Eratigena
Eratigena is a genus of spider in the family Agelenidae. Most of its species were moved from the genus "Tegenaria" in 2013. Two species that frequently build webs in and around human dwellings are now placed in this genus. "Eratigena agrestis" is the hobo spider, native to Europe and Central Asia, introduced to North America. "Eratigena atrica" is the giant house spider, native to Europe and also introduced into North America. Taxonomy. Phylogeny. Species now placed in the genus "Eratigena" were previously placed in "Tegenaria" and "Malthonica". In 2013, a study was carried out on European house spiders in  the ""Tegenaria-Malthonica" complex". Using both morphological and molecular data, the study found four well-supported clades, one of which constituted a new genus "Eratigena", comprising species formerly placed in "Tegenaria" and "Malthonica". The name "Eratigena" is an anagram of "Tegenaria". (Some "Tegenaria" species had previously been separated into the new genus "Aterigena", another anagram of "Tegenaria".) Although the genera involved in the study were consistently found to be monophyletic, different analyses found different relationships among them. Based on both morphological and DNA data, one hypothesis for the phylogeny of "Eratigena" and related genera is: Identification. Bolzern et al. (2013 ) provide a key to the European agelenid genera. "Eratigena" can be differentiated from "Malthonica" by the un-notched trochanters on legs III and IV (notched in "Malthonica"). The genus differs from "Tegenaria" in the number and size of the teeth on the rear margin of the chelicerae. "Eratigena" has six or more teeth, with those closer to the body of the spider being smaller. "Tegenaria" has three to six large teeth, more or less equal in size. Species. , the World Spider Catalog accepted the following species: