prelim #2 - Prelim#2 Study Guide Deuterostome main opening...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Prelim #2 Study Guide Deuterostome: main opening becomes the anus Echinodermata: slow moving or sessile marine animals (sea stars, sand dollars, and sea urchins) that are usually radially symmetrical; have water vascular system and tube feet Chortdates: all have: 1) dorsal, hollow nerve cord 2 ) notochord : a flexible, supportive, longitudinal rod located between the digestive tract and the nerve cord 3 ) pharyngeal slits : located in pharynx, the region just behind the mouth 4) post anal tail * Lancelets : feed on suspended particles, wriggles into sand with head sticking out, have 4 chordate features 1. craniate: all chordates that have a head 2. Vertebrates: distinguished by a more extensive skull and a backbone (vertebral column), composed of a series of columns (vertebrae), type of chordate Chondrichthyes: sharks and rays, have a flexible skeleton made of cartilage, lateral line system that tests for vibrations in the water Ray Finned Fishes : include tuna, trout, goldfish; have a skeleton reinforced with a hard matrix of calcium phosphate; fins supported by thin, flexible skeleton rays Operculum : a protective flap that covers a chamber housing the gills, breathe without swimming Swim Bladder : lung derivative that helps keep them buoyant, a gas filled sac Lobe Fins : series of rod-shaped bones in their muscular pectoral and pelvic fins; coelacanth (deep sea dweller), lungfishes (stagnant waters and gulp air into lungs connected to the pharynx), third gave rise to terrestrial vertebrates Osteichthyes Lampreys: vertebrates that lack hinged jaws, use rasping tongue to penetrate skin 3. Tetrapoda: jawed vertebrates with limbs and feet that can support their weight on land Amphibia: salamanders, frogs, and caecilians; first tetrapods Amniota: tetrapods with terrestrially adapted egg, enhanced reproduction on land; have amniotic egg: major derived character of amniotes, inside of which the embryo develops within a protective, fluid filled sac called the amnion Mammalia: probably started as small, nocturnal insect eaters 1. Monotremata: egg laying mammals (platypus, echidnas, spiny anteaters) 2. placental mammal (eutheria): mammals that bear fully developed live young, placental mammals because they have more complex placentas 3. Marsupial: brief gestation, give birth to tiny, embryonic offspring that complete development while attached to the mother’s nipples (Aust, New Zealand, S. America) Reptilia: lizards, snakes, turtles, crocidilians ( crocodylia) , and birds ( ave s) Ectothermic : external heat rather than generating much of their own Canidae Carnivora- dogs, cats, bears, skunks, seals, sea lions, raccoons, 275 species Rodentia- squirrels, woodchucks, prarie dogs, porcupines, beavers, 2025 species Chiroptera- 1000 species, bats Primates- lemurs, monkeys, apes, tarsier, 235 species cell cycle : ordered sequence of events that extends from the time a cell is first formed from a dividing parent cell until its own division into two cells Interphase
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 6

prelim #2 - Prelim#2 Study Guide Deuterostome main opening...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online