Chordata Flashcards
Invertebrate chordates that look a bit like fish, but do not have fins
Lancelets
A membrane which serves as a transparent eyelid in frogs
Nictitating Membrane
Fishes whose eggs develop and hatch within the mother’s body leading to a “live” birth
Ovoviviearous
An additional respiratory organ in amphibians- it must be kept moist to do its job
Skin
The class of vertebrates which includes birds
Aves
This substance covers the outer surface of most mammals
Hair
A membrane involved in a frog’s sense of hearing
Tempanic
A structure, found in many organisms, through which digestive wastes, urine and gametes leave the body
Cloaca
Structures present in adult amphibians for respiration
Lungs
Fish which have thin fins are called __________
Ray-finned
The jawless fish which produces copious amounts of slime
Hagfish
Glands which produce milk
Mammary glands (titties)
Structures which aid in flight and provide insulation in birds
Feathers
Individual segments which together make up the backbone
Vertebrae
The number of chambers in an amphibian heart
Three
Terrestrial organisms are believed to have evolved from a __________- finned fish ancestor
Lobe-finned
The evolution of these structures in fish was a major advancement in their ability to feed
Jaws
The parasitic jawless fish which sucks the body fluids out of its host
Lampreys
The class of organisms that are aquatic as larvae and terrestrial as adults
Amphibia
Class of vertebrates which have dry, scaly skin, lungs, and terrestrial eggs
Reptilia
Class which includes the sharks, skates and rays
Chonodrichthyes
The hollow nerve cord in chordates located near the ________ surface of the body
Dorsal
Substance found beneath the skin in mammals which conserves body heat and provides a storage form of energy
Subcutaneous Fat
A type of egg which can develop in a terrestrial environment without drying out
Amniotic
Fishes whose young develop inside the mother without the presence of an egg
Viviparous
A supporting rod running through the body at some point in the life span of chordates
Notochord
The number of chambers in a bird’s heart
Four
The class which includes the jawless fishes
Agnatha
The class which includes fish like perch, salmon, and tuna
Osteichthyes
Structures used by fish for respiration
Gills
At some point in their lives __________ pouches, found near the throat region, are present in all chordates
Pharyngeal
Organisms whose body temperature depends on the surrounding environment
Ectotherms
Chordates are characterized by a ______ which extends beyond the anus for at least part of their lives
A tail
Filter-feeding, invertebrate chordates
Tunicates
Large, piercing teeth found on the roof of the frog’s mouth
Vomerine (teeth)
The substance that makes up the skeleton of sharks and rays
Cartilage
Structures covering the outer surface of a fish
Scales
Organisms whose body temperature is regulated internally
Endotherms
Unidirectional respiration is found in these organisms
Birds
The number of chambers found in the heart of a fish
Two
