34 terms

Animal Biology Lab 4

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Phylum Platyhelminthes
flatworms
3 important features of Phylum Platyhelminthes
1. free living (usually) aquatic and parasitic flatworms
2. soft-bodied, bilaterally symmetric
3. triploblastic tissue (acoelomate)
3 Classes under Phylum Platyhelminthes
1. Class Turbellaria
2. Class Trematoda
3. Class Cestoda
Class Turbellaria
Planarians; free living, carnivorous, aquatic forms
Planaria (whole mount slide) structures
eyespots, mouth, gastrovascular cavity, auricles, pharynx
eyespots function
sensory structure that determines intensity and direction of light
auricles
contain chemoreceptors that are used to find food
pharynx
muscular tube for pumping in blood and body fluids from host
Planaria (cross section) structures
gastrovascular cavity, pharynx, cilia, pharyngeal cavity
cilia function
Hairlike projections that extend from the plasma membrane and are used for locomotion
pharyngeal cavity
throat
Class Trematoda
Flukes; parasitic w/ wide range of invertebrate & vertebrae hosts, suckers for attachment to host
Human Liver Fluke (Clonorchis sinensis) structures
oral sucker, ventral sucker, pharynx, testes, uterus, gastrovascular cavity, excretory pore, yolk glands
oral sucker function
specialized for attachment to host, used in feeding
ventral sucker function
secondary point of attachment to host
testes function
produce sperm
uterus function
shelled, fertilized eggs are stored here until release through genital pore
excretory pore function
releases metabolic waste products out of the body
yolk glands function
eggs are combined with yolk and shelled before passing to the uterus
Class Cestoda
Tapeworms; parasitic in most vertebrate hosts, complex lifecycle w/ intermediate and multiple hosts, obtains food using microtriches
Taenia (tapeworm) structures
scolex, hooks, suckers, neck, immature proglottids, mature proglottids, gravid proglottids
scolex function
anterior end of a tapeworm; lacks sensory structures but possesses modifications for attachment to intestinal wall of host
hooks & suckers function
modified structures on scolex for attachment to host
neck function
constricted portion signifying posterior end of scolex; marks the site of origin of immature proglottids
immature proglottids function
newly produced segment of the tapeworm that has undeveloped reproductive organs
mature proglottids function
Sexually maturing section of a tapeworm
gravid proglottid function
tapeworm segment containing ripe fertilized eggs; this segment is ready to drop off the tapeworm body and be eliminated from the host in feces
Phylum Nematoda
Roundworms
3 important features of Phylum Nematoda
1. pseudocoelom w/ complete digestive tract
2. usually dioecious
3. free living and parasitic members
Ascaris (under Phylum Nematoda) structures
mouth, pharynx, pseudocoelom, anus, cuticles, lateral line, spicules (on male), seminal vesicle (on male), uterus (on female)
cuticle function
flexible exoskeleton that permits locomotion, confers environmental protection, and allows growth by molting
lateral line function
excretory system of the roundworms, releasing nitrogenous wastes in the form of ammonia and urea
spicules function
open the vulva of females & facilitate the transmission of sperm
seminal vesicle function
transports mature sperm out of the nematode