The humped tree snail (Partula gibba; akaleha, denden), in the Partulidae family, is endemic to the forest ecosystem on the Mariana Islands of Guam, Rota, Saipan, Tinian, Aguiguan, Anatahan, Sarigan, Alamagan, and Pagan. The shell of the humped tree snail can be left- or right-coiling, conic-ovate...