USABO PHYLOGENY ACTUAL EXAM
QUESTIONS WITH CERTIFIED
ANSWERS
cephalochordata - Answer-basal chordates; marine suspension feeders
urochordata - Answer-marine suspension feeders; larvae display the derived traits of
chordates
myxini and petromyzontida - Answer-jaw less aquatic vertebrates with reduced
vertebrae
hagfishes (myxini) - Answer-head with a skill and brain, eyes, and other sensory organs
lampreys (petromyzontida) - Answer-feed by attaching to a live fish and ingesting its
blood
chondricythytes - Answer-aquatic gnathostomes; have cartilaginous skeleton
acinopterygii - Answer-aquatic gnathostomes; have bony skeletons and maneuverable
fins supported by rays
actinistia (coelacanths) - Answer-ancient lineage of aquatic lobe-fins still surviving in
Indian Ocean
dipnoi - Answer-freshwater lobe-fins with both lungs and gills; sister group of tetrapods
amphibia - Answer-have four limbs descended from modified fins; most have moist skin
that functiosn in gas exchange; mayn live both in water and on land
reptilia - Answer-one of two groups of living amniotes; have amniotic eggs and rib cage
ventilation
mammalia - Answer-evolved from synapsid ancestors
Chytridiomycota (chytrids) - Answer-flagellated spores; fungi
Zygomycota (zygomycetes) - Answer-resistant zygosporangium as sexual stage; fungi
QUESTIONS WITH CERTIFIED
ANSWERS
cephalochordata - Answer-basal chordates; marine suspension feeders
urochordata - Answer-marine suspension feeders; larvae display the derived traits of
chordates
myxini and petromyzontida - Answer-jaw less aquatic vertebrates with reduced
vertebrae
hagfishes (myxini) - Answer-head with a skill and brain, eyes, and other sensory organs
lampreys (petromyzontida) - Answer-feed by attaching to a live fish and ingesting its
blood
chondricythytes - Answer-aquatic gnathostomes; have cartilaginous skeleton
acinopterygii - Answer-aquatic gnathostomes; have bony skeletons and maneuverable
fins supported by rays
actinistia (coelacanths) - Answer-ancient lineage of aquatic lobe-fins still surviving in
Indian Ocean
dipnoi - Answer-freshwater lobe-fins with both lungs and gills; sister group of tetrapods
amphibia - Answer-have four limbs descended from modified fins; most have moist skin
that functiosn in gas exchange; mayn live both in water and on land
reptilia - Answer-one of two groups of living amniotes; have amniotic eggs and rib cage
ventilation
mammalia - Answer-evolved from synapsid ancestors
Chytridiomycota (chytrids) - Answer-flagellated spores; fungi
Zygomycota (zygomycetes) - Answer-resistant zygosporangium as sexual stage; fungi
