Photo By Judy Gallagher , used under CC-BY-2.0 /Cropped and compressed from original
Arrow-shaped micrathena
Micrathena sagittata
A species of Micrathena, Also known as Arrow-shaped orbweaver, Arrow-shaped micrathena spider
The arrow-shaped micrathena (Micrathena sagittata) has a distinct arrow-shaped backside that is mostly yellow, making them pretty easy to identify. They also have a large hole in the center of their web to assist them in turning. These spiders aren't particularly dangerous to humans, meaning you can observe without worry.
Toxic to Animals
Bite Humans
General Info About Arrow-shaped micrathena
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Attributes of Arrow-shaped micrathena
Biting/stinging
Not reported
Allergy-causing
Not reported
Defensive attack
Not reported
Venomous
The Arrow-shaped micrathena can induce toxic reactions varying in severity. Nevertheless, these toxins primarily target their prey and predators and are usually not fatal to humans.
Non-poisonous
Not reported
Borer
Not reported
Pollinator
Not reported
Pest-Eating Predatory
Not reported
Phytophagous
Not reported
Predatory
The Arrow-shaped micrathena typically preys on other arthropods and does not directly affect plants.
Biting animal or pet
Yes
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Appearance of Arrow-shaped micrathena
This is a striking spider with a distinctive arrow-shaped abdomen which is largely yellow, with black depressions above and variable red and black patterning below. Males are up to 5 mm in length (excluding legs), but females are much larger at around 9 mm. The males lack spines. They leave a hole in the center of their web to assist in motion.
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How Can You Attract Arrow-shaped micrathena
Not applicable as arrow-shaped micrathena primarily feeds on small insects which are ensnared in its web.
When is the Best Time to Observe Arrow-shaped micrathena
Daytime, particularly in the early morning or late afternoon when arrow-shaped micrathena may be repairing its web or more visible against the dew or backdrop sunlight.
What is the Best Weather to Observe Arrow-shaped micrathena
Warm, dry days are best, as rain can destroy arrow-shaped micrathena's web and reduce its visibility and activity.
How and Where Can You Find Arrow-shaped micrathena at Different Life Stages
Juvenile Arrow-shaped micrathena juveniles can be found in smaller, less intricate webs closer to the ground. Look for them in shrubs, tall grasses, or between structures where their web may span a gap. As arrow-shaped micrathena matures, their webs will grow in size and complexity, often found higher off the ground. Search around the edges of woodland clearings or amongst branches of small trees.
Adult Arrow-shaped micrathena adults create the largest, most visible webs, frequently found at eye level or above. Locate them by looking for the distinctive zigzag patterns or stabilimenta that arrow-shaped micrathena often incorporate into their webs, which are known to reflect UV light and can be more easily spotted.
Are Arrow-shaped micrathena harmful?
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Harmful Effects of Arrow-shaped micrathena
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Toxic to Animals
Bite Humans
Toxic to Animals
Arrow-shaped micrathena secretes a mild venom that generally causes minimal harm. This organism delivers its venom through bites, using specialized fangs to penetrate the skin of its targets. The effects can vary among different animals. For instance, humans and dogs may experience localized redness and swelling. Amphibians like frogs could show more vulnerability to the toxin, while insects face serious threats due to their smaller size and different physiology. Both juvenile and adult stages of arrow-shaped micrathena possess the ability to envenomate, ensuring their defense throughout their lifecycle.
Bite Humans
Arrow-shaped micrathena, typically avoids human contact and biting is atypical. If it occurs, it's defensive, related to an adult's response to perceived threats. Bites are mild with minimal effects. No specialized biting method is noted for interactions with humans.