Pseudoscorpion and beetle symbiotic relationship worksheet

Hitchin’ A Ride | Beetles In The Bush

pseudoscorpion and beetle symbiotic relationship worksheet

Pseudoscorpions often carry out phoresy, a form of commensalism in which be found feeding on mites under the wing covers of certain beetles. Pennsylvania State University, Department: Entomological Notes: Pseudoscorpion Fact Sheet. determine the type of symbiotic relationship the organisms share. Symbiosis is a close, permanent ecological relationship between organisms of two different Worksheet A few species of pseudoscorpions disperse by concealing themselves under the wing covers (elyatra) of large beetles such as the cerambycid beetle. Pseudo Scorpion catching a ride on the beetle Commensalism- A relationship in which one species benefits and the other is neither helped.

A venom gland and duct are usually located in the mobile finger; the venom is used to capture and immobilize the pseudoscorpion's prey.

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During digestion, pseudoscorpions pour a mildly corrosive fluid over the prey, then ingest the liquefied remains. A coloured etching of a pseudoscorpion Pseudoscorpions spin silk from a gland in their jaws to make disk-shaped cocoons for mating, molting, or waiting out cold weather. However, they do not have book lungs like true scorpions and the Tetrapulmonata.

Instead they breathe exclusively through spiracles. Behavior Phoretic pseudoscorpion on a fly, Germany Some species have an elaborate mating dancewhere the male pulls a female over a spermatophore previously laid upon a surface. The young go through three molts over the course of several years before reaching adulthood.

Many species molt in a small, silken igloo that protects them from enemies during this vulnerable period. They are active in the warm months of the year, overwintering in silken cocoons when the weather grows cold.


Smaller species live in debris and humus. Most spiders were completely non-confrontational, simply moving away, and only rarely flicking silk.

When the threat level escalated to persistent prodding, the spiders changed their defensive behaviour: Silk-flicking is much safer than biting for a black widow — she can maintain her distance while flinging sticky silk to subdue or slow down her attacker. Biting, on the other hand, requires getting up close and personal with the assailant in order to pierce it with her tiny fangs, making her much more vulnerable to injury.

Examples of Commensalism for a Better Understanding of the Concept

Pinching also resulted in silk-flicking by about half of the spiders, and a few played dead. The next question the researchers wanted to answer was, do the spiders control whether and how much venom they inject when biting?

In particular, they wanted to know if the amount of venom injected would vary depending on the type of threat in this case either pinching a leg with forceps, or grasping the abdomen with gloved fingers. For this experiment they came up with a clever method to collect the venom: If a spider did bite, her fangs would pierce the membrane the number of holes would indicate how many times and any venom she expelled would be collected in the vial so the volume could subsequently be measured.

It turned out that more than half of all bites were dry no venom was detected in the vials. The black widows delivered more bites per target when they were pinched on a leg than on the abdomen, but more venom was released with each bite when the abdomen was pinched. Being grasped by the body is a high-risk situation for a black widow because her abdomen is unarmored and vulnerable; a strong squeeze or puncture can be deadly. Pinching a single leg, on the other hand, represents a non-life threatening attack.

Spiders can autotomize drop their limbs and survive without significant ill effects. The contrasting ultraviolet pattern called a nectar guide helps a bee quickly locate the flower's center. This adaptation benefits both the flower more efficient pollination and the bee rapid collection of nectar. This neither harms nor benefits the whales. The moths lay their eggs in the flowers where the larvae hatch and eat some of the developing seeds.

pseudoscorpion and beetle symbiotic relationship worksheet

This neither harms nor benefits the snails. The badgers then expose the hives and feed on the honey first. Then the honey guide birds eat. This adaptation allows the orchid to receive enough sunlight to perform its photosynthesis but the kapok tree is unaffected.

pseudoscorpion and beetle symbiotic relationship worksheet

The fungi hold the water supply and the algae perform photosynthesis and manufacture the carbohydrates for both. A species of ant eat secretions of the acacia, drink its sap, and raise its young in the hollow thorns.

The ants also keep competing vines from growing near the acacia tree and they help repel any insects that would damage the acacia tree.