I am studying Amniota and I was wondering if someone could explain to me the following concepts. I know that the features of Chordata are the notochord, dorsal nerve cords, gill clefts (except for Tunicata); segmented muscles and a post-anal tail. I know that developmentally we are related to echinoderms. Can you explain the relationship between the Cordata and Echinodermata? Using the bird, reptile and mammal (or those that came from an aminotic egg) as an example can you explain the following:
a) Why these 3 (bird, reptile and mammal) are grouped together?
b) What advantages (from an evolution perspective) do these three (as representatives of chordata) have over echinoderms?
c) How the above advantages suit a certain environment or habitat?
Also can you some websites that might be helpful in understanding this concept.© BrainMass Inc. brainmass.com October 24, 2018, 9:22 pm ad1c9bdddf
You have all the important features of chordates listed. The key one is that they have a notochord at some point in their development. Another feature is that they have a bilateral body plan. This means that they have a left and right side that are not identical. Echinodermata consist of star fish, sea urchines etc. The main difference is that echinoderms have radial symmetry (specifically pentaradial meaning 5 sides) that are identical. Echinoderms like chordates are deuterostomes (anus forms first; http://tolweb.org/Deuterostomia/2466). They ...
Examination with web references of the differences between the different groups of amniotes and the advantages they have over echinoderms. cavities.
The platypus and the spiny anteater are examples of which mammalian group?
Almost all invertebrate chordates are
c. filter feeders
Which of the following is not a characteristic chordate feature?
a. a pharynx
b. a notochord
c. a nerve cord
d. a pseudocoelom
Which of the following is not a subphyla of the phylum Chordata?
The duck-billed platypus
a. passes gametes, feces, and urine through the same duct
b. gives birth to live young
c. is found in Africa and Australia
d. is active primarily during the day
a. include the sharks and rays
b. were the earliest jawless fishes
c. became extinct during the Carboniferous period
d. gave rise to the amphibians
The invasion of the Great Lakes by ______ has decimated the lakes' trout populations.
The only living lobe-finned fish is the
The amphibians arose from ______ during the ______.
a. placoderms; Cambrian
b. lungfishes; Jurassic
c. lobe-finned fishes; Devonian
d. hagfishes; Silurian
a. have external fertilization
b. produce amniote eggs
c. gave rise to the amphibians
d. are the most diverse vertebrate group
a. have a cloaca
b. lay amniote eggs
c. have feathers
d. have a four-chambered heart
Which of the following is not a mammalian lineage?
a. the monotremes
b. the synapsids
c. the marsupials
d. the therians
Mammals did not arise until after the extinction of the dinosaurs.
The most species-rich vertebrate group are the
The vertebrate jaw first appeared in
Lungs evolved as outpouchings of the :
a. swim bladder
d. blood vessels
The caecilians are a small group of
The ______ can use their skin as a respiratory surface.
Reptiles resemble _____ in ______.
a. fish; not being able to leave the water
b. ostracoderms; lacking jaws
c. amphibians; relying on water for reproduction
d. birds; producing amniote eggs
The first vertebrates with a four-chambered heart fully separated into two halves were the
The ______ gave rise to the mammals.