11. The most prevalent species occurring in Australia is commonly called the redback ( " Latrodectus hasselti " ). 12. This was not rectified until 1933 when it was correctly identified as the male " Latrodectus katipo ". 13. In " Latrodectus hasselti ", larger males outcompete smaller males by getting to the females web first. 14. Fatal bites were reported in the early 20th century mostly with " Latrodectus tredecimguttatus ", the Mediterranean black widow. 15. The clinical features of latrodectism are similar for all species of " Latrodectus " spiders and is generally characterised by extreme pain. 16. The family includes some model organisms for research, for example, the genus " Latrodectus ", the medically important widow spiders. 17. The genera " Steatoda " and " Latrodectus " are biologically close relatives; both belonging to the same family Theridiidae. 18. "Latrodectus hesperus " frequently hangs upside down near center of the web and waits for any insects to enter the web to attack. 19. ""'Latrodectus rhodesiensis " "'is a species of spider in the family Theridiidae, found in southern Africa. 20. Not all " Steatoda " species resemble widows many have distinct coloring, and are significantly smaller than " Latrodectus " specimens.
