animal organ morphogenesis spermathecum morphogenesis biological_process See also the fly_anatomy.ontology term 'spermathecum ; FBbt:00004921'. The process in which the anatomical structures of a spermathecum, a sperm storage organ, are generated and organized. Paired spermathecae lie at the anterior end of the insect uterus on the dorsal side. Each spermatheca consists of an oval shaped capsule, connected to the uterus by a spermathecal stalk. GO:0035211