1

BIO2135 – Animal Form and Function

Phylum PlatyhelminthesMiller and Harley Chap. 10

BIO2135 – Animal Form and Function

Platyhelminthes Phylogeny

Fig. 10.1

BIO2135 – Animal Form and Function

Lophotrochozoa

Fig. 10.2

2

BIO2135 – Animal Form and Function

Lophotrochozoa PhylogenyFlat bodies

Platyzoa

Lophozoa

Trochozoa

BIO2135 – Animal Form and Function

Platyhelminthes Taxonomy● Class Turbellaria

– Free-living & mostly aquaticflatworms

● Class Trematoda– Endoparasites of molluscs &

vertebrates, trematodes

● Class Monogenea– Ectoparasites of vertebrates,

flukes

● Class Cestoidea– Endoparasites of crustacea &

vertebrates

BIO2135 – Animal Form and Function

Class Turbellaria

Fig. 10.3

Dorso-ventral muscles

3

BIO2135 – Animal Form and Function

Feeding and Digestion

Fig. 10.5

Ocellus

BIO2135 – Animal Form and Function

Planarian Feeding

BIO2135 – Animal Form and Function

Osmoregulation: Protonephridia

Fig. 10.6

4

BIO2135 – Animal Form and Function

Nervous System

Auricle

Fig. 24.7 & 24.17

BIO2135 – Animal Form and Function

Reproduction

Fig. 10.8 Fig. 10.9

BIO2135 – Animal Form and Function

Planarian Sexual Reproduction

5

BIO2135 – Animal Form and Function

Class Trematoda

Fig. 10.16 & 10.11

BIO2135 – Animal Form and Function

Trematoda Lifecycle

Fig. 10.12 & 10.13

BIO2135 – Animal Form and Function

Class Monogenea

6

BIO2135 – Animal Form and Function

Class Cestoidea

Fig. 10.16

BIO2135 – Animal Form and Function

Cestoidea Lifecycle

Fig. 10.17

& 10.18

BIO2135 – Animal Form and Function

Diffusion

Fig. 26.11

7

BIO2135 – Animal Form and Function

Next Class● Bryozoa - Lophophora