I am not an expert. I have photos of Den. aphyllum(=Den.pierardii) and Den. primulinum. Let's see the difference of their lip...
Den.appyllum, no lines on its lip.(with lines on the throat)
Den. primulinum, lines on both lip and throat.
No Den.appyllum have such lines on its lip.(The petal of appyllum is much wider too)
So I think yours is Den. primulinum.






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