BIO044 (LAB) MOD 9 PLATYHELMINTHES (FLATWORMS) Flashcards
Are known as the flatworms:
Phylum Platyhelminthes
Parasitic flatworms are known as:
Flukes and tapeworms
Exhibit many advances over the cnidarians.
flatworms or Phylum Platyhelminthes
flatworms or Phylum Platyhelminthes are:
Triphoblastic:
Ectoderm
Endoderm
Mesoderm
Phylum Platyhelminthes are best characterized by having a:
Dorsoventrally flattened body. Also, bilaterally symmetrical.
Phylum Platyhelminthes, internally they do not have a body cavity:
Acoelomate
The Platyhelminthes is the simplest phylum of animals that has now developed an:
Organ-system level of complexity
but it is still classified under:
Tissue-organ level
is composed of many protonephridia
Excretory system
Flatworms always practice:
cross-fertilization
Phylum Platyhelminthes first phylum in which there is a distinct head with:
sense organs and central nervous system (cephalization)
They have a primitive brain known as the:
cerebral ganglia
4 class under Phylum Platyhelmithes:
- Class Turbellaria
- Class Monogenea
- Class Cestoda
- Class Trematoda
1 group that is free-living
Class Turbellaria
1 group that is parasitic in fishes
Class Monogenea
2 groups that are internal that are parasites of man and domestic animals.
Class Trematoda and Class Cestoda
An organism that supports the immature form of the parasite.
Intermediate host
An organism where the parasite can reach maturity and may develop sign of disease.
Final/ Definitive host
Class Turbellaria the specimen will be:
Dugusia spp.
Class Turbellaria:
- Ciliated epidermis
- Auricles
- Ocelli
- Mouth
- Gonopore/ Genital pore
Helps the planarian grip on surfaces and retain moisture.
Ciliated epidermis
The ear-like flaps at the side of the head have a tactile function that helps the planarian feel its surrounding.
Auricles
Ocelli
The 2 black eyespots.
Located at the ventral middle part of their body.
Mouth
