who is stronger? vs. the bess bug odontotaenius disjunctus
TRANSCRIPT
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Who is Stronger?
VS
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The Bess Bug Odontotaenius disjunctus
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Aliases
• Betsy Beetle
• Patent-leather Beetle
• Passalid Beetle
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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.
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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.
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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
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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.
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Other Fun Facts• They are social insects and raise young in adult
pairs.• Adults stridulate 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.
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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.
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* 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?
Strength?
• size (relative to their own body mass)
• muscle arrangement
• muscle attachment
• body structure
• flexibility
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• 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.
Procedure Highlights
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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.
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Measurements
• Mass of a washer
• Mass of the Petri dish
• Mass of the Petri dish with beetle
• Mass of the beetle
• Length, width, and height of the beetle
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Calculations
• Total pulled washer weight
• Beetle pulling
power
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