Quiz 3 Flashcards
What characteristics of Petromyzonida differentiate them from other fish groups
They lack jaws, internal ossification, paired fins, and scales
What are petromyzondia
Lamprey, a parasitic fish
What organism from echnioderms or chordates do lamprey larva resemble
Lamprey larva AKA ammocoete larva resemble amphioxus. Unlike amphioxus, ammocoets have a 2 chambered heart, 3-part brains, and thyroid and pititutary glands
How do lampreys differ from their larval stage vs adult stage? What changes do they undergo when they metemorphosize?
body becomes rounder and shorter, pharynx is divided longitudionally, eyes enlarge, and notrils shift to the top of the head; Goes from filter feeder to parasitic
How can you differentiate a male/female shark
Claspers by pelvic fin indicate a male
What is the function of a spiracle in a shark
allows water to flow to the gills when the shark is feeding or otherwise has its mouth closed
What is the function of the ampullaw of lorenzini
Electroreceptors; sense organs able to detect electric fields
What structure do sharks have that allow them to maintain buoyancy
Large liver produces oil and the arraingment of the caudal and pectoral fins also work together to control dpeth when swimming
What is the function of the spiral valve
Slows down the passage of food through the ilium allowing better digestion as well as more SA to V ratio
what paired fin does the perch have that the shark doesn’t
sharks do not have anal fins
What type of scales do perch have and how do you know
Perch have Ctenoid scales named for the comb-like edges of the scale
Name two characteristics of Actinopterygii that are not found in Chorndrichthyes
Presence of ctenoid scales, anal fins,
Name one animal expample of Sarcopterygii what about their fins give rise to furture tetrapods
Lobe-finned; gave rise to digits in fins that allow for muscle attachment and to “push up” and out fo the water
What is a brittle stars defense mechanism when encountering a predator
breaking off a leg
What are sea urchin spines used for
holding onto surfaces, locomotion, and defense
