ACOELOMATES PHYLUM PLATYHELMINTHES PHYLUM NEMERTINA PHYLUM PLATYHELMINTHES Phylum

ACOELOMATES PHYLUM PLATYHELMINTHES & PHYLUM NEMERTINA

PHYLUM PLATYHELMINTHES

Phylum Platyhelminthes-Class Turbellaria: note pharynx, mouth, intestine [fig 3. 2 -A]

Phylum Platyhelminthes- Class Turbellaria: cross section through middle of organism [fig 3. 4]

Phylum Platyhelminthes- Class Turbellaria: cross section through pharyngeal region- note pharynx, gastric caeca(intestine), mesenchyme [fig 3. 4]

Phylum Platyhelminthes- Class Trematoda View of whole fluke organism.

Phylum Platyhelminthes, Class Trematoda (anterior): note oral sucker, pharynx, caeca & ventral sucker (for attachment) [fig 3. 5]

Phylum Platyhelminthes- Class Trematoda: note eggs, ovaries, shell gland, caeca, uterus and testes) [fig 3. 5]

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

Phylum Platyhelminthes- Class Cestoda: Scolex region-note rostellum & suckers for attachment [fig 3. 7 -A]

Phylum Platyhelminthes- Class Cestoda: mature proglottid w/ reproductive structures [fig 3. 7 -D]

Phylum Platyhelminthes- Class Cestoda: gravid proglottid chock full o’ eggs [close-up of fig 3. 7 -E]

PHYLUM NEMERTINA

Phylum Nemertina: cross section through anterior, note proboscis sitting in the rhynchocoel & the flattened intestine. [fig 4. 3 -B]

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