This is a list of spider species that occur on Socotra. Unless otherwise noted, they are endemic (they occur only there).
Agelenidae Agelenella pusilla (Pocock, 1903)
Araneidae Araneus cardioceros Pocock, 1899 Gasteracantha sanguinolenta C. L. Koch, 1844 — also in Africa and São Tomé Nephila sumptuosa Gerstäcker, 1873 — also in East Africa
Oxyopidae Oxyopes rutilus Simon, 1890 — also in Yemen Peucetia viridis Blackwall, 1858, 1844 — also in Yemen
Barychelidae Atrophothele socotrana Pocock, 1903
Cheiracanthiidae Cheiracanthium socotrense Pocock, 1903
Gnaphosidae Zimiris diffusa Platnick & Penney, 2004 — also in St. Helena and India
Hersiliidae Hersilia wraniki Rheims, Brescovit & van Harten, 2004 — also in Yemen
Migidae Moggridgea socotra Griswold, 1987
Oonopidae Gamasomorpha deksam Saaristo & van Harten, 2002 Orchestina bedu Saaristo & van Harten, 2002 Orchestina foa Saaristo & van Harten, 2002 Silhouettella usgutra Saaristo & van Harten, 2002 Socotroonops socotra Saaristo & van Harten, 2002
Oxyopidae Oxyopes rutilius Simon, 1890 — also in Yemen
Palpimanidae Scelidomachus socotranus Pocock, 1899
Philodromidae Thanatus forbesi Pocock, 1903
Pholcidae Leptopholcus dioscoridis Deeleman-Reinhold & van Harten, 2001
Salticidae Afrobeata firma Wesołowska & van Harten, 1994 Bianor biguttatus Wesołowska & van Harten, 2002 Habrocestum albopunctatum Wesołowska & van Harten, 2002 Habrocestum dubium Wesołowska & van Harten, 2002 Habrocestum ferrugineum Wesołowska & van Harten, 2002 Habrocestum inquinatum Wesołowska & van Harten, 2002 Habrocestum socotrense Wesołowska & van Harten, 2002 Habrocestum speciosum Wesołowska & van Harten, 1994 Hasarius insularis Wesołowska & van Harten, 2002 Heliophanillus suedicola (Simon, 1901) — also in Yemen Heliophanus parvus Wesołowska & van Harten, 1994 Pellenes striolatus Wesołowska & van Harten, 2002 Pseudicius mirus Wesołowska & van Harten, 2002 Rafalus insignipalpis Simon, 1882 — also in Yemen Thyene similis Wesołowska & van Harten, 2002
Sparassidae Olios socotranus (Pocock, 1903)
Tetragnathidae Tetragnatha granti Pocock, 1903
Theraphosidae Monocentropus balfouri Pocock, 1897
Theridiidae Latrodectus hystrix Simon, 1890 — also in Yemen
Thomisidae Bassaniodes socotrensis Pocock, 1903 Dimizonops insularis Pocock, 1903
Zodariidae Cydrela insularis (Pocock, 1899)
References Platnick, N.I. (2007). The world spider catalog, version 7.5. American Museum of Natural History.