Vertebrate Diversity Flashcards
Define Notochord
gelatinous rod that extends down the dorsal part of the organism
What does the notochord become in VERTEBRATES
the vertebral column
what is the hollow dorsal nerve root? (what does it become?)
It becomes the spinal cord.
What do pharyngeal gill slits form into for aquatic animals?
They develop into gills
What do pharyngeal gill slits form into for land animals?
They develop into the throat, larynx, sinus cavities, and other important features in neck area.
What are two examples of non-vertebrate chordates?
Tunicates and lancelets
What are the 5 features that all vertebrates share?
Muscular pharynx, mineralized tissue, neural crest cells, cranium, and a vertebral column.
Define Neural Crest Cells.
Cells that contribute to facial development and CNS development.
What are examples of Chondrichthyes?
Sharks, rays.
What is the skeleton mostly made up of in chondrichthyes?
Cartilage
What is a developed sense that sharks have?
They can detect electric fields.
Why do chondrichthyes continually swim?
It helps with buoyancy and gas exchange.
Is continual swimming mandatory for chondrichthyes?
no
What are the 3 types of reproduction for chondrichthyes?
Oviparous, viviparous, and ovovivaparous
define oviparous
eggs laid, hatch outside female
