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31 Cards in this Set
- Front
- Back
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what is a coelem?
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an internal, fluid filled, body cavity that is lined with mesoderm
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what does a coelem do?
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acts as a hydrostatic skeleton for support and for motion
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what classes in the phylum annalida have a coelem?
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oligochaeta, hirudinea and polychaeta
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which classes in the phylum annalida have a clitellum and when?
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the class oligochaeta has a clitellum at all times.
the class hirudinea has a clitellum during the reproductive season |
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what is a clitellum and what is it for?
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in the classes oligochaeta and hirudinea, the clitellum secretes a viscous fluid that form a cocoon after copulation for sperm and egg to be deposited into.
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defining characteristics of the class oligochaeta?
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no parapoida and few setae
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defining characteristics of the class polychaeta?
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segmented, many parapoida and many setae
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defining characteristics of the class hirudinea?
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mainly parasitic, has no parapoida, two suckers, one at the mouth for feeding and one at the tail for grip
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what are the positive effects of earthworms on soil structure?
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they leave tunnels in the soil which make water transport easier to the root systems of plants and allow them to receive more nutrients
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what is the ecdusozoan?
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it is a group of protostome animals consisting of the phylum annalida and nematoda
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what are the common names of the phyla Tardigrada and Onychophora
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tardigrada = water bear
onychophora= velvet worm |
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what is cryptobiosis?
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a reversible state in which an animals metabolism has come to a virtual standstill
ex: waterbear |
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what is cryobiosis?
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a resitance to cold and ability to survive frigid extraterrestrial environments
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what is the earthworn phylum, class, order and genus
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annalida, oligochaeta, lumbricus
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what is the leech and clam worm, phylum, class, order and genus?
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leech= annalida, hirudinea, leech
clam worm= annalida, polychaeta and clam worm |
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function of the setae?
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they prevent backsliding in motion
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function of the clitellum?
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secretion of an egg sac in annalida reproduction
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frunction of the mouth?
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ingesting nutrient from their intended medium.
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what is the function of the pharynx?
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used for getting food into the mouth
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what is the function of the calciferous glands?
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small round extensions of the esophagus which secrete calcium ions into the esophagus
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what is the function of the crop?
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a thin walled storage structure in line with the esophagus
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what is the function of gizzard?
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a grinding structure with thick muscular walls
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what is the function of the intestine?
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digestion and absorption
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what is the function of the anus?
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excretion of wastes
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what is the function of the hearts?
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to circulate blood
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what is the function of the dorsal and ventral blood vessels?
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main pumping structures in which blood moves through
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what is the function of the nephridia?
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coiled tubules that form a cone shaped nephrotosome
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what is the function of the dorsal ganglion?
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nerve fibers that innervate structures in each segment
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what is the function of the ventral chord?
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the nerve chord responsible communications
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what is the function of the seminal vesicles?
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the testicle sacs and sperm sacs within the annalida
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what is the function of seminal receptacles?
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storage of sperm prior to copulation
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