Plectreuridae, sometimes called plectreurid spiders, are a small spider family confined to the Southwestern United States, Mexico, and the Caribbean. Only two living genera are known - the nominate genus Plectreurys and Kibramoa. In the past, the family was more widespread, with the Jurassic genus Eoplectreurys known from China, the Eocene Palaeoplectreurys baltica from Baltic amber and the Miocene Plectreurys pittfieldi from Dominican amber.

These ecribellate (lacking a plate-like woolly silk-producing structure anterior to the spinnerets on the venter), haplogyne spiders build haphazard webs under rocks and dead cacti. Adult males can be found wandering at night. Relatively little is known of their biology. Unlike the sicariids, scytodids and diguetids, to which they are most closely related, they have eight eyes. In appearance females of Plectreurys resemble those of the larger species of the cribellate Filistatidae. They differ in their eye arrangement and in having the first femora (third leg segment from the body) bowed.

Species

†Eoplectreurys Selden & Huang, 2010

†Eoplectreurys gertschi Selden & Huang, 2010 (Middle Jurassic, China)
Kibramoa Chamberlin, 1924

Kibramoa guapa Gertsch, 1958 (USA, Mexico)
Kibramoa hermani Chamberlin & Ivie, 1935 (USA)
Kibramoa isolata Gertsch, 1958 (Mexico)
Kibramoa madrona Gertsch, 1958 (USA)
Kibramoa paiuta Gertsch, 1958 (USA)
Kibramoa suprenans (Chamberlin, 1919) (USA)
Kibramoa suprenans pima Gertsch, 1958 (USA)
Kibramoa yuma Gertsch, 1958 (USA)
Plectreurys Simon, 1893

Plectreurys angela Gertsch, 1958 (USA)
Plectreurys ardea Gertsch, 1958 (Mexico)
Plectreurys arida Gertsch, 1958 (Mexico)
Plectreurys bicolor Banks, 1898 (Mexico)
Plectreurys castanea Simon, 1893 (USA)
Plectreurys ceralbona Chamberlin, 1924 (Mexico)
Plectreurys conifera Gertsch, 1958 (USA)
Plectreurys deserta Gertsch, 1958 (USA)
Plectreurys globosa Franganillo, 1931 (Cuba)
Plectreurys hatibonico Alayón, 2003 (Cuba)
Plectreurys janzen Alayón & Víquez, 2011, (Guatemala to Costa Rica)
Plectreurys misteca Gertsch, 1958 (Mexico)
Plectreurys mojavea Gertsch, 1958 (USA)
Plectreurys monterea Gertsch, 1958 (USA)
Plectreurys nahuana Gertsch, 1958 (Mexico)
Plectreurys oasa Gertsch, 1958 (USA)
Plectreurys paisana Gertsch, 1958 (Mexico)
†Plectreurys pittfieldi Penney 2009 (Miocene, Dominican Amber)
Plectreurys schicki Gertsch, 1958 (USA)
Plectreurys tecate Gertsch, 1958 (Mexico)
Plectreurys tristis Simon, 1893 (USA, Mexico)
Plectreurys valens Chamberlin, 1924 (Mexico)
Plectreurys vaquera Gertsch, 1958 (Mexico)
Plectreurys zacateca Gertsch, 1958 (Mexico)
Tentatively placed in Plectreuridae:

†Palaeoplectreurys Wunderlich, 2004
†Palaeoplectreurys baltica Wunderlich, 2004 (Late Eocene, Baltic Amber)
^ T. L. Carpenter, B. J. Bernacky, and E. E. Stabell: "Human Envenomization by Plectreurys tristis Simon (Araneae: Plectreuridae): A Case Report" in Journal of Medical Entomology, Vol. 28 (1991), No. 3, pp. 477-478.

source - Wikipedia
if u like the post please like and shear

Because the study material is quite expensive, not all can buy it. The RBbox does the same small cache of the same information and study material to reach you for free. You also help in making this case successful by cooperating. You also have some information that you can send to others as a post or article. We will publish it with your name and picture. www.rbbox.in