Leeds then scored a second try when Meli - a player the Rhinos targeted throughout - failed to flick a McGuire grubber kick into touch.
The visitors began bravely before Leon Pryce and Willie Talau combined to put Meli over in the left-hand corner, and six minutes later former Everton trainee Matty Smith collected a Jason Cayless pass to put Wilkin over for his opening score.
Wellens, 30, and Meli, 31, have signed two-year deals, while Queenslander Flannery, 30, has extended his stay on Merseyside for another season.
Long's long pass wide exploited Amos Roberts stepping out of the Wigan defensive line and found winger Meli to ground the ball in the left-hand corner.
St Helens travel to Wakefield on Sunday sitting third in Super League, six points behind leaders and local rivals Wigan, and Meli wants his side to build on their 32-18 victory over Harlequins last week.
And they then pressed the Castleford line, Meli used a clever dummy and drive from acting half-back to drive over.
Scruton's sending-off proved a key turning point and Saints immediately made the extra man count with Wellens and Talau getting Meli over for his second try to make it 18-6.
But coach Mick Potter sprang a slight surprise by switching Sia Soliola to the pack, freeing him to recall fit-again Jonny Lomax on the wing and slip Meli inside to centre.
When Saints managed to put the visitors under pressure their defence was up to the test, Dorn pulling off a last-ditch tackle on Gaskell and Calderwood tackling Francis Meli into touch at the corner.
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Matt Gidley had given Saints the lead after 10 minutes but Wigan went ahead on half-time when Sam Tomkins took advantage of a mistake by Francis Meli.
James Roby set up Meli to power over once more to extend their lead and just on half-time, the Dragons conceded another score when Wheeler took advantage of some slack defending for his second try.
Matt Gidley regained the lead for Saints, who added five second-half scores when James Roby touched down twice, along with Francis Meli.
Saints twice led with tries from Paul Wellens and Francis Meli only for the Dragons to hit back with a devastating burst to lead 24-10 at the break.
However, a precise cross-field kick from Burrow after 20 minutes almost resulted in a score for Leeds, Francis Meli managing to thwart the danger by gathering the ball at the second attempt.
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