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chapter thirty-three: protostomes
Terms in this set (62)
a specialized type of free-living larva found in lophotrochozoans
a horseshoe-shaped crown of ciliated tentacles that surrounds the mouth of certain lophotrochozoan animals
a specialized cell found in the network of tubules inside flatworms that assists in water regulation and some waste excretion
condition in which an organism has both male and female functional reproductive organs
the ciliated first-stage larva inside the egg of the liver fluke
a baglike structure containing embryonic germ cells
a secondary, nonciliated larva produced in the sporocysts of liver flukes
a free-swimming larval stage in which a parasitic fluke passes from an intermediate host (typically a snail) to another intermediate host or to the final vertebrate host
a disease that is caused by a parasitic blood fluke of the genus Schistosoma and that affects the skin, intestines, liver, vascular system, or other organs
the attachment organ at the anterior end of a tapeworm
phylum of worms with a crown of cilia surrounding the mouth
the soft, outermost layer of the body wall in mollusks and secretes the shell
rasping tongue found in most mollusks
a tubular excretory structure in invertebrates
the funnel-shaped opening that leads to the nephridium
the second larval stage of mollusks following the trochophore stage
process in embryonic development where mantle cavity and anus move from posterior location to the front of the body
the siphon through which incoming water enters the body
the siphon through which outgoing water leaves the body
bristles of chitin on each body segment that help anchor during locomotion
one of the paired lateral processes on each side of most segments
any group of lophophorate invertebrates that burrows into soft underwater substrates and secretes a chitinous tube in which it lives out its life
a piercing organ, usually a mouthpart, in some species of invertebrates
morphological differences between the sexes of a species
the appendages immediately posterior to the antennae and used to seize, hold, bite, and chew food
an external skeleton
a compound body section resulting from embryonic fusion of two or more segments
the anterior portion of the body which bears all the appendages
shedding of outer layer
an organ of sight composed of many independent visual units called ommatidia
the visual unit in the compound eyes
a simple light receptor common among invertebrates
a tube for breathing
the smallest branches of the respiratory system and convey air from tracheae
external opening of tracheae in insects
a unique respiratory system consisting of leaflike plants within a chamber
blind tubules opening into the hindgut of terrestrial arthropods
first pair of appendages and usually take the form of pincers or fangs
posterior portion of the body of an arachnid
a pair of specialized appendages found in arachnids
organs at the posterior end of a spider's abdomen that secrete a fluid protein that becomes silk
a larval form characteristic of crustaceans
appendages that occur in lines along ventral surface and are used in reproduction and swimming
flattened appendages at the end of abdomen that act as a tail for a rapid burst of speed
the tail spine of lobsters and crayfish
bristles attached to the nervous system that are sensitive to mechanical and chemical stimulation
a thin membrane associated with tracheal air sacs that functions as a sound receptor
a developmental stage of some insects where the organism is nonfeeding, immotile, and sometimes encapsulated in a cocoon
in the flatworm, flame cells are involved in what metabolic process?
the ______ of a mollusk is a highly efficient respiratory structure.
torsion is a unique characteristic of the...
intelligence and complex behaviors are characteristics of the...
serial segmentation is a key characteristic of which of the following phyla?
the distinguishing feature of the bryozoa and brachiopoda is...
a) a coelom
d) a lophophore
which of the following nematodes cause disease?
a) filarial worms
c) trichina worms
d) all of the choices are correct
all of the choices are correct
in terms of numbers of species, the most successful phylum on the planet is the...
which of the following classes of arthropod possess chelicerae?
which of the following characteristics is not found in the arthropods?
a) jointed appendages
c) closed circulatory system
d) segmented ganglia
closed circulatory system
examples of decapods are...
a) centipedes and millipedes
c) ticks and mites
d) lobsters and crayfish
lobsters and crayfish
to which of the following groups would a species that does not molt, possesses a coelom, and has a trochophore larva belong?
which of the following is most closely related to lobsters and what characteristics are significant in determining this relationship?
nematodes once were thought to be closely related to rotifers due to the presence of a pseudocoelom, but are now considered closer to the arthropods due to...
b) jointed appendages
d) a coelom
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