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The BBC's legal team argue the two presenters were not doing similar work.
Journalists' union the NUJ described the BBC's gender pay gap as "monumental".
Ahmed has presented Newswatch since 2012. According to the NUJ, although her wages were increased in 2015 to £465 Per programme, they were reduced again when The Corporation moved presenters onto employment contracts.Samira Ahmed (r) and fellow BBC presenter Naga Munchetty arrive at The Employment tribunal at Victory House, London on Monday Morning
"I know that it is an important part of demonstrating the BBC service to all its audiences and the licence fee payers.
"I have a sense of pride working for a public service broadcaster which seeks to represent the diversity of Britain and its licence fee payers. "
She added: "On the back of my BBC ID card are written the BBC values which include 'we respect each other and celebrate our diversity' and 'we take pride in delivering quality and value for money'.
In response to her claims, the BBC insisted it "is committed to equal pay", explaining the pay difference occurred due to the fact Vine's show is "entertainment" and Ahmed's programme was "news".
"Samira was Paid the same as her male predecessor when she began presenting Newswatch . Gender has not been a factor in levels of pay for Points of View. News and entertainment are very different markets and pay across the media industry reflects this. "
"Unfortunately, despite Samira going through a lengthy and frustrating internal process in The Hope that a sensible solution could be achieved, the BBC has not resolved this case and it will now be for the tribunal to determine whether this monumental pay gap is appropriate and defensible," said NUJ General Secretary Michelle Stanistreet .
"Samira is to be congratulated for her persistence and determination to secure fair and equal treatment by her employer. "
Other broadcasting colleagues including Naga Munchetty , Sandi Toksvig , Alan Rusbridger , Andrew Copson , Baroness Sayeeda Warsi and The Right Reverend Nicholas Baines have offered Ahmed their support.
The case opened on Monday at the Central London Employment Tribunal with witnesses expected to appear on Tuesday.
It is listed to last for Seven Days .
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