Planaria  (P: Platyhelminthes C:Turbellaria)

1. Phaynx

2. Gastrovascular Cavity

3. Eye Spot

4. Auricle

Clonorchis sinensis

(P: Platyhelminthes C: Trematoda)

Clonorchis sinensis 

(P: Platyhelminthes C:Trematoda)

Anterior region

1. Mouth

2. Pharynx

3. Esophagus

4. Intestinal cecum

5. Genital Pore

6. Ventral sucker

Clonorchis sinensis 

(P: Platyhelminthes C:Trematoda)

Middle region

1. uterus

2. intestinal ceca

3. yolk glands

4. yolk duct

5. ovary

6. seminal receptacle 

7.testes

8. Excretory bladder

Clonorchis sinensis 

(P: Platyhelminthes C: Trematoda)

Posterior region

1. intestinal ceca

2. testes

3. excretory bladder

4. excretory pore 

Trematode redia 

(P: Platyhelminthes C:Trematoda)

Trematode cercaria 

(P: Platyhelminthes C: Trematoda)

Diplydium caninum 

(P: Platyhelminthes C: Cestoda)

1. scolex

2. immature proglottid

3. mature proglottid 

4. gravid proglottid 

Diplyidium caninum 

(P: Platyhelminthes C: Cestoda)

Mature proglottid magnified 

1. testes

2. vas deferens

3. vagina

4. ovary

5. yolk gland

6. gential pore 

Taenia pisiformis (mature)

(P: Platyhelminthes C: Cestoda)

1. excretory canal

2. testes

3. uterus

4. genital pore

5. vas deferens

6. vagina

7. ovaries

8. yolk glands

Taenia pisiformis scolex

(P: Platyhelminthes C:Cestoda) 

1. strobila

2. suckers

3. hooks

Taenia pisiformis cysticercus

(P: Platyhelminthes C: Cestoda) 

P: Acanthocephala 

1. proboscis 

Plumatella 

(P: Ectoprocta)

Bugula 

(P: Ectoprocta)

1. lophophore

2. avicularium 

Monogenetic fluke 

(P: Platyhelminthes C:Monogenea)

Fasciola hepatica

(P: Platyhelminthes C:Trematoda) 

Paragonimus westermani 

(P: Platyhelminthes C:Trematoda)

Schistosoma mansoni

(P:Platyhelminthes C: Trematoda) 

Clonorchis sinensis 

(P: Platyhelminthes C: Trematoda)

1. Pharynx

2. cerebral ganglia

3. intestinal ceca

4. seminal vesicle

5. uterus 

Clonorchis sinensis 

(P: Platyhelminthes C: Trematoda)

1. Seminal vesicle 

2. uterus

3. intestinal cecum

4. seminal receptacle

5. excretory bladder

6. excretory pore

7. yolk ducts

8.mehlis'  gland

Clonorchis sinensis 

(P: Platyhelminthes C: Trematoda)

1. Mouth 

2. oral sucker

3. esophagus

4. intestinal ceca

5. ventral sucker 

6. genital pore

7. uterus 

8. yolk glands 

Clonorchis sinensis 

(P: Platyhelminthes C: Trematoda)

1. uterus 

2. yolk glands

3. mehlis' gland

4. ovary

5. seminal vesicle

6. testes

7. excretory bladder

8. intestinal cecum 

P: Mollusca

C: Scaphopoda

P: Mollusca

C: Polyplacophora

P: Mollusca

C: Gastropoda

P: Mollusca

C: Gastropoda

P: Mollusca

C: Gastropoda

P: Mollusca

C: Bivalvia

P: Mollusca

C: Bivalvia 

P: Mollusca

C: Cephalopoda

P: Mollusca

C: Cephalopoda

P: Mollusca

C: Cephalopoda

P: Mollusca

C: Cephalopoda

P: Mollusca

C: Cephalopoda

Snail Radula

P: Mollusca

C: Gastropoda 

Veliger Larva

P: Mollusca

C: Gastropods/Bivalves

Glochidium Larva

P: Mollusca

C: Bivalvia

Squid

P: Mollusca

C: Cephalopoda

1. siphon

2. anterior vena cava

3. funnel retractor muscle

4. intestine

5. ink sac

6. gills

7. branchial hearts

8. posterior vena cava

9. intestinal cecum

10. mantle 

11. anus

Male Squid 

P: Mollusca

C: Cephalopoda 

1. circular mantle

2. gills

3. branchial hearts

4. siphon

5.lateral fins

6. eight arms

7. tentacles

8. suckers

9. mouth

10. pen

11. systemic heart

12. anterior vena cava

13. posterior vena cava

14. eyes

15. intestinal cecum

16. anus

17. ink sac

18. penis

Freshwater Mussel

P: Mollusca

C: Bivalvia

1. foot

2. anterior adductor muscle

3. 

4. gills

5. heart

6. dorsal hinge ligament

7. mantle

8. posterior adductor muscle

9. intestine

10. anus

11. ventral inccurent siphon

12. dorsal excurrent siphone

P: Mollusca

C: Bivalvia

1. nacre

2. umbo

3. hinge ligament

4. lateral hinge teeth

5. cardinal hinge teeth

6. anterior adductor muscle

7.posterior adductor muscle

P: Mollusca

C: Bivalvia

1. mantle

2. gills

3. anterior adductor muscle

4. posterior adductor muscle

5. lateral hinge teeth

6. heart

7. pericardial cavity

8. foot

9. digestive gland

10. gonad

P: Mollusca

C: Bivalvia

1. mantle

2. nacre

3. lateral hinge teeth

4. cardinal hinge teeth

5. digestive gland

6. anterior adductor muscle

7. posterior adductor muscle

8. gills

9. labial palps

P: Mollusca

C: Bivalvia 

1. foot

2. anterior adductor muscle 

3. stomach

4. mantle

5. gills

6. posterior adductor muscle

7. nephridium

8. labial palp

9. pericardium

P: Mollusca

C: Bivalvia 

1. Nephridiopore

2. nephrostome

3. pericardium

4. heart auricle

5. heart ventricle

6. gills

7. nephridium 

P: Mollusca

C: Bivalvia 

1. anterior adductor muscle

2. labial palp

3. digestive gland

4. stomach

5. gonad

6. intestine

7. pedal ganglion

P: Mollusca

C: Bivalvia 

1. foot

2. labial palps

3. anterior adductor muscle

4. stomach

5. digestive gland

6. intestine

7. gonad

8. pedal ganglion

P: Mollusca

C: Bivalvia 

1. heart auricle

2. heart ventricle

3. pericardium

4. nephridium

5. gills

6. posterior adductor muscle

7. anus

8. excurrent siphon

9. incurrent siphon

Nereis virens

(P: Annelida C: Polychaeta)

1. Dorsal blood vessel

2. longitudinal muscles

3. coelom

4. lumen of intestine

5. ventral nerve cord

6. ventral blood vessel

7. parapodia

Nereis virens

(P: Annelida C: Polychaeta)

1. Dorsal blood vessel

2. longitudinal muscle

3. cuticle

4. hypodermis

5. circular muscle layer

Lumbricus terrestris 

(P: Annelida C: Oligochaeta)

1. Dorsal blood vessel

2. body wall layers

3. nephridium

4. seta

5. ventral blood vessel

6. ventral nerve cord

7. typhlosole

8.intestinal lumen

9. coelom

Lumbricus terrestris

(P: Annelida C: Oligochaeta)

1. cuticle

2. hypodermis

3. circular muscle

4. longitudinal muscle

(P: Annelida C: Hirudinea)

Proboscis 

(P: Annelida C: Hirudinea)

1. proboscis

2. eye spot

3. proboscis cavity

(P: Annelida C: Hirudinea)

1. male atrium

2. vas deferens

3. salivary glands

4. crop

5. testis

(P: Annelida C: Hirudinea)

1. crop

2. gastric ceca

3. intestinal ceca

(P: Annelida C: Hirudinea)

1. intestine

2. posterior sucker

Nereis virens Parapodium

(P: Annelida C: Polychaeta)

1. dorsal cirrus

2. notopodium

3. setae

4. neuropodium

5. ventral cirrus

6. acicula 

(P: Annelida C: Oligochaeta)

Lumbricus terrestis setae

(P: Annelida C: Oligochaeta) 

Lumbricus terrestris Nephridia

1. nephridia

2. nephridiopore

3. coelom

4. intestinal lumen

(P: Annelida C: Oligochaeta)

1. Intestine

2. ventral nerve cord

3. dorsal blood vessel

(P: Annelida C: Oligochaeta)

1. buccal cavity

2. pharynx

3. crop

4. gizzard

5. dorsal blood vessel

6. seminal vesicles

7. seminal receptacles

8. septa 

9. aortic arches 

(P: Annelida C: Oligochaeta)

1. prostomium

2. mouth

3. buccal cavity

4. pharynx

5. aortic arch

6. nephridia

7. cerebral ganglion

8. circumpharyngeal connective 

9. ventral nerve cord

(P: Annelida C: Oligochaeta)

1. Pharynx 

2. esophagus

3. crop

4. gizzard

5. aortic arches

6. dorsal blood vessel

7. ventral blood vessel

8. nephridia

9. seminal vesicles

(P: Annelida C: Oligochaeta)

1. clitellum

2. crop

3. gizzard

4. chloragogue cells

5. intestine

6. dorsal blood vessel

7. ventral blood vessel

8. setae

9. ventral nerve cord

(P: Annelida C: Oligochaeta)

1. pharynx

2. esophagus

3. aortic arch

4. seminal receptacle

5. seminal vesicle

6. crop

7. gizzard

8. intestine

Ascaris lumbricoides 

(P: Nematoda)

1. cuticle and hypodermis

2. longitudinal muscle

3. vas deferns

4. testis

5. lateral line with excretory canal

6. intestine

7. psuedocoelom

Ascaris lumbricoides 

(P: Nematoda)

1. cuticle

2. hypodermis

3. excretory canal

4. testis

5. vas deferens

6. longitudinal muscles

7.psuedocoelom

Ascaris lumbricoides 

(P: Nematoda)

1. cuticle and hypodermis

2. longitudinal muscle

3. ovary

4. oviduct

5. uterus

6. intestine

Ascaris lumbricoides 

(P: Nematoda)

1. cuticle

2. hypodermis

3. longitudinal muscle

4. ovary

5. oviduct

6. psuedocoelom 

Trichinella spiralis Infected skeletal muscle

(P: Nematoda)

1. encysted larvae

2. skeletal muscle fiber

Ancylostoma caninum 

(P: Nematoda)

1. mouth

Enterobius vermicularis 

(P: nematoda)

1. mouth

Dirofilaria immitis

(P: Nematoda)

Ascaris lumbricoides 

(P: Nematoda)

1. non-muscular intestine 

Ascaris lumbricoides

(P: Nematoda)

1. non-muscular intestine

2. vagina

3. uterus

4. oviducts

Ascaris lumbricoides

(P: Nematoda)

1. uterus 

2. ovary

3. non-muscular intestine

Planaria

(P: Platyhelminthes C: Turbellaria

1. cerebral ganglion

2. ventral nerve cord

3. ocellus

4. auricles

5. testes

6. ovary

7. oviduct

8. circular muscle layer

9. longitudinal muscle layer

Planaria

(P: Platyhelminthes C: Turbellaria)

1. gastrovascular cavity

2. pharynx

3. excretory system

4. ventral nerve cord

5. testes

6. seminal vesicle

7. oviduct

8. parenchyma

Planaria

(P: Platyhelminthes C: Turbellaria)

flame cell

1. cilia

2. collecting duct

3. flame cell nucleus 

4.parenchyma 

(P: Annelida C: Oligochaeta)

1. pharynx

2. esophagus

3. aortic arch

4. seminal receptacle

5. seminal vesicle

6. crop

7. gizzard

8. intestine