproductive system. [TFD][VHOG]

uberon

tubuli mesonephrici, renal tubules

As the pronephros regresses, the archinephric duct induces the sequential differentiation of tubules in the more caudal parts of the nephric ridge. (...) Tubules that differentiate in the middle part of the nephric ridge form a kidney called the mesonephros. This kidney functions in the embryos and larvae of all vertebrates.[well established][VHOG]

UBERON:0000083

http://purl.obolibrary.org/obo/uberon.owl, http://purl.obolibrary.org/obo/cl.owl