A "Black Widow" has a red hourglass shape on the underside of its abdomen, but it isn't impossible to spot a spider with the infamous red mark on its upper abdomen, that would make it a "Red-Back Widow," which is found only in Australia (unless something has gone horribly wrong!)
If you don't live in Australia, it is most likely a "Northern Black Widow" which has several variations in the location and size of the red mark, usually small spots or the hourglass shape.
If neither of these is the spider you're asking about, consider the hairy jumping spider, "Whitmani" The female is black or dark gray with a bright red abdomen
um..hmm..are you thinking of a black wido i hate those things
A green spider with a red spot is dangerous if it is a red back. Normally, green spiders are not dangerous.
The male green jumping spider has a dark red head and a bright green body. The scientific name for this spider is Mopsus Mormon.
# i don,t know i just fond a red spider with a black butt and black tips on feet and black fangs let me know if you find out
THE ONE WITH MIXED PARENTS
The Smiley Face Spider has a heart like shape on the butt.
A black spider with a red mark and green fangs might be a black widow spider. This spider is very venomous and its bite can kill a human if treatment is not received soon after a bite.
If its black, has a large butt and there's a red shape on its back the resembles an hourglass, then its a black widow spider and they are very poisonous
It is the most deadlyest spider apart from the red back...it is its cousin...the crizone spider
From the description, this sounds like an Arrowshaped Micrathena spider. It's a variety of the orb weaver and is known for its bright colors and spikes.
I have no idea im truly sorry....
a redback spider