1. PLATYHELMINTHES & PHYLUM NEMERTINA
ACOELOMATES
PHYLUM
PLATYHELMINTHES & PHYLUM NEMERTINA

2. PHYLUM PLATYHELMINTHES

3. Phylum Platyhelminthes-Class Turbellaria: note pharynx, mouth, intestine [fig 3.2-A]

4. Phylum Platyhelminthes- Class Turbellaria: cross section through middle of organism [fig 3.4]

5. Phylum Platyhelminthes- Class Turbellaria: cross section through pharyngeal region- note pharynx, gastric caeca(intestine), mesenchyme [fig 3.4]

6. Phylum Platyhelminthes- Class Trematoda
View of whole fluke organism.
Phylum Platyhelminthes- Class Trematoda

7. Phylum Platyhelminthes, Class Trematoda (anterior): note oral sucker, pharynx, caeca & ventral sucker (for attachment) [fig 3.5]

8. Phylum Platyhelminthes- Class Trematoda: note eggs, ovaries, shell gland, caeca, uterus and testes) [fig 3.5]

9. Phylum Platyhelminthes- Class Cestoda
Scolex and maturing proglottids. The most reproductively mature segments are at the posterior end of the tapeworm.

10. Phylum Platyhelminthes- Class Cestoda: Scolex region-note rostellum & suckers for attachment [fig 3.7-A]

11. Phylum Platyhelminthes- Class Cestoda: mature proglottid w/ reproductive structures [fig 3.7-D]

12. Phylum Platyhelminthes- Class Cestoda: gravid proglottid chock full o’ eggs [close-up of fig 3.7-E]

13. PHYLUM NEMERTINA

14. Phylum Nemertina:
cross section through anterior, note proboscis sitting in the rhynchocoel & the flattened intestine. [fig 4.3-B]

15. Phylum Nemertina Note proboscis which sits in the rhynchocoel.
This is our 1st
organism with a
COMPLETE
digestive tract
(i.e. it has an
anus)
Phylum Nemertina