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Very recently, the LHCb collaboration has reported the new result about thehidden-charm pentaquarks: $P_c(4312)$ near the $\bar{D}\Sigma_c$ threshold, and$P_c(4440)$ and $P_c(4457)$ near $\bar{D}^*\Sigma_c$ threshold. We study theheavy quark spin (HQS) multiplet structures of these newly $P_c$ pentaquarksunder the heavy quark spin symmetry based on the hadronic molecular picture. Wepoint out that $P_c(4312)$ is the $J^P = 1/2^-$ member of an HQS triplet, and$P_c(4440)$ and $P_c(4457)$ are the $J^P = 3/2^-$ member of the HQS triplet andan HQS singlet with $J^P = 3/2^-$. Namely, the $P_c(4312)$ and one of$P_c(4440)$ and $P_c(4457)$ belong to an HQS triplet. The HQS multipletstructure predicts the existence of $J^P = 5/2^-$ state near$\bar{D}^\ast\Sigma_c^\ast$ threshold.

Heavy quark spin multiplet structure of $P_c(4312)$, $P_c(4440)$, and $P_c(4457)$