An elongate midline mark on the anterior, dorsal surface of the abdomen which overlies the heart
The grey stripe on the back of a spider is called the cardiac mark, and it is significant because it indicates the location of the spider's heart. This mark helps researchers and scientists identify different species of spiders based on their unique cardiac marks.
No, but you will get a bite mark and some swelling.
A spider with a brown oval mark on its back could potentially be a brown widow spider. Brown widows are related to black widows but have characteristic brown markings on their abdomens. It's always best to consult with an expert or use caution when identifying spiders to avoid potential harm.
some are maybe
nothing
Spiders click as a way to communicate and to mark territory
It sounds like you may have found a black widow spider. Black widows are known for their shiny black bodies with a red hourglass mark on their underside. Their fangs are typically a shiny green color. Be cautious around them, as their bite can be venomous.
A black widow spider is black with a red mark on it's abdomen; this might or might not be what you meant. The black widow sometimes has a red mark on her back, as well. The red backed spider of Australia, a relative of the black widow, has an orange red mark on the back.
The ant mimic spider is a type of Jumping Spider. Jumping Spiders are harmless. The most you would get is a small red mark where the bite occurred.
Mark E. Josephson has written: 'Clinical cardiac electrophysiology' -- subject(s): Arrhythmia, Cardiac Arrhythmias, Cardiac Electrophysiologic Techniques, Diagnosis, Diseases, Electrocardiography, Electrophysiology, Heart, Heart Diseases, Heart conduction system, Methods, Physiology, Physiopathology, Therapy 'Clinical cardiac electrophysiology ; techniques and interpretations' -- subject(s): Arrhythmia, Diagnosis, Diseases, Electrocardiography, Electrophysiology, Heart, Heart Diseases, Physiology, Physiopathology
If the red mark is in the shape of an hourglass, and on the underside of the abdomen (not on the top), it might be a Brown Widow Spider. However, Brown Widows only live in certain areas, so it really depends on where you live.
If the red swollen mark at the back of your hand seems like a raised red welt and there is a spot on the middle and feels so itchy and painful, then probably it is a spider bite.