PLATYHELMINTHES & PHYLUM NEMERTINA 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

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 1st organism with a COMPLETE digestive tract (i.e. it has an anus) Phylum Nemertina