More for Chordata + Agnatha test Flashcards
what is the function of the pineal organ?
light detector that helps set the lamprey’s biological clock
2 functions of buccal papillae
assist in forming water tight seal for attachment to objects & sensory
How adults Lampreys eat
eat fish by attaching to them and eating their flesh, blood + body fluids
How feeding habits of adult lamprey differ from larval stage?
Adult - attach to fish to eat their flesh
Larval stage - filter feed
How is cloaca different from anus
Anus - empties solid waste
Cloaca - empties gametes and digestive wastes
What is the function of the olfactory sac
sense of smell
What is the function of the lateral line system?
detect vibration
Phylum, subphylum, and class that includes hagfish
Chordata, Hyperotreti, Myxini
Phylum, subphylum, and class that includes lamprey
Chordata, Vertebrata, and Cephalaspidomorphi
What type of material makes up all agnathans
fiber and cartilage
What is the function of the endostyle
secretes mucus that traps food
What is the function of the notochord?
Structural support
What is the function of the Hepatic cecum
digestive gland that aid in digestion
What is the function of the myomere
interlocking muscles that allow for lateral movement
What is the function of the atriopore
allows water to exit the body
How reproduction in tunicates is different from lancelets
Tunicates = monoecious internal and external fertilization, Larva have all 5 chordata characteristics
Lancelets = dioecious, external fertilization, bilaterally symmetrical larva
Similarities in tunicates and lancelets
-marine and filter feeders
Differences in tunicates and lancelets
Tunicates lose notochord & tail as adult, have a ventral heart
Lancelets = retain all 5 chordate characteristics, no heart
How do lampreys promote blood flow?
lampreys inject an anticoagulant into the wound
What happens to non parasitic lampreys?
spawn and die after adulthood without ever feeding
What do lampreys do in winter and spring
return to freshwater to breed in winter and spring
What do male lampreys do?
build nests using oral discs to gather rocks
what happens during lamprey egg laying
female attach to rock, male attach to dorsal side of female head during egg laying
What are lamprey larva called?
Ammocoetes
How long does larval stage for lampreys last
larval period from 3-7 years and rapidly metamorphosis into adult (spend majority of their life as larva)
Hagfish do not have?
No larval stage
