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
A small opening that lies just beneath the mouth.
Gonopore/Genital pore
Small pores found all over the ventral side of their body.
Excretory pores
Flattened, elongated, or leaf-like body.
Class Trematoda
Class Trematoda, the specimen will be:
Fasciola hepatica or Fasciola gigantica
An unciliated epidermis that is tougher and resistant to digestive juices of host.
Syncytial tegument
Found on the anterior end of their body.
Mouth
Located around the mouth, it helps them hold on to hosts tissue while consuming at the same time.
Oral Sucker
(Acetabulum) The larger sucker found on the ventral middle part of their body.
Ventral Sucker
A small opening that lies just in between the oral and ventral sucker.
Genital pore
A single small opening found at the posterior end of the body. It is where metabolic waste and water are released.
Excretory pore
Class Cestoda, the specimen will be:
Taenia solium or Monieza expansa
An unciliated epidermis that is tougher and resistant to digestive juices of host.
Syncytial tegument
The first segment of the tapeworm (not the head).
Scolex
The segmented body of a tapeworm.
Strobilla
Each segment is called a:
Proglottid
An individual reproductive unit.
Proglottid
Segments closer to the scolex are called:
Immature proglottids
Segments further away called:
mature proglottids
The distal-most segments are called:
gravid proglottids
this is small opening where sperm is exchanged and eggs are released.
Gonophore
This refers to a crown of hooks found in the scolex of some tapeworms.
Rostellum
This refers to the larger sucker in the ventral surface of flukes.
Acetabulum
