Diaphera prima is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Diapheridae.

[1] The specific name prima (Latin for first) indicates that it is the first species of Diaphera confirmed in Thailand.

[1] The type locality of Diaphera prima is Khao Cha Ang-Oan, Bor Thong, Chonburi Province, Thailand.

[1] The sculpture of the shell is smooth with short ribs below the suture.

[1] The body of the animal is a pale greenish yellow in color.