Riffle lists within lists? [closed]

I have two lists that I want to riffle together, but they are lists within lists.

means={{314.027, 311.279, 278.39, 287.405, 276.379, 265.199, 269.911},{317.122, 331.514, 285.738, 291.407, 287.865, 276.812, 294.436}};
dev={{37.5608, 46.5827, 19.7565, 28.9158, 23.8619, 22.0467, 18.8418}, {36.9014, 47.4611, 26.3038, 22.0878, 39.6042, 39.2833, 29.1026}};


So essentially I want to riffle the first list in the first list with the first list in the second list. This is just an example (there is a lot more to the list!) so it can't depend on the number of lists within lists or number of values in each list (as this can vary) but the first list of each list will match up by riffle.

closed as off-topic by Mr.Wizard♦Mar 4 '17 at 22:46

This question appears to be off-topic. The users who voted to close gave this specific reason:

• "This question arises due to a simple mistake such as a trivial syntax error, incorrect capitalization, spelling mistake, or other typographical error and is unlikely to help any future visitors, or else it is easily found in the documentation." – Mr.Wizard
If this question can be reworded to fit the rules in the help center, please edit the question.

• Riffle @@@ Transpose[{means, dev}] – corey979 Mar 4 '17 at 22:29
• ... or MapThread[Riffle, {means, dev}]? – kglr Mar 4 '17 at 22:35