Animal Diversity Biology 1114 Robin Taylor
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This 2 page Class Notes was uploaded by an elite notetaker on Thursday October 1, 2015. The Class Notes belongs to Biology 1114 Robin Taylor at Ohio State University taught by Dr. Robin Taylor in Fall 2015. Since its upload, it has received 75 views. For similar materials see Biology for the Life Sciences in Biology at Ohio State University.
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Date Created: 10/01/15
REMINDER Arthropods most speciose CHORDATES phylum chordata segmented 1 notochords stiffened by hydrostatic pressure segmented body muscles bend the notochord and body and allow the ability to move side to side undulatory motion 2 Subgroup are vertebrates gnathostomes manifest feet and are tetrapods that lay eggs suited for land are amniotes that manifest hair and milk mammals fishgt swim bladder lungs more highly derived version of lungs transitional zones went back to seacoopted lungs swim bladder Ex coelacanths lung fish tetrapods four footed animals humans included lung fish has lungs lives in transitional one Early amphibians Devonian period transitional fossils water to land Tiktaalik roseae quotfishapodquotPredators of insects Amphibian reproduction eggs require moist environment eggs have no shells and are carried on the back of the mouth or in the stomach Ex frothy west females retain eggs internally Amniotes developed eggs with shells humans are amniotes but mammals have lost the shells and retained the eggs internally 3 extant lineages of mammals Amnio clade fit dry environments all reptiles and mammals names for eggs that is now in a shell all tetrapods except amphibians REMINDER insects colonized land before tetrapods Derived aspects of amnids eggs with shell dry skin well developed ribs surrounding the lungs internal fertilization faster more agile movement a avian reptiles lay eggs Ex archaeopteryx METATHERIANS 1 Monotremes lay eggs 2 Marsupialsin a pouch EUTHERIANS Eutherians bear well developed live young Duck bill platypus American39s one marsupial is the opossum Australia39s version is possum Caution the big picture can make everything seem adaptive ex feeding specializations Whales baleen teeth keep mouths open Adaptations npl specialized features that enhance fitness Adaptation v is the process by which features that enhance fitness are fixed in a population or species Traits can be accidental or anachronistic out of time Pleiotropy traits that tag along with other traits Ex distribution of human blood types in Europe