testis

testis

Male reproductive organ, producing sperm.

The organ which produces the male gametes or spermatozoa.

Paired section of male reproductive system in which sperm are produced. Testes extend through anterior part of trunk, one to each side of midgut; opens to exterior via ventrally directed vas deferens.

Gonad.

Paired section of male reproductive system in which sperm are produced; extends from third or fourth abdominal somite anteriorly to first and second abdominal somites (= genital somites). Each testis opens to exterior via vas deferens and penis.

One of two sausage-shaped sections of male reproductive system in which sperm are produced. Located dorsal to digestive tract and extends from 12th to 7th postcephalic segments; anterior ends joined. Each testis opens to exterior on sixth thoracomere via vas deferens and gonoduct (common male and female duct).

Section of male reproductive system in which sperm are produced. Paired, tube-like, located on each side of pereon. Each testis opens to exterior on last (fifth) pereon segment via vas deferens.

Paired, relatively short section of male reproductive system in which sperm are produced. Both testes open into common seminal vesicle.

Typically paired, expanded section of male reproductive system in posterodorsal region of cephalothorax. Connected by bridge, each testis opening to exterior on basal segment (coxa) of last pereopod via vas deferens. (paired, fused; multilobed, tubular).

Paired section of d reproductive system in which sperm are produced. Elongate, cylindrical, extending between heart and digestive tract from third to sixth pereon segments (pereonites); each testis opens to exterior on last (seventh) pereonite via vas deferens and penis.

Paired section of d reproductive system in which sperm are produced. Located dorsolateral to digestive tract in pereon, each testis opening to exterior on last (seventh) pereon segment via vas deferens.

Paired section of male reproductive system in which sperm are produced. Located in thorax and differentiated into series of spermatic sacs. Opens to exterior via seminal vesicles, vasa deferentia, ejaculatory ducts, and penes.

Section of male reproductive system in which sperm are produced. Elongate, paired, extending from third abdominal somite (pleomere) to telson between heart and digestive glands. Fused posteriorly in telson and opening to exterior on eighth thoracic somite (thoracomere) via vasa deferentia and penes.

In male reproductive system, pair of slender, tubular organs in which sperm are produced. Located between digestive tract and heart and extending through most of body; each tesis opens on coxa of eighth thoracopod via vas deferens.

Paired, expanded section of male reproductive system in abdomen. Each testis is connected to unpaired seminal vesicle in thorax by vas efferens. (elongate elliptical, elongate ovate, lunate).

Large, paired section of male reproductive system in which sperm are produced. Located in anterior region of body and opening to exterior via pair of vasa deferentia and unpaired penis.

Unpaired section of male reproductive system in which sperm are produced; extends throughout posterior region of thoracoabdomen. Bears several pairs of dorsal diverticula and opens to exterior through anteriorly directed vas deferens.

In free-living copepod typically unpaired, in parasitic copepod typically paired, expanded section of male reproductive system in which sperm are produced. Located dorsally, above midgut, near border of head and thorax. Opens to exterior on first abdominal segment (genital somite) via regionated vas deferens. (paired, unpaired).

Section of male reproductive system in which sperm are produced. Located in posterior region of trunk or between body and valve and opening to exterior via vasa deferentia. (paired, unpaired; coiled, elongate, four-lobed = quadripartite, lobed, simple, spheroid, tube-shaped).

Paired section of male reproductive system in which sperm are produced; located ventral and dorsal to midgut in posteriormost seventh to about tenth trunk segment.

In anaspidacean, section of male reproductive system in which sperm are produced. Paired, extending from fifth thoracic somite to posterior end of abdomen. Each testis opens to exterior via vas deferens. Restricted to abdomen in bathynellacean.

Section of male reproductive system in which sperm are produced. Paired, relatively short, located anteriorly in posterior cephalon/first thoracomere region. Each testis opens to exterior on last (eighth) thoracomere via elongate vas deferens.

Section of male reproductive system in which sperm are produced; located between heart and digestive tract in thorax. Each testis (or each side of unpaired testis) opens to exterior on last (eighth) thoracomere via vas deferens.

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