BIOL 152 1st Edition Lecture 24 Outline of Last Lecture I. Animal DiversityII. SpongesIII. CnidariansIV. NematocystsV. CtenophoresVI. Lophotrochozoansa. Annelidsb. MollusksVII. GastrapodaVIII. CephalopodsIX. Phylum ArthropodaOutline of Current Lecture I. InsectsII. DeuterostomesIII. Chordataa. Vertebrate characteristicsCurrent LectureInsects- Why are they so diverse and successful?- Modular body, small body sizeo More niches, “cheap” circulation/respiration- Short generation time- Wings escape dispersal, Resource use- Metamorphosis (44.22)o Incomplete grasshopppers The young resemble the adultso Complete butterflies Larvae in different niche, benefits use temporary resources, stages don’t compete)DeuterostomesThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Hemichordates (44.24) 10 species- Enchinoderms:o Pentaradial symmetry (44.25/6)o All marine, sedentary or sessile lifestyleo Larvae are bilaterally symmetricalo Water vascular system (locomotion, prey capture)o Organs, complete digestive tract, external fertilization5 MAJOR GROUPS/ 1 MINORMajor:1. Asteriods- sea stars2. Ohpinoids- brittle stars3. Echinoids- sea urchins4. Holothuroids- sea cucumbers5. Crinoids- sea liliesMinor:1. Concentricycloids- sea daisies a. Massively impact ecosystem Chordata(44.23)All chordates: - Notochord- Dorsal, hollow nerve cord- Pharyngeal slits- Muscular, post-anal tail (Some species only possess these traits at the embryonic stage)Vertebrate characteristics:- Developed brain/ eyes- Cranium, jaw- Pharyngeal slits (gills)- Paired fins- VertebrateCephalochordate (44.26) UrochordataVertebrataEx. Hagfish/ lampreys= jawlessChondrichtynytes= sharksOsteichthytes= bony fishesAmphibiansAmniotesMammals - Milk, mammory gland- Hair (keratin)- Differentiated teeth- 3 groupso Monotremes platypus o Marsupials kangarooso Eutheria (placentral mammals) Largest group of mammals, most
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