Lab 4: Phyla Rotifera, Platyhelminthes, & Nemata

What phylum is under Basal Lophotrochozoa?

Rotifera and Platyhelminthes

What clade is Phylum Nemata under?

Ecdysozoa

Wheel organ/corona

Rotifera
generates current to direct food particles into mouth

Food and pedal glands

Rotifera
attach to a substrate while feeding

Anhydrobiosis

Rotifera
allows terrestrial species to desiccate and survive long periods without water

What asexual reproduction mode does Phylum Rotifera go through?

parthenogensis

Parthenogenesis

growth/development of embryos occur without fertilization

Amictic female

produce eggs that develop without fertilization

What type of eggs are produced under stress?

mictic

Unfertilized, haploid eggs develop into

males

Fertilized, dormant eggs develop into

amictic females

What are the classes of Phylum Rotifera

Seisonidea
Monogononta
Bdelloidea

Which class has corona with 2 trochal discs

Bdelloidea

Mastax

Bdelloidea
masticates food particles

Lorica

Bdelloidea
hard covering around body

Protonephridia

Platyhelminthes
excretory organs that maintain water balance
consist of flame bulbs/flame cells

What are the classes of Phylum Platyhelminthes?

Turbellaria
Monogenea
Trematoda
Cestoda

Class Turbellaria is also known as

Planarians

Auricles

Turbellaria
chemosensory and tactile sensation cells

Ocelli (eyespots)

Turbellaria
photosensitive cells

Class Monogenea are

parasitic, monogenetic flukes

Class Trematoda are

parasitic, digentic flukes

Class Cestoda are

tapeworms

Class Cestoda’s body consist of

scolex and strobila

Ecdysis

Ecdysozoa
process of shedding a cuticle

Phylum Nemata

cuticle
longitudinal muscles
heartworm/elephantiasis

What are the classes of Phylum Nemata?

Enoplea
Chromadorea

What do male Ascaris sp. have on their tail?

hooked structure

Sexual reproduction in Phylum Plateyhelminthed

cross fertilization and self fertilization

Asexual reproduction in Phylum Platyhelminthes

transverse fission