Excretory & Reproductive Anatomy

Excretory & Reproductive Anatomy

Excretory & Reproductive- Close anatomical ties

Excretory & Reproductive- Close anatomical ties

Typical vertebrate arrangement

Excretory and reproductive anatomy closely tied

May share common ductwork in some individuals

Typical vertebrate arrangement

Excretory and reproductive anatomy closely tied

May share common ductwork in some individuals

Excretory/Reproductive Systems

Excretory/Reproductive Systems

General locationsGeneral locations

KidneysKidneys

Excretory/Reproductive Systems

Excretory/Reproductive Systems

Systems lie in close proximity to one another within body cavity

Systems lie in close proximity to one another within body cavity

Excretory SystemExcretory System

Pronephros - functional in adult hagfish, fish embryos

Pronephros - functional in adult hagfish, fish embryos

Excretory SystemExcretory System

Mesonephros - portion of functional kidney in adult fish

Mesonephros - portion of functional kidney in adult fish

Typical connections with circulatory system

Typical connections with circulatory system

Fish kidneysFish kidneys

Diffuse organs on either side of vertebral column

Varying degree of connection with reproductive system

Little connection in most advanced fishes

Diffuse organs on either side of vertebral column

Varying degree of connection with reproductive system

Little connection in most advanced fishes

Shark kidneyShark kidney

Sharks and relatives have close ties between kidneys and testes

Share ductwork

Sharks and relatives have close ties between kidneys and testes

Share ductwork

Kidneys and urinary bladder

Kidneys and urinary bladder

Some fish have a urinary bladder Located at end of ureter(s) More often present in male fish

Some fish have a urinary bladder Located at end of ureter(s) More often present in male fish

HagfishesHagfishes

Monoecious - all individuals have capacity to be either male or female

Single gonad can develop into testis or ovary Can it switch or be both at same time?

Monoecious - all individuals have capacity to be either male or female

Single gonad can develop into testis or ovary Can it switch or be both at same time?

Hagfish ovaryHagfish ovary

Produces few, large eggs 1 or 2, or up to 30, depending on

species

Produces few, large eggs 1 or 2, or up to 30, depending on

species

Hagfish ovaryHagfish ovary

Eggs get dumped into body cavity before exiting body

Internal/self fertilization?

Eggs get dumped into body cavity before exiting body

Internal/self fertilization?

Lamprey ovary or testisLamprey ovary or testis

Lampreys are male or female

Single ovary or testis

Reproductive products dumped into body cavity before exiting (no ductwork)

Lampreys are male or female

Single ovary or testis

Reproductive products dumped into body cavity before exiting (no ductwork)

Class ChondrichthyesClass Chondrichthyes

Sexes separate and fertilization internal

Oviparous, ovoviviparous, viviparous

Sexes separate and fertilization internal

Oviparous, ovoviviparous, viviparous

Shark testesShark testes

Paired testes Located near

anterior end of body cavity

Paired testes Located near

anterior end of body cavity

Testes with ductsTestes with ducts

DuctworkDuctwork

Ducts convey sperm to storage area Stored until copulation

Ducts convey sperm to storage area Stored until copulation

Female sharksFemale sharks

External sex characteristicsExternal sex

characteristics Pelvic claspers in

males Aid in sperm

transfer to female Female with

simple cloacal opening

Pelvic claspers in males

Aid in sperm transfer to female

Female with simple cloacal opening

Other characteristicsOther characteristics

Male sharks, chimaeras may have head clasper as well as well as pelvic clasper

Not used in sperm transfer

Male sharks, chimaeras may have head clasper as well as well as pelvic clasper

Not used in sperm transfer

Bony fishes-paired gonadsBony fishes-paired gonads

Bony fishesBony fishes

Most bony fish are dioecious (male and female)

Gender differences not always very apparent

Tubercles may develop in males

Most bony fish are dioecious (male and female)

Gender differences not always very apparent

Tubercles may develop in males

Breeding or nuptial tubercles

Breeding or nuptial tubercles

Bony fishesBony fishes

Others may develop vivid colors Males boldly marked Many minnows, darters

Others may develop vivid colors Males boldly marked Many minnows, darters

Bony fishesBony fishes

Fertilization is usually external (oviparous) Female ejects eggs, male ejects sperm

(milt)

Fertilization is usually external (oviparous) Female ejects eggs, male ejects sperm

(milt)