Sacs for storage of spermatophores or sperm, usually on sternite of thoracic somite 7 (sometimes spermathecae), associated with thelycum in Dendrobranchiata [Poore, 2004].
Unpaired or paired bulbous or tubular sacs associated with the thelycum for the storage of spermatophores or sperm, situated immediately dorsal to plate(s) of sternite XIV, sometimes XIII and/or XII [Perez Farfante and Kensley, 1997].
Crustacea glossary. Natural History Museum of Los Angeles County. 2011.