Pseudocoelomates: Phylum Nematoda Rotifera

Question 1

Phylum Platyhelminthes

Answer 1

Flatworms

Question 2

Characteristics of the flatworm

Answer 2

• Includes planarians, fluke worms, tapeworms
• Bilateral symmetry
• Dorso-ventrally flatterned
• “Organ” level of organization
• Acoelomate body organization
• Digestive system (but mouth only, no anus: cannot feed, digest, and eliminate food simultaneously)
• Primitive excretory system
• Absence of circulation system

Question 3

Clasification of the flatworms

Answer 3

Class Tubellaria: free living planarians
- significance of flatness; feeding structure of the gut; sexual reproduction and asexual fragmentation; regenerative abilities

Question 4

Clasification of flatworms
Class trematoda:

Answer 4

• Flukes
• all parasitic; feeding structure of the gut; attachment suckers; sexual (and asexual) reproduction ; simultaneous hermaphrodites; complex life cycle often involving multiple hosts; primary and intermediate hosts

Question 5

class cestoda

Answer 5

tapeworms
- Attachment suckers & hooks at head end; segments produced behind head; sexual mature segments; gravid segments containing fertilized eggs; complex life cycle, often involving multiple hosts; primary and intermediate hosts

Question 6

The Pseudocoelomates

Answer 6

• Pseudocoelomate body organization:
• false: body cavity “simple” body cavity
• coelomic body cavity partially lined with mesodermal tissue (parietal periotoneum only)
• we developed organs, digestive system (mouth and anus), but no circulatory system
• phylum Nematoda (round worms)- now in Ecdysozoa

Question 7

The Pseudocoelomates

Answer 7

• Body organization:
• “False” body cavity, “ simple” body cavity
• coelomic body cavity partially lined with mesodermal tissue ( parietal peritoneum only)
• well developed organs, digestive system (mouth and anus), no circulatory system
• Phylum Rotifera and Phylum Nematoda

Phylum Rotifera (ehrrl animals)

Question 8

Caduceus

Question 9

Clasification of arthopods

Phylum Arthtopoda

Answer 9

• Subphylum Trilobitomorpha: trilobites

Question 10

Subphylum Chelicerata:

Answer 10

• Class Eurypterida: Eurypterids (extint)
• Class Merostna

Question 11

Phylum Arthropoda: Subphylum Chelicerata

Answer 11

• Class Eurypterida(eurypterid Extinct)
• Class Merostomata (horseshoe crabs, extant)
• class Arachnida: spiders, scorpions, mites & ticks
• class phycnogonida; sea spiders

Question 12

Phylum Arthropoda: Subphylum Chelicerata: Class Arachnida

Answer 12

• ## Spiders: Daddy long legs, Scorpions, Ticks and mites

Question 13

Subphylum Mandibula

Class Crustacea

Answer 13

• Order Decapoda: Lobsters, crabs, shrimp
• many other orders

Question 14

Class Myriapoda

Answer 14

• Order chilopoda: Centipedes
• order diploda: Millipedes

Question 15

Class insecta(hexapoda):

Answer 15

• Insects
• many orders of insect; we will explore a few

Question 16

Phylum Arthtopoda: appendages

Answer 16

• Chelicerae: mouthparts of chelicerates
• mandibles: mouthparts of mandibulates (crustanceans and insects)
• Biramous: appendages of crustaceans and chelicerates
• Uniramous: appendages of insects

Question 17

Class crustacea

Answer 17

• Order Decapoda
• order cirripedia
• order isopoda
• order copepoda

Question 18

Class Myriapodia

Answer 18

• Order Chilopoda (centipedes)
• ## order diplopoda (millipedes)