We derive an age of 11$\pm$2 Myr for Musca, based on lithium, rotation, and the color-magnitude diagram of Musca members. TOI 1227's kinematics and strong lithium absorption confirm it is a member of a previously discovered sub-group in the Lower Centaurus Crux OB association, which we designate the Musca group.
We report the discovery and validation of TOI 1227 b, a $0.85\pm0.05 R_J$ (9.5$R_\oplus$) planet transiting a very low-mass star ($0.170\pm0.015 M_\odot$) every 27.4 days. Thus, we expect to find 5-15$R_\oplus$ planets around young stars even if their older counterparts harbor none. Mature super-Earths and sub-Neptunes are predicted to be $\simeq$Jovian radius when younger than 10 Myr.
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