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Bio ch 11
11-10-09
21
Biology
Undergraduate 1
11/10/2009

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Term
amniote
Definition
Terrestrial vertebrates- reptiles, birds, and mammals, that deposit amniotic eggs, that is eggs protected by a water tight membrane and a shell
Term
artropod
Definition
Members of the invertebrate phylum Arthropoda;characterized by a segmented body, an exoskeleton, and jointed appendages
Term
cephalopod
Definition
Molluscs in which the head is prominent and the foot has been modified into tentacles; examples are octopuses and squids. Cephalopods have a reduced or absent shell and possess the most advanced nervous system of the invertebrates.
Term
deuterostome
Definition
Bilaterally symmetrical animals with defined tissues in which the gut develops from back to front; the anus forms first, and the second opening formed is the mouth of the adult animal.
Term
ectotherm
Definition
Organisms that rely on the heat from an external source to raise their body temperature and seek the shade when the air is too warm
Term
exoskeleton
Definition
A rigid external covering such as found in some invertebrates, including insects and crustaceans.
Term
gastropod
Definition
Molluscs that are members of the class Gastropoda; most have a single shell, a muscular foot for locomotion, and a radula used for scraping food from surfaces; examples are snails and slugs.
Term
lobe-finned fishes
Definition
Fish species characterized by two pairs of sturdy lobe-shaped fins on the underside of the body.
Term
marsupial
Definition
Mammals in which, in most species, after a short period of embryonic life in the uterus, the young complete their development in a pouch in the female
Term
monotreme
Definition
Present-day mammals that retain the ancestral condition of laying eggs; monotremes are so called because they have a single duct, the cloaca, which the reproductive system, the urinary system and the digestive system open into.
Term
notochord
Definition
A rod of tissue from head to tail that stiffens when body when muscles contract during locomotion; primitive chordates retain the notochord throughout life, but in advanced chordates it is present only in early embryos and is replaced by the vertebral column.
Term
pharyngeal slits
Definition
Slits in the pharyngeal region, between the back of the mouth and the top of the throat, for the passage of water for breathing and feeding
Term
placental
Definition
Mammals in which the developing fetus takes nourishment from the transfr of nutrients from the mother through the placenta, which also supplies respiratory gases and removes metabolic waste products.
Term
post-anal tail
Definition
A tail that extends beyond the end of the trunk a point that is marked by the anus; a characteristic of chordates.
Term
protostome
Definition
Bilaterally symmetrical animals with defined tissues in which the gut develops from front to back; the first opening formed is the mouth of the adult animal.
Term
pupa
Definition
In complete metamorphosis, the second stage of insect development, in which the larva is enclosed in a case and its body structures are broken down into molecules that are reassembled into the adult form.
Term
radial symmetry
Definition
A body structure like that of a wheel, or pie, in which any cut through the center would divide the organism
Term
ray-finned fish
Definition
Fish species characterized by rigid bones and a mouth at the apex of the body; they are so called because their fins are lined with hardened rays[image]
Term
sessil
Definition
Describes organisms that are fastened in place, such as adult mussels and barnacles.
Term
tetrapod
Definition
An organism with four legs, all terrestrial vertebrates are tetrapods
Term
viviparity
Definition
The characteristic of bearing young alive, giving birth to babies (rather than laying eggs) lat; vivus=alive + parere to bear
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