Chapter 13-Vertebrates, Part 1 Flashcards
What class to cartilaginous fishes belong to?
Class Chondrichthyes
What are characteristics of Class Chondrichthyes?
carilaginous endoskeletons, powerful jaws, well-developed sense organs
The majority of Chondrichthyes belong to what subclass?
sharks, skates, rays
T/F Gills occur in rows of 5-7 and lack moveable gill covers in Elasmobranchs.
True
T/F Elasmobranchs possess paired pelvic and pectoral fins which improve stabilization and maneuverability.
True
What do Chondrichthyes rely on for buoyancy?
body shape and oil-filled liver
What are the teeth of Chondrichthyes called?
placoid scales
What is unique about the receptors of Chondrichthyes?
receptors in nostrils and epidermis detect smells and electrical fields
What organisms belong to Class Amphibia?
caecilians, frogs, toads, salamanders
What characteristics made amphibians adaptable for land?
legs for crawling, lungs and nostrils for breathing air, tympana for detecting air-borne sounds
What is the skin of amphibians good for?
thin and highly vascularized
Why must amphibians remain close to water?
skin loses water, necessary for reproduction because eggs lack a shell and may become desiccated
What is pedomorphosis?
retention of larval traits in adult form (frogs and caecilians do not)
What organisms belong to Class Reptilia?
turtles, snakes, lizards, and crocodilians
What characteristics made reptiles able to be the first terrestrial vertebrates?
dry, scaly skin prevents water loss, lungs efficient enough for respiration, amniotic egg is watertight vessel that provides nutrients for embryo
