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Photo#147222
Monarch pupa - female - Danaus plexippus - female

Monarch pupa - female - Danaus plexippus - Female
Parry Sound Ontario Canada, Ontario, Canada

Sexing Monarch pupae
The pupa is attached to the substrate by the cremaster(black rod which fifth instar larva thrusts into silk button as the skin is shed and pupa is formed). Under the cremaster are a number of rings, the abdominal sternites. Within the first ring (9th abdominal sternite) are several paired black dots. If the pupa is a female (as this one is), the ring below the lowest pair of black dots has a line centered between the dots. Male pupae lack this line.

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