Ch. 34 Animals: Deuterosomes by me

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Ch. 34 Animals: Deuterosomes by me by Mind Map: Ch. 34 Animals: Deuterosomes by me

1. Chondrichthyes

1.1. Ex: sharks, rays, skates

1.2. Subclass has some species of ratfish and chimaeras

1.3. Skeleton primarily made of cartilage

1.4. Some suspension feeders, but mostly carnivores

1.5. Have short digestive tract with ridge called spiral valve to increase digestive surface area

1.6. Has acute senses of smell, sight, and can detect electrical fields

1.7. Eggs fertilized internally, but can develop in 3 different ways

1.7.1. Oviparous: eggs hatch outside mother's body

1.7.2. Ovoviviparous: embryo develops within uterus nourished by egg yolk

1.7.3. Viviparous: embryo develops within uterus nourished by yolk sac placenta from mother's blood

1.8. Reproductive tract, excretory system, and digestive trace empty into cloaca

2. Enchinodermata

2.1. Ex: starfish

2.2. Slow-moving or sessile

2.3. Thin epidermis covers hard calcareous plates

2.4. Has unique water vascular system

2.4.1. Network of hydraulic canals branching into tube feet functioning in locomotion and feeding

2.5. Sexual reproduction is external

2.6. Most have radial symmetry in multiples of 5 (penta-symmetry)

2.7. Larva have bilateral symmetry

2.8. Divided into five clades:

2.8.1. Asteroidea: sea stars & sea daisies Sea stars: Multiple arms radiate from central disk Arms grip with tube feet that have adhesive chemicals Eat bivalves by prying them open with tube feet and digesting them externally Can regrow lost arms Sea daisies Armless Only 3 know species Live on submerged wood absorbing nutrients through membrane surrounding body

2.8.2. Ophiuroidea: brittle stars Distinct central disk Long, flexible arms Some are suspension feeders, others are predators or scavengers

2.8.3. Echinoidea: sea urchins & sand dollars No arms but 5 rows of rube feet Spines used for locomotion and protection Sea urchins eat seaweed using "jaws" on underside

2.8.4. Crinoidea: sea lilies & feather stars Sea lilies: Live attached to substrate by stalk Feather stars: Crawl using long, flexible arms Both are suspension feeders Changed little through evolution

2.8.5. Holothuroidea: sea cucumbers Lack spines Reduced endoskeleton Dissimilar looks to other enchinoderms 5 rows of tube feet, some used as feeding tentacles

3. Chordates

3.1. All have notochord and dorsal, hollow nerve cord, pharyngeal slits or clefts, and post-anal tail

3.1.1. Notochord: longitudinal, flexible rod between digestive tube and nerve cord. Provides skeletal support

3.1.2. Dorsal nerve cord: develops into brain and spinal cord

3.1.3. Pharyngeal clefts: develop into slits opening outside of body. Suspension-feeding structures in invertebrates, gas exchange in vertebrates (except tetrapods, they develop parts of ear, head, and neck)

3.1.4. Post-anal tail: Often reduced during embryonic development

3.1.5. Contains skeletal elements and muscles

3.1.6. Provides propelling force in many aquatic species

3.2. Some lose these traits past embryonic development

3.3. This phylum contains two basal groups of invertebrates as well as below categories

3.4. Are bilaterally symmetrical coelomates

3.5. Segmented bodies

3.6. Genes associated with heart and thyroid are common to all chordates

3.7. Genes associated with transmission of nerve impulses are unique to vertebrates

4. Vertebrates

4.1. Chordates that have a backbone

4.2. Skeletal system and complex nervous system allow vertebrates to be better at capturing food and evading predators

4.3. Have 2+ sets of Hox genes (lancelets/tunicates have only 1)

4.4. Have vertebrae enclosing a spinal cord, an elaborate skull, and fin rays (in aquatic forms)

5. Reptilia

5.1. Ex: tuataras, lizards, snakes, turtles, crocodilians, and birds

5.2. Have scales to make waterproof barrier

5.3. Most ectothermic: internal termperature mostly regulated via external sources

5.4. Birds are endothermic: capable of independant internal termperature regulation

5.5. Turtles:

5.5.1. All have boxlike shell of upper and lower shields fused to vertebrae, clavicles, and ribs

5.6. Diapsids:

5.6.1. Archosaurs: Crocodilians: belong to lineage dating back to late triassic Birds: nearly every part of body adapted for flight: wings with keratin feathers, lack of urinary bladder, females have 1 ovary, small gonads, and no teeth Belong to clade neornithes Several groups of birds are flightless:

5.6.2. Lepidosaurs: Tuataras: one surviving species: lizard-like reptiles called tuataras, along with one surviving lineage Squamates: major living lineage which includes lizards and snakes Snakes: have chemical sensors, heat-detecting organs, venom, loosely articulated jawbones, and elastic skin Lizards:

6. Mammalia

6.1. Amniotes that have: mammary glnds tht produce milk, hair, high metabolic rate due to endothermy, larger proportional brain size to other vertebrates, differentiated teeth

6.2. Are synapsids

6.3. By early cretaceous, 3 living lineages appeared

6.3.1. Monotremes: Ex: echidnas, platypus Egg laying mammals

6.3.2. Marsupials: Ex: opossums, kangaroos, koalas Embryo develops within placenta in mother's uterus Completes development while nursing in maternal pouch called marsupium

6.3.3. Eutherians: Have more complex planceta than marsupials Completes development within uterus, joined to mother by placenta

6.4. Primates:

6.4.1. Ex: lemurs, tarsiers, monkeys, apes, humans

6.4.2. Traits: large brain, short jaws, hands/feet adapted to grasping, short nails, complex social behavior and parental care, forward-facing eyes close together on face, and fully opposable thumb

6.4.3. Three main groups: Lemurs, lorises, and bush babies Tarsiers Anthropoids (monkeys and apes) New world monkeys Old world monkeys Apes: diverged rom old world monkeys about 25-30 mya

7. Tetrapods

7.1. Adaptations include 4 limbs, feet with toes, neck (for separate head movement), fusion of pelvic girdle to backbone, absence of gills, and ears

7.2. Tiktaalik, nicknamed fishapod, was a fish/tetrapod hybrid

7.3. First tetrapods appeared 365 million years ago

8. Actinastia

8.1. Ex: coelacanth

9. Actinopterygii (ray fins)

9.1. Ex: yellowfin tuna

9.2. Fins modifed for maneuvering, defense, and other stuff

10. Gnathostomes

10.1. Vertebrates with jaws

10.2. Have hinged jaw used to grip food firmly

10.3. Jaws hypothesized to have developed from skeletal rods supporting gill slits

10.4. Have genome duplication (inlcuding Hox gene duplication), enlarged forebrain giving better smell and vision, and lateral line system (detects vibrations)

11. Ostelchthyans

11.1. Nearly all have bony endoskeleton

11.2. Aquatic osteicthyans are what we call fish

11.3. Have lateral line system

11.4. Most oviparous, some have internal fertilization and birthing

11.5. Breathe by drawing water over gills protected by operculum

11.6. Control buoyancy with air sac called swim bladder

12. Lobe-fins

12.1. Muscular pelvic and pectoral fins used to swim and "walk"

12.2. Three lineages survive: coelacanths, lungfishes, and tetrapods

13. Amniotes

13.1. Amniotic egg was key adaptation to life on land

13.2. Most amniotic eggs have shells

13.3. Other adaptations include impermeable skin and rib cage ventilates lungs

14. Cyclostomes

14.1. Myxini (hagfish)

14.1.1. Have cartilaginous skull

14.1.2. Have reduced vertebrae

14.1.3. Have flexible rod of cartilage derived from notochord

14.1.4. Have small brain, eyes, ears, and "teeth"

14.1.5. Marine, most are bottom-dwelling scavengers

14.2. Petromydontida (lampreys)

14.2.1. Parasites that eat by clamping mouth to live fish

14.2.2. Inhabit marine and freshwater spots

14.2.3. Have cartilaginous segments surrounding notochord

14.3. Lack backbone, but have rudimentary vertebrae

14.4. Only 2 remaining lineages of jawless vertebrates

15. Dipnoi

15.1. Ex: lungfish

15.2. Gills main organs for gas exchange, but also surface to gulp air

15.3. 1/3 surviving lobe-fins are tetrapods, a group that adapted to land

16. Amphibia

16.1. Contains 3 clades:

16.1.1. Urodela: salamanders Amphibians with tails Paedomorphosis is common in aquatic species Paedomorphosis: retention of juvenile features in sexually mature organisms

16.1.2. Anura: frogs Powerful hinds legs Frogs with leathery skin are called toads

16.1.3. Apoda: caecilians Legless, nearly blind, and resemble earthworms

16.1.4. Amphibian means "both ways of life"

16.1.5. Most have moist skin to help lungs with gas exchange

16.1.6. Fertilization external in most species, and eggs require moist environment

16.1.7. Some have males or females carry eggs on back, in mouth, or in stomach

17. Cephalochordata

17.1. Ex: lancelets

17.1.1. Named for bladelike shape

17.1.2. Marine suspension feeders

17.1.3. Retain characteristics of chordate body plan as adults

18. Urochordata

18.1. Ex: tunicates

18.1.1. Resemble chordates during larval stage

18.1.2. Draw in water through incurrent siphon, filtering food particles

18.1.3. Highly derived & have less Hox genes than other vertebrates

19. Deuterosome characteristics:

19.1. Radial cleavage

19.2. Formation of anus from blastopore

19.3. Defined primarily be DNA similarities