From ZooTerms (Dictionary of Invertebrate Zoology)
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spermatheca (noun; plural -ae; Greek sperma, seed; theke, case): A saccate genital structure in female invertebrates in which sperm from the male is received and may or may not be stored; seminal receptacle; copulatory sac; copulatory pouch; seminal bursa; seminal receptical

See also: ectospermalege.