Diversity test on two samples

Hi all !
I wanted to do a diversity test between the day period and the night to show if there is more species in day than in night or vice versa or just no significance difference. I don't care about the value, I speak about the species diversity.
Are there more different species during the day than at night from a statistical point of view ?

df <- data.frame (value  = c(96.14,94.62,92.41,91.27,84.14,74.91,82.14),
                  Species= c("Axo", "Pite", "Yier","Molu","Hute","Chyt","Chut"),
                  Period= c("day","day","night","day","day","night","day")

Thanks !