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VS Who is Stronger? Modified from

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1 VS Who is Stronger? Modified from

2 The Bess Bug Odontotaenius disjunctus

3 Aliases Betsy Beetle Patent-leather Beetle Passalid Beetle

4 Phylum Arthropoda Class Insecta Order Coleoptera
Largest order of organisms, including over 350,000 species. One out of every four animals in this world is a beetle. They all have hard, shell-like forewings. A tough protector of the beetle's delicate hind wings and soft abdomen. Protects beetles as they squeeze through narrow passageways and burrow into decaying wood or sandy soil.

5 It’s Alive! “The bess bug is alive.” Defend this statement using the biological characteristics of living things ..\CharacteristicsofLivingThings_000.ppt

6 Where Does it Live? Commonly found in decaying logs from Texas to Florida and as far north as Canada. There are only two species in the U.S., while over 500 species can be found in the tropics.

7 Physical Characteristics
Large, shiny, black beetle 3 body parts - head, thorax, abdomen The thorax of this beetle has two sections, allowing its hard body to move more freely. 3 pairs of legs gold-colored fringe A pair of feathery antennae Small horn and long jaws protrude from the front of the head

8 Diet They prefer hardwood—oak, elm, and other deciduous trees—that is well decayed and falls apart easily. Wood is an indirect food source. Beetles don't have symbiotic bacteria in their gut that help them digest the cellulose in decaying wood. Bess beetles process wood in their digestive system, and then a fungus grows on the beetles' feces. It is this fungus that give beetles nourishment. Larvae eat a well-chewed mixture of beetle feces and wood.

9 Other Fun Facts They are social insects and raise young in adult pairs. Adults stridulate (shrill sound)by rubbing wings. Larvae stridulate by rubbing legs. Males have a prominent horn on their head. They have 2 pairs of wings but rarely fly.

10 Lab Purpose Observe and calculate the pulling power of a Bess Bug.
Determine the relative pulling strength of a Bess Bug compared to a human. Discuss how strength is an adaptive advantage for insects.

11 Strength? size (relative to their own body mass) muscle arrangement
* Brute Strength - How much can you lift/pull/push? * Relative Strength - How much can you lift/pull/push in comparison to your own body mass/weight? size (relative to their own body mass) muscle arrangement muscle attachment body structure flexibility

12 Procedure Highlights If the bugs are scared or feel threatened, they may not move. The harness should be placed between the thorax and abdomen. It should go down their back! The beetle should start on the cloth. The Petri dish should start on the table.

13 Procedure Highlights Any time the bug moves the dish, add a washer.
Move the bug and Petri dish back to its starting position if it gets off track. Do not pull or drag the bug. Pick it up! Handle the beetle gently and with respect!! Grasp it at the sides. Carefully remove the harness and return it to the container at the conclusion of the lab.

14 Measurements Mass of a washer or penny Mass of the Petri dish
Mass of the Petri dish with beetle Mass of the beetle Length, width, and height of the beetle

15 Calculations Total pulled of weights Beetle pulling power

16 Extra Credit Problem 2: Is a Bess Bug stronger than a human? (Hint – you will need to have a means of comparison)


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