Animal Diversity Test 2-Platyhelminthes
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Platyhelminthes are what?
Type of coeloms?
Acelomates-No cavity lined with peritoneum
Only internal organ?
Mesoderm cosists of?
Muscle fibers-replaces mesoglea
Type of symmetry?
Bottom side (name)?
Center of nervous system is the..?
Three germ layers
Mesoderm makes what possible?
Pair of cerebral what?
Type of system organization
Pair of cerebral ganglion are located?
Type or nervous stystem
Primative excretary system. Osmoregulated attached to two canals.
Mouth is located where?
Pharynx does what?
Excretes undigested food
extracellular and intracellular
How they respire-diffusion
What is absent?
Sexually they are?
Monecious-Both sexual organs present
Can also reproduce?
Asexually by fission
Class of Platyhelminthes?
Free-livings Tubellaria, bottom dwellers, marine and freshwater or moist environments (under stones).
Ciliated epidermis, moves on slime layer
Metabolic wastes move by?
Diffusion through body wall
Gas exchange by difussion through body surface
Aasexual, regeneration, fission
Planarians sexual organs
Monoecious, hermaphroditic-also cross fertilization
Another common name for planaria?
How many hosts for cestoda/
Grooves of proglottids are by?
Cestoda have what to increase surgace area?
Microtriches-to increase nutrients uptake-like little roots
Hold-fast organ for attachment
Cestoda-how many sense organs?
Tip of scolex-may or may not have hooks, used to aid in attachment and scraping intestinal cells
- Mature-Contain sex organs
- Gravid-Terminal, shelled, infected larvae (ready to germinate)
- Detached-Gravid proglottid shed in feces-Life cycle starts again
Genus species of beef tapeworm
Characteristics of Taenia saginata
- No hooks, suckers to attach to intestine,
- juveniles found in intermuscular tissue of cattle
- Cysticerci-measly beef-encyst juveniles
- Develop in cattle, reproduce in humans
Taenis solium have what on rostellum?
Hooks and suckers
Life cycle of taenia solium in humans
- Adults>small intestine humans>burrow throught to intestinal wall
- >to blood and lymph
Taenia solium juveniles live where
Muscles in pigs
How are humans infected with Taenia solium?
Eating undercoocked pork-encysted in muscle of meats
Juvenile form of Taenia solium
Taenia solium can cause
Blindness and neurological problems
True coelom (peritoneal cavity) characteristics
- -Hydrostatic skeleton
- -Mesentaries (from mesoderm) support for organs and blood supply
- -Alimentary canal more specialized
- -Formed in mesoderm during embryonic development
- -Lined with peritoneum=layer of mesodermal epithelium
False coelom characteristics
- -First attempt to have fluid-filled body cavity
- -Derived from blastocoel rather than mesoderm
- -Space between gut, mesoderm, and ectoderm
Characteristics of pseudocoelomates
- -Nerve ring or cerebral ganglia connects to posterior and anterior ends
- -Sexes usually separate (dioecious)
- -NO circulatory or respiratory systems
- -Ciliated crowns on their heads called a corona
- -Found in freashwater environments
- -Benthic-bottom dwellers
- -Pelagic-Lives on water sufaces
Nematoda characteristics (basics)
- -12,000 species
- -Terrestrial, marine, freashwater, parasitic
- -Agricultural damage
Nematoda physiological characteristics
- -Cylindrical body
- -Flexable, nonliving cuticle
- -NO cilia or flagella
- -Muscles in body wall run longitudinally only
- -Excretory system-No protonephridia, canal system or gland cells open to pore
- -Mave canals or cells or both for excretion
What does Wuchereia bancrofti cause?
Most common parasite in humans?
- -30% children
- -16% adults
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