Lab 9 Flashcards
Pseudocoelomate is associated with?
Nematoda
- tube within a tube
- body cavity located between themesoderm and endoderm
- Psuedoceol
Coelomate is associated with?
Annelida:
- body cavity develops within mesodermal layer
- organs completely held by mesoderm
- true coelom
Phylum Platyhelminthes characteristics
- Dorsoventrally flattened
- Cephalization: evolution of head/brain in anterior end of animals, through to be a result of bilateral symmetry
- No circulatory system: diffusion limited as far as nutrient and oxygen transport(passive diffusion)
- Monoecious: hermaphroditic
- Regeneration
- Many are parasitic: live within bodies of animals, (flukes, tapeworms)
Phylum: Platyhelminthes (flatworms)
- Subphylum: Neodermata-Parasitic flukes
- -Class Trematoda Characteristics?
- Parasitize vertebrates-including humans
- Endoprarasites-live inside hosts
- adults lack cilia, eyespots, sensory organs
- Ectoparasites-parasitize surface of their host
- Complex lifecycle- usually involves two hosts
What are the to parts to the complex life cycle and an example?
- intermediate host: Mollusk
- if second intermediate host: usually a fish or arthropod
- Definitive host: always a vertebrate
Platyhelmithes
Class: Ceromeromorpha (Parasitic Tapeworms)
Segmentation: flexibility, specialization of compartments.
Protolitid=chain of multiple cells
They have indeterminate growth
Beef tape worms are the most highly derived: True or False
True
Phylum Nematoda (round worms): Psuedocoelomates characteristics?
- Hydrostatic skeleton: fluid pseudocoel is pressurized
- only longitudinal muscles-sand and vinegar
- so circulatory system or specialized gas exchange
- complete digestive cavity (mouth, gut and anus)
- some are dioecious
Phylum Nematoda Genus: trichinella give birth to …?
Where does it come from?
live young
under cooked meat
What is the Ascaris Lumbricoides like?
- female is larger=sexual dimorphism
- male has hooked posterior
-there is no mesoderm
Phylum Annelida: polychaetes, earthworms, and leeches have Coelomates-characteristics?
- parasitic or free living
- segmentation: specialization of segments
- improve hydrostatic skeleton
- circular and longitudinal muscles: facilitate movement
- closed circulatory system: carries blood from segment to segment
What help the Polychaeta Marine worms move and what else are the used for? What do they have for segments?
parapodia and used for filter feeding.
sedi, none of the others have this.
The Acoelomate body is associated with?
platyhelmithes (flatworms: planarians, flukes, tapeworms)
- lack an internal body cavity
- digestive tract is incomplete
Pseudocoelomate is associated with? Characteristics?
Nematoda
- body cavity located between mesoderm and endoderm
- Psuedoceol
- tube within a tube
Coelomate is associated with? Characteristics?
Annelida
- body cavity develops whithin mesodermal layer
- Organs completely held by mesoderm
- True coelom
Platyhelminths which are Acoelomates are __________ flattened.
Dorsoventrally
What does Cephalization of the Phylum Platyhelminthes mean?
evolution of head/brain in anterior end of animals, thought to be the resold of bilateral symmetry.
Since the Platyhlminthes to not have a circulatory system; diffusion is limited as fare as nutrient and oxygen transport. So how does the platyhelminthe absorb the nutrients?
passive diffusion
What kind of digestive cavity does the platyhelminthe have, and what does it mean?
incomplete digestive cavity: mouth=anus(blind digestion)
Are the platyhelminths monecious? and what does it mean?
yes: means hermaphroditic
Are platyhelminthes parasitic? if they are where do they live?
yes many of them are
they live within bodies of animals (flukes, tapeworms)
Are the subphylum neodermata parasitic flukes as well as under the phylum Platyhelmithes?
Yes
Subphylum: neodermata- class Trematoda are what kind of parasites?
parasitize vertebrates
Define edopararasites
how are they able to do this?
What do the adults have and not have?
live inside host
possess epicuticle that resists their hosts digestive enzymes and immune defense
lack cilia, eyespots, sensory organs
Define ectoparasites
parasitize surface of their host
Define complex lifecycle
usually involves 2 hosts
- intermediate host: mollusk
- if 2nd intermediate host: usually a fish or arthropod
- Definitive host: always a vertebrate.
What is the class and phylum name for parasitic tapeworms?
What does segmentation allow for in the tapeworms?
Class: Cercomeromorpha
Phylum: Platyhelmithes
flexibility and specialization of compartments
What is the most highly derived tapeworm?
beef tapeworm
Phylum Nematoda (round worms): Psuedocoelomtes only have ___________ muscles.
Longitudinal
What kind of skeleton do Nematoda (round worms) have?
Hydrostatic
What do Nematoda have that the Platyhelmethes do not have?
What other specialization do they have?
Complete digestive cavity
Some are dioecious
What class are Earthworms in?
Clitellata
What class and phylum are Hirudinea-leaches in?
Phylum: Annelida
Class: Clitellata
What is a characteristic of a Hirudinea-leech?
Dorsoventrally flattened
Anterior/posterior sucker for capturing/holding prey
What characteristic do earthworms and hirudinea-leeches share?
monoecious-clitellum isn’t obvious except during reproduction (just in leeches)
Segmentation is also not as obvious
What do the Hirudinea leeches have so that the blood can not clog?
Anticoagulant
