Plectreuridae

Plectreurid spiders Temporal range: Middle Jurassic - Holocene, 164–0 Ma PreЄ Є O S D C P T J K Pg N
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Male plectreurid
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Chelicerata
Class:	Arachnida
Order:	Araneae
Infraorder:	Araneomorphae
Family:	Plectreuridae Simon, 1893
Genera
†Eoplectreurys Kibramoa Plectreurys
Diversity
4 genera, 33 species
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Plectreuridae, sometimes called plectreurid spiders, are a small spider family confined to the North American deserts and the island of Cuba. 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. 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)

See also

• List of Plectreuridae species
• Spider families