1. Named after Atmo... I made the mistake in naming his son, Iwan!
2. Third smallest flower of Paphiopedilum ...Paph. barbigerum, Paph. coccineum, Paph. exul and others are larger flowers than this species. I believe the smallest flower in Paph. species is Paph. thaianum (flowers as small as 2.5cm across), second is maybe Paph. helenae (flowers about 3cm across)... you named the pictured species in your list though, Julie...
As for #3, you forgot another bifoliate Brazilian species... this one looks similar to Cattleya acklandiae...
Here's what has been named:
1. Paphiopedilum kolopakingii - Julie
3. Paphiopedilum chamberlainianum var. latifolium - Elena