The nymphs are possibly inspired from Dante manuscripts

[MarcoP]

In the interest of clarity- or whatever, in the fourth illustration designated as "A bunch of nude women with stars..." there is reason to consider the gender of the characters depicted. The absence of obvious genitalia does not imply that the characters are female. Many medieval artists chose to avoid anatomical accuracy, completely. 

The absence of breasts implies that the characters are not female. Naked ladies have breasts quite frequently. The presence of weapons also implies they are male. Hair, beyond shoulder length, is ambiguous.

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Indeed Valencia 837 is a MS of Virgil's Aeneid (not Dante). This is from book 6, when Aeneas visits the underworld. These are the souls of Aeneas' descendants, Alban and Roman warriors, who will be born after his death.