31 terms

Zoology unit 5 vocab

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Notochord
Rod-like, supportive structure that runs along the dorsal midline of all larval chordates and many adult chordates
Adaptive Radiation
Evolutionary change that results in the formation of a number of new characteristics from an ancestral form.
Operculum
A cover. The cover of a gill chamber of a bony fish.
Lateral Line System
A line of sensory receptors along the side of some amphibians used to detect water movement.
Swim Bladder
A gas-filled sac, usually along the dorsal body wall of bony fishes that regulates the buoyancy of a fish.
Chemoreceptor
A receptor stimulated by the presence of certain chemical substances
Oviparous
Organisms that lay eggs that develop outside the body of a female.
Ovoviviparous
Organisms with eggs that develop within the female reproductive tract and is nourished by food stored in the egg.
Viviparous
Organisms with eggs that develop within the female reproductive tract and is nourished by the female.
Agnatha
Paraphyletic group of vertebrates whose members lack jaws and paired appendages and possess a cartilaginous skeleton.
Chondrichthyes
The class of vertebrates whose members are fish-like, possess paired appendages and a cartilaginous skeleton, and lack a swim bladder.
Osteichthyes
Class of fishes whose members are characterized by a bony skeleton, swim bladder, and an operculum.
Amphibia
Class of vertebrates whose members are characterized by skin with mucoid secretions, which serves as a respiratory organ.
Cloaca
A common opening for excretory, digestive, and reproductive systems
Ureter
Tube conveying urine from the kidneys to the bladder.
Nictitating Membrane
The thin, transparent lower eyelid of amphibians and reptiles
Amniotic egg
The egg of reptiles, birds, and mammals. It has extra embryonic membranes that help prevent desiccation, store wastes, and promote gas exchange. These adaptations allowed vertebrates to invade terrestrial habitats
Amnion
One of the extra embryonic membranes of reptiles, birds, and mammals. The amnion encloses the embryo in a fluid filled sac.
Allantois
One of the extra embryonic membranes in the embryo of an amniote
Chorion
The outer most extra embryonic membrane of the embryo of an amniote. Becomes highly vascular and aids in gas exchange
Endotherm
Having a body temp. determined by heat derived from the animals' own metabolism.
Ectotherm
Having a variable body temperature derived from heat acquired from the environment.
Flight Feathers
Feathers that line the tip and trailing edge of the wing of a bird. They are asymmetrical with longer barbs on one side of the shaft
Airfoil
A surface, such as a wing that provides lift by using currents of air it moves through.
Alula
A group of feathers on the wing of a bird that is supported by the bones of the medial digit. The alula reduces turbulent air flow over the dorsal surface of the wing.
Mammary Glands
The breast in female mammals. The mammary glands produce and secrete milk to nourish developing young.
Mammalia
The class of vertebrates whose members are at least partially covered by hair, have specialized teeth, and are endothermic. Young are nursed from mammary glands.
Placenta
Structure by which an unborn child or animal attaches to its mothers' uterine wall and through which it is nourished.
Cecum
Each arm of the blind-ending, y-shaped digestive tract of trematodes, phylum Platyhelminthes.
Diaphragm
The domed respiratory muscle between thoracic and abdominal compartments of mammals.
Gestation
Period of development of the young in viviparous animals, from the time of fertilization of the ovum until birth
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