spontaneously ruptured uterine angioleiomyoma angioleiomyoma is an uncommon type of leiomyoma of the uterus that originates from smooth muscle cells and contains thickwalled vessels a 45yearold woman with the complaint of lower abdominal pain was admitted to the hospital in the operation a ruptured bleeding uterine tumor was seen she underwent total hysterectomy and bilateral salpingooophorectomy on pathologic examination of the specimen the tumor was diagnosed as angioleiomyoma here an unusual clinical presentation of uterine angioleiomyoma was reported biomechanics deadly strike mechanism of a mantis shrimp stomatopods mantis shrimp are well known for the feeding appendages they use to smash shells and impale fish here we show that the peacock mantis shrimp odontodactylus scyllarus generates an extremely fast strike that requires major energy storage and release which we explain in terms of a saddleshaped exoskeletal spring mechanism highspeed images reveal the formation and collapse of vapour bubbles next to the prey due to swift movement of the appendage towards it indicating that o scyllarus may use destructive cavitation forces to damage its prey