Platyhelminthes The Flatworms

Slides:

Advertisements

Similar presentations

Platyhelminthes Acoelomate Flatworms.

Advertisements

Phylum Platyhelminythes

Phylum Platyhelminthes

PoriferaCnidaria Ctenophora Phoronida Ectoprocta Brachiopoda Echinodermata Chordata Platyhelminthes Mollusca Annelida Arthropoda Rotifera Nemertea Nematoda.

Bilateral Symmetry The remaining phyla are all bilaterally symmetrical or at least have primary bilateral symmetry Also called Bilateria the development.

Ch. 34 Platyhelminthes (phylum) Flatworms –Lacks circulatory system –Lacks respiratory system –Bilateral symmetry –Senses and nerves at the anterior end.

Phylum Platyhelminthes The “flat” “worms”

Characteristics of Phylum Platyhelminthes (means “flat worm”)

The Flatworms.  Organ level of organization ◦ Well developed, specialized anatomical structures  Incomplete gastrulation ◦ Gastrovascular cavity with.

PHYLUM The Greek: “platys” means? “flat” + The Greek: “helmins” means? “worm” Platyhelminthes ?

Lecture 9: Phylum Platyhelminthes Part 1

How does Cnidaria fit in? Porifera unknown common ancestor eukaryote multicellular heterotrophic Blastula stage cellular level of organization choanocytes.

Chapter 34. Section 34.1  3 germ layers – ectoderm, mesoderm, and endoderm  acoelomates  Bilateral symmetry  Anterior and posterior ends  Dorsal.

., Phylum: Platyhelminthes Parasite Monster Inside Me Part 2.

FLATWORMS Belong to the KINDGOM ANIMALIA PHYLUM PLATYHELMINTHES.

Bilaterate Phyla. Phylogeny Review ancestor Common metazoan.

Phylum Platyhelminthes

Unsegmented Worms: Flatworms and Roundworms

Phylum Platyhelminthes

Platyhelminthes pt 2 Digene trematodes and tapeworms.

Phylum Platyhelminthes (Flat- worms). General Information Bilaterally symmetrical  Left and right half mirror each other Dorsal-top surface of animal.

Phylum Platyhelminthes: Flat Worms: Planarians, Tapeworms, & Flukes.

Unsegmented Worms 3 Types: I.Phylum Platyhelminthes Flatworms II.Phylum Nematoda Roundworms.

Chapter 34 Section 1 Phylum Platyhelminthes. Structure & Function Bilateral symmetry Ectoderm, endoderm, mesoderm No hollow body cavity- acoelomate.

Flatworms Honors Biology- Spring Phylum Platyhelminthes  Soft, flattened bodies  Bilateral symmetry with cephalization.

FLATWORMS Belong to the KINDGOM ANIMALIA PHYLUM PLATYHELMINTHES.

Acoelomates Phylum Platyhelminthes Phylum Nemertea Phylum Gnathostomulida.

Flatworms Copyright © McGraw-Hill Education Body Structure Flatworms are acoelomates with bilateral symmetry. Belong to phylum Platyhelminthes Thin, flat,

General Characteristics flattened, bilaterally symmetrical have no other body cavity than the digestive cavity (acoelomates) platy = flat & helminthes.

Phylum Platyhelminthes

Phylum Platyhelminthes. 20,000 species. Bilateral symmetry. Flattened dorso-ventrally. Triploblastic. Cephalized !!!

Phylum Platyhelminthes (flatworms) 18,500 spp. most primitive bilateral animals acoelomate triploblastic minimal cephalization no circulatory system nervous.

Simple InvertebratesSection 3 CH27: Sec3 Phylum Platyhelminthes Flatworms.

Ch. 8 Acoelommorpha, Platyzoa, and Mesozoa

Body Cavities  What is between the body wall and the gut?  The simplest animals have this regions packed with body organs, but more complex animals have.

FLATWORMS Belong to the KINDGOM ANIMALIA PHYLUM PLATYHELMINTHES.

Bilaterally Symmetrical Worms Platyhelminthes, Nemertea, Nematoda, Annelida, and 4 unique groups.

Phylum Platyhelminthes Flatworms. Flatworms: The Platyhelminthes Acoelomates: no coelom Bilateral symmetry Cephalization: with simple nervous system in.

Phylum : Platyhelminthes The Flatworms Acoelomates.

3 Worm Phyla (long, thin bodied animals) All eumatazoans (have true tissues) All have bilateral symmetry Develop a coelom → body cavity 1. Phylum Platyhelminthes.

Phylum Platyhelminthes 4 principal types of flatworms

Diversity of Life – Animals (flatworms, tapeworms)

Phylum Platyhelminthes

Unsegmented worms (flatworms & roundworms)

Phylum Platyhelminthes

Platyhelminthes.

FLATWORMS Belong to the KINDGOM ANIMALIA PHYLUM PLATYHELMINTHES.

Platyhelminthes After completing this tutorial you should be able to:

FLATWORMS Belong to the Kingdom Animalia Phylum Platyhelminthes.

The Platyhelminthes (Flatworms)

Platyhelminthes Flatworms.

FLATWORMS Belong to the KINDGOM ANIMALIA PHYLUM PLATYHELMINTHES.

Chapter 10: Phylum Platyhelminthes

FLATWORMS Belong to the KINDGOM ANIMALIA PHYLUM PLATYHELMINTHES.

Phylum Platyhelminthes (Flatworms)

Eumetazoa - animals with tissue

PHYLUM PLATYHELMINTHES

Phylum platyhelminthes

Parazoa no true tissues

KINGDOM ANIMALIA Phylum Platyhelminthes

Platyhelminthes! Bilateral Symmetry!

Phylum Platyhelminthes ( flatworms ) Prepared by : Nada H. Lubbad

CH34: Phylum Platyhelminthes

Radial vs. Bilateral Symmetry

Platy = flat Helminth = worm

Ch. 36 Platyhelminthes (phylum)

FLATWORMS Belong to the KINDGOM ANIMALIA PHYLUM PLATYHELMINTHES.

Presentation transcript:

Platyhelminthes The Flatworms Pechenik: 34,000 spp (Brusca & Brusca: 20,000 spp) Characteristics: Triploblastic Ectoderm, mesoderm, endoderm Acoelomate Bilateral symmetry (w some cephalization) Protonephridia = Organs for excretion/osmoregulation Flatness allows diffusion for gas exchange 80% are parasitic Simultaneous hermaphrodites (monoecious)

Phylum Platyhelminthes Opisthaptor Ectoparasite One host Trematoda Acetabulum endoparasite Mollusc/vertebrate life cycle Cestoda Monogenea Turbellaria Free living Microtriches Scolex Proglottids Cilia lost from ectoderm (parasitic lifestyle) Phylum Platyhelminthes

Class Turbellaria

Class Turbellaria

Class Turbellaria

Class Turbellaria

Class Turbellaria

Class Turbellaria Most are free living Marine & FW Sensory receptors Chemical (auricles) Tactile Light Dugesia sp.

Class Turbellaria Most are free living Marine & FW Sensory receptors Chemical Tactile Light Cephalized Crawl on substrate using cilia Dugesia sp.

Class Turbellaria Incomplete digestive tract Pharynx

Class Monogenea haptor opisthaptor

Class Monogenea Ectoparasites of fish skin and gills Only 1 host

Monogenea Reproduction: Eggs → oncomiracidium larva → attach to fish Larva similar to cestode oncosphere Adults resemble digene trematoda (convergent evolution – life cycles very different)