Definitions

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Vas deferens

Duct in male passage of sperm from testis to penis. [McLaughlin, 1980]
Ducts in males for passage of spermatozoa from testis to penis. [Moore and McCormick, 1969]
Male duct from the testis to the penile papilla for the passage of sperm. [Wilson, 1989]
(Taxon-specific: Order Cladocera) Section of male reproductive system extending from posterior end of each testis to gonopore(s) or penis(es) on postabdomen.
(syn. sperm duct) [Stachowitsch, 1992]
(Taxon-specific: Order Notostraca) Gonad. [Stachowitsch, 1992]
(Taxon-specific: Order Diplostraca) Gonad. [Stachowitsch, 1992]
(Taxon-specific: Order Anostraca) Short, slender section of male reproductive system between each testis and penis; expanded at base of penis to form seminal vesicle. [Stachowitsch, 1992]
(Taxon-specific: Class Cephalocarida) Section of male reproductive system between each tesis and gonopore. Terminal section merges with oviduct to form common duct (gonoduct) opening on sixth thoracic segment (thoracomere). [Stachowitsch, 1992]
(Taxon-specific: Order Cumacea) Section of male reproductive system between each testis and gonopores on ventral surface of last (fifth) pereon segment.
(syn. sperm duct) [Stachowitsch, 1992]
(Taxon-specific: Order Decapoda) Narrow section of d reproductive system extending from each dorsal testis to gonopore on basal segment (coxa) of last thoracopod. May be modified into various regions for spermatophore production; forms terminal ejaculatory duct.
(syn. sperm duct) [Stachowitsch, 1992]
(Taxon-specific: Order Amphipoda) Section of male reproductive system between each testis and each penis. Characterized by glandular walls and terminal modifications.
(syn. sperm duct) [Stachowitsch, 1992]
(Taxon-specific: Order Isopoda) Section of male reproductive system between each testis and male gonopore(s).
(syn. sperm duct) [Stachowitsch, 1992]
(Taxon-specific: Order Mysida) Paired, slender, and elongate section of male reproductive system between seminal vesicle and ejaculatory ducts. [Stachowitsch, 1992]
(Taxon-specific: Order Stomatopoda) Section of male reproductive system between each testis and each penis; elongate and slender, each extending from third abdominal somite (pleomere) anteriorly to penis on eighth thoracic appendage (thoracopod).
(syn. sperm duct) [Stachowitsch, 1992]
(Taxon-specific: Order Leptostraca) Relatively short, ventral section of male reproductive system between each testis and gonopore.
(syn. sperm duct) [Stachowitsch, 1992]
(Taxon-specific: Subclass Branchiura) In male reproductive system, pair of narrow sperm ducts leading from median seminal vesicle; each vas deferens connects to duct of blind capsule and leads to common ejaculatory duct. [Stachowitsch, 1992]
(Taxon-specific: Subclass Cirripedia) In male reproductive system, duct extending from each testis; ducts merge at base of penis (to form ductus ejaculatorius).
(syn. sperm duct) [Stachowitsch, 1992]
(Taxon-specific: Subclass Mystacocarida) Unpaired, anteriorly directed section of male reproductive system between testis and gonopore. Produces spermatophores. [Stachowitsch, 1992]
(Taxon-specific: Class Ostracoda) Section of male reproductive system leading form testis to gonopore on first abdominal segment (genital somite). Originates at anterior end of testis and is typically regionated into seminal vesicle, spermatophoric sac, and ejaculatory duct. (paired, unpaired).
(syn. sperm duct) [Stachowitsch, 1992]
(Taxon-specific: Class Ostracoda) Section of male reproductive system leading from each testis to gonopore. May be expanded to form seminal vesicle, and distal end may be modified as an ejaculatory duct.
(syn. sperm duct) [Stachowitsch, 1992]
(Taxon-specific: Superorder Syncarida) Section of male reproductive system arising from anterior end of each testis and extending to gonopore(s) on ventral surface (sternite) of last (eighth) thoracic somite. [Stachowitsch, 1992]
(Taxon-specific: Order Thermosbaenacea) Elongate, slender section of male reproductive system between each testis and penes on last (eighth) thoracomere. Extends through thorax and abdomen before turning anteriorly to gonopores. Expanded terminally to form seminal vesicle. [Stachowitsch, 1992]
(Taxon-specific: Order Euphausiacea) Section of male reproductive system between each testis (or from each side of unpaired testis) and gonopores on eighth thoracomere. May be expanded distally to form seminal vesicle. (coiled, straight).
(syn. sperm duct) [Stachowitsch, 1992]