Exam (elaborations)
USABO BIOSYSTEMATICS QUESTIONS AND ANSWERS
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USABO BIOSYSTEMATICS QUESTIONS AND ANSWERS
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Name: Score:20 Multiple choice questions
Definition 1 of 20
One of two groups of living amniotes; have amniotic eggs and rib-cage ventilation, which are
key adaptations for life on land
Echinodermata (sea stars, sea urchins)
Amphibia (salamanders, frogs, caecilians)
Reptilia (tuataras, lizards and snakes, turtles, crocodilians, bird)
Cnidaria (hydras, jellies, sea anemones, corals)
Definition 2 of 20
Unique stinging structures (nematocysts) housed in special cells (cnidocytes); diploblastic,
radially symmetrical, gastrovascular cavity
Amphibia (salamanders, frogs, caecilians)
Cnidaria (hydras, jellies, sea anemones, corals)
Reptilia (tuataras, lizards and snakes, turtles, crocodilians, bird)
Chondrichthyes (sharks, rays, skates, ratfishes)
Definition 3 of 20
Coelomates with segmented body wall and internal organs (except digestive tract, which is
unsegmented)
Arthopoda (crustaceans, insects, spiders)
Chordata (lancelets, tunicates, vertebrates)
Mollusca (clams, snails, squids)
Annelida (segmented worms)
,Definition 4 of 20
Coelomates with segmented body, jointed appendages, and exoskeleton made of protein and
chitin
Lophophorates: Ectoprocta, Brachipoda
Annelida (segmented worms)
Chordata (lancelets, tunicates, vertebrates)
Arthopoda (crustaceans, insects, spiders)
Definition 5 of 20
Evolved from synapsid ancestors; include egg-laying monotremes (echidnas, platypus);
pouched marsupials (such as kangaroos, opossums); and eutherians (placental mammals such
as rodents, primates)
Chordata (lancelets, tunicates, vertebrates)
Mammalia (monotremes, marsupials, eutherians)
Amphibia (salamanders, frogs, caecilians)
Cnidaria (hydras, jellies, sea anemones, corals)
Definition 6 of 20
Jawless vertebrates; typically feed by attaching to a live fish and ingeting its blood
Cephalochordata (lancelets)
Urochordata (tunicates)
Myxini (hagfishes and relateives)
Petromyzontida (lampreys)
, Definition 7 of 20
Marine suspension feeders; larvae display the derived traits of chordates
Urochordata (tunicates)
Petromyzontida (lampreys)
Actinistia (coelacanths)
Cephalochordata (lancelets)
Definition 8 of 20
Coelomates with bilaterally symmetrical larvae and five-part body organiziation as adults;
unique water vascular system; endoskeleton
Mollusca (clams, snails, squids)
Echinodermata (sea stars, sea urchins)
Arthopoda (crustaceans, insects, spiders)
Chordata (lancelets, tunicates, vertebrates)
Definition 9 of 20
Dorsoventrally flattened, unsegmented acoelomates; gastrovascular cavity or no digestive
tract
Nematoda (roundworms)
Cephalochordata (lancelets)
Dipnoi (lungifhses)
Plathyhelminthes
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