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What kind of key cannot unlock a thing? Dichotomous Keys A dichotomous key is a tool that allows the user to determine the identity of items in the natural.

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Presentation on theme: "What kind of key cannot unlock a thing? Dichotomous Keys A dichotomous key is a tool that allows the user to determine the identity of items in the natural."— Presentation transcript:

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2 What kind of key cannot unlock a thing?

3 Dichotomous Keys A dichotomous key is a tool that allows the user to determine the identity of items in the natural world, such as trees, wildflowers, mammals, reptiles, rocks, and fish. "Dichotomous" means "divided into two parts". Therefore, dichotomous keys always give two choices in each step.

4 Example of a dichotomous key… Traditional format

5 Dichotomous key

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8 1a. With a holeGo to Question 2 1b. Without a holeGo to Question 3 2a. Six sidedIt is Species #1 2b. Four sidedIt is Species #6 3a. With threadingGo to Question 4 3b. Without threadingIt is Species #8 4a. Pointy tipGo to Question 5 4b. No pointy tipGo to Question 6 5a. Rounded headIt is Species #4 5b. Not rounded headIt is Species #7 6a. Flat headGo to Question 7 6b. Not flat headIt is Species #2 7a. Body length twice the width of head It is Species #5 7b. Body length not twice the width of head It is Species #3

9 Let’s Practice…….. Which bird is the Certhidea? Which bird is the Platyspiza? Which bird is the Geospiza? Which bird is the Camarhynchus? Guided Practice

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11 Let’s Practice….. What is fish letter g? a? GUIDEDPRACTICEGUIDEDPRACTICE

12 A. Beverlus B. Dallus C.Rajus D. Kentuckyus E. Californus F. Walawala G. DakotasH. Yorkius Cooperative Group Practice- Complete Norms ID in crews. Answers to Dichotomous Key on Norms REMEMBER- the objective is to work together to complete the task. Giving answers is to crew members is not acceptable. Help struggling crew members by showing them HOW to identify the Norm rather then by simply giveingthem the answer.

13 Dichotomous Key Independent Practice Identify the fish using a dichotomous key. Teacher needs to hand out the dry erase markers and white boards.

14 Now use the dichotomous key on your table to identify these fish  Anterior-front  Posterior-rear  Dorsal-top  Ventral-bottom  Elongated-stretched out  Concave-bowed in (like the mark in the grass if you drop a cannon ball)  Convex-bowed out  Barbels- whiskers  Caudal-tail Fish #1 Rock Bass (Redeye) Show Answers

15 Fish #2  Anterior-front  Posterior-rear  Dorsal-top  Ventral-bottom  Elongated-stretched out  Concave-bowed in (like the mark in the grass if you drop a cannon ball)  Convex-bowed out  Barbels- whiskers  Caudal-tail Brook Trout Show Answers

16  Anterior-front  Posterior-rear  Dorsal-top  Ventral-bottom  Elongated-stretched out  Concave-bowed in (like the mark in the grass if you drop a cannon ball)  Convex-bowed out  Barbels- whiskers  Caudal-tail Channel Catfish Show Answers

17 Concave forehead  Anterior-front  Posterior-rear  Dorsal-top  Ventral-bottom  Elongated-stretched out  Concave-bowed in (like the mark in the grass if you drop a cannon ball)  Convex-bowed out  Barbels- whiskers  Caudal-tail Yellow Perch Show Answers

18  Anterior-front  Posterior-rear  Dorsal-top  Ventral-bottom  Elongated-stretched out  Concave-bowed in (like the mark in the grass if you drop a cannon ball)  Convex-bowed out  Barbels- whiskers  Caudal-tail This is a Mad Tom catfish. They only grow a few inches in length. They are NOT on the key… Show Answers Fully grown 5 inch adult……..

19  Anterior-front  Posterior-rear  Dorsal-top  Ventral-bottom  Elongated-stretched out  Concave-bowed in (like the mark in the grass if you drop a cannon ball)  Convex-bowed out  Barbels- whiskers  Caudal-tail Bluegill Show Answers

20  Anterior-front  Posterior-rear  Dorsal-top  Ventral-bottom  Elongated-stretched out  Concave-bowed in (like the mark in the grass if you drop a cannon ball)  Convex-bowed out  Barbels- whiskers  Caudal-tail Bullhead Catfish Show Answers Slightly Indented Caudal.

21  Anterior-front  Posterior-rear  Dorsal-top  Ventral-bottom  Elongated-stretched out  Concave-bowed in (like the mark in the grass if you drop a cannon ball)  Convex-bowed out  Barbels- whiskers  Caudal-tail Chain Pickerel Show Answers

22  Anterior-front  Posterior-rear  Dorsal-top  Ventral-bottom  Elongated-stretched out  Concave-bowed in (like the mark in the grass if you drop a cannon ball)  Convex-bowed out  Barbels- whiskers  Caudal-tail American Eel Show Answers

23  Anterior-front  Posterior-rear  Dorsal-top  Ventral-bottom  Elongated-stretched out  Concave-bowed in (like the mark in the grass if you drop a cannon ball)  Convex-bowed out  Barbels- whiskers  Caudal-tail This is a Redbreast. It is NOT on the key ;) Show Answers

24  Anterior-front  Posterior-rear  Dorsal-top  Ventral-bottom  Elongated-stretched out  Concave-bowed in (like the mark in the grass if you drop a cannon ball)  Convex-bowed out  Barbels- whiskers  Caudal-tail Largemouth Bass Show Answers

25  Anterior-front  Posterior-rear  Dorsal-top  Ventral-bottom  Elongated-stretched out  Concave-bowed in (like the mark in the grass if you drop a cannon ball)  Convex-bowed out  Barbels- whiskers  Caudal-tail Northern Pike Show Answers

26  Anterior-front  Posterior-rear  Dorsal-top  Ventral-bottom  Elongated-stretched out  Concave-bowed in (like the mark in the grass if you drop a cannon ball)  Convex-bowed out  Barbels- whiskers  Caudal-tail Rainbow Trout Show Answers

27  Anterior-front  Posterior-rear  Dorsal-top  Ventral-bottom  Elongated-stretched out  Concave-bowed in (like the mark in the grass if you drop a cannon ball)  Convex-bowed out  Barbels- whiskers  Caudal-tail White Suckah…Sucker… Show Answers

28  Anterior-front  Posterior-rear  Dorsal-top  Ventral-bottom  Elongated-stretched out  Concave-bowed in (like the mark in the grass if you drop a cannon ball)  Convex-bowed out  Barbels- whiskers  Caudal-tail This is a Black Crappie (pronounce “Crop’- ee”) and it isn’t on the key… Show Answers

29  Anterior-front  Posterior-rear  Dorsal-top  Ventral-bottom  Elongated-stretched out  Concave-bowed in (like the mark in the grass if you drop a cannon ball)  Convex-bowed out  Barbels- whiskers  Caudal-tail Carp Show Answers

30  Anterior-front  Posterior-rear  Dorsal-top  Ventral-bottom  Elongated-stretched out  Concave-bowed in (like the mark in the grass if you drop a cannon ball)  Convex-bowed out  Barbels- whiskers  Caudal-tail Smallmouth Bass Show Answers

31  Anterior-front  Posterior-rear  Dorsal-top  Ventral-bottom  Elongated-stretched out  Concave-bowed in (like the mark in the grass if you drop a cannon ball)  Convex-bowed out  Barbels- whiskers  Caudal-tail Walleye Show Answers

32  Anterior-front  Posterior-rear  Dorsal-top  Ventral-bottom  Elongated-stretched out  Concave-bowed in (like the mark in the grass if you drop a cannon ball)  Convex-bowed out  Barbels- whiskers  Caudal-tail White Crappie Show Answers

33  Anterior-front  Posterior-rear  Dorsal-top  Ventral-bottom  Elongated-stretched out  Concave-bowed in (like the mark in the grass if you drop a cannon ball)  Convex-bowed out  Barbels- whiskers  Caudal-tail This is a Bowfin or “Mudfish,” and it isn’t on the key… Show Answers

34  Anterior-front  Posterior-rear  Dorsal-top  Ventral-bottom  Elongated-stretched out  Concave-bowed in (like the mark in the grass if you drop a cannon ball)  Convex-bowed out  Barbels- whiskers  Caudal-tail This is a Blue Catfish… Show Answers

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36 Opening/Closing- Using your Pamishan Dichotomous Key homework sheet, identify this Pamishan. Narrowus wolfus Walk-thru example…

37 1.What tool is used to help identify and classify organisms? A dichotomous key. 2. How many options are there for each number in this tool? two 3. Use the Pamishan dichtomous key to determine which Pamishan is shown here. This is number 10, Broadus emmus. Opening/Closing

38 Pamishan Creatures Activity One Independent Practice (OPTIONAL) -Each of you will be assigned a number for a Pamishan Alien and a dichotomous key (do NOT write on either one.) Use the dichotomous key to identify your Pamishan Alien.

39 Pamishan Creatures Activity Two Independent Practice Identify the Pamishan Aliens. OWs will use Crew Drill Tally sheet to record incorrect responses for each crew member (#1-10 only.) Boatswain will ensure answers are reported accurately.

40 Pamishan Alien Dichotomous Key answers 1.Narrowus portus 2.Broadus archus 3.Narrowus plainus 4.Broadus hairyemus 5.Broadus hairus 6.Broadus anderscus 7.Narrowus montanus 8.Narrowus georgius 9.Narrowus blankus 10.Broadus emmus 11. Narrowus cyclops 12. Broadus hairystus 13. Narrowus beardus 14. Broadus walter 15. Broadus plainus 16. Broadus kiferus 17. Narrowus starbops 18. Broadus tritops 19. Narrowus wolfus 20. Narrowus fuzzus

41 Salamanders: Use your handout to identify these salamanders Independent PRACTICE Over 7 cm. Siren Spotted Salamander Mudpuppy Marbled Salamander Tiger Salamander Red-backed Salamander

42 1.A __________________ is a tool used to help identify and classify organisms. 2. What is this organism? This is number 1, Narrowus portus. Opening/Closing dichotomous key 3. What is this organism? This is a two-lined Salamander. Use the Pamishan key in the vinyl sleeve. Use the salamanders key. No external gills Hind legs Key will say spikes on left leg. That is YOUR left as you are looking at it. Less than 7 cm.

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44 Find Arachnid Dichotomous Key

45 Microwhip Scorpion A

46 Daddy Long Legs Segmented abdomen No tail Abdomen much larger than cephalothorax Pedipalps much shorter than legs B

47 Scorpion C

48 Wind Scorpion Segmented abdomen. Abdomen larger than cephalothorax. Pedipalps about the same size as legs. No pincers on pedipalps Pedipalps D

49 Mite -no segmented cephalothorax or abdomen. -Spines Size of a pencil point - Cephalothorax and abdomen join here E

50 Whip spiders F -Segmented abdomen -No tail -First leg

51 Tick G -no segmented abdomen or ceph. -no narrowing where abdomen and cephalothorax meet.

52 Sea Spider H -segmented cephalothorax -abdomen much smaller than cephalothorax

53 Argiope I Cephalothorax Abdomen (narrowing at waist) tiny pedipalps Abdomen NOT segmented Some hair on cephalothroax but not on abdomen

54 Jumping Spider J - NO segmented abdomen or cephalothorax -narrow “waist.” -pedipalps slightly shorter than legs Curved pedipalps

55 Tarantula K -Pedipalps straight No segmented abdomen or ceph. -Narrow waist

56 Whip Scorpion -no stinger on tip of tail. -large pincers pedipalps L

57 Trapdoor Spider Plated cephalothorax Thick, tight jaws pedipalps M

58 Pseudoscorpion pedipalps

59 Abdomen has more than 6 segments Abdomen does not “split” or fork and does not have any kind of tail. Using the Insect Dichtomous Key to identify the order of this insect. Order Phasmatodea- Walking Stick

60 Eyes located on sides of head Order Thysanura- Silverfish. Using the Insect Dichtomous Key to identify the order of this insect.

61 Use the Dichotomous Key for Stream Animals to Identify Mayfly Larva Single hook on end of each appendage (leg) Tails are “thin.”

62 Use the Dichotomous Key for Stream Animals to Identify Hellgrammite

63 Use the Dichotomous Key for Stream Animals to Identify Damselfly Nymph Tails are “wide.”

64 Use the Dichotomous Key for Stream Animals to Identify Emerging from sand tube. Caddisfly Larvae

65 Use the Dichotomous Key for Stream Animals to Identify Cranefly Larvae

66 Use the Dichotomous Key for Stream Animals to Identify Dragonfly Nymph Three short points, but no tails.

67 Use Seaworld Key

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69 Use Cedar Glade Flowers Key A “daisy-like” flower would be similar to this. Multiple, long, slender petals.


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