Dodatak:Popisi paučnjaka, Is

Isa

, Isala , Isaloides

Isc

, Ischalea , Ischnocolus

Ischnothele Ausserer, 1875

1. Ischnothele annulata Tullgren, 1905
2. Ischnothele caudata Ausserer, 1875
3. Ischnothele digitata (O. Pickard-Cambridge, 1892)
4. Ischnothele garcia Coyle, 1995
5. Ischnothele goloboffi Coyle, 1995
6. Ischnothele guianensis (Walckenaer, 1837)
7. Ischnothele huambisa Coyle, 1995
8. Ischnothele indicola Tikader, 1969
9. Ischnothele jeremie Coyle, 1995
10. Ischnothele longicauda Franganillo, 1930
11. Ischnothele reggae Coyle & Meigs, 1990
12. Ischnothele xera Coyle & Meigs, 1990

Arachnida → Araneae → Dipluridae , Ischnothyrella , Ischnothyreus

Ise

, Isela

Ish

, Ishania

Isi

Isicabu Griswold, 1987

• Isicabu henriki Griswold, 2001
• Isicabu kombo Griswold, 2001
• Isicabu margrethae Griswold, 2001
• Isicabu reavelli Griswold, 1987
• Isicabu zuluensis Griswold, 1987

Arachnida → Araneae → Cyatholipidae

Isigonia Simon, 1897

• Isigonia camacan Brescovit, 1991
• Isigonia limbata Simon, 1897
• Isigonia reducta (Chickering, 1940)

Arachnida → Araneae → Anyphaenidae

Isl

Islandiana Braendegaard, 1932

1. Islandiana cavealis Ivie, 1965
2. Islandiana coconino Ivie, 1965
3. Islandiana cristata Eskov, 1987
4. Islandiana falsifica (Keyserling, 1886) tipična
5. Islandiana flaveola (Banks, 1892)
6. Islandiana flavoides Ivie, 1965
7. Islandiana holmi Ivie, 1965
8. Islandiana lasalana (Chamberlin & Ivie, 1935)
9. Islandiana longisetosa (Emerton, 1882)
10. Islandiana mimbres Ivie, 1965
11. Islandiana muma Ivie, 1965
12. Islandiana princeps Braendegaard, 1932
13. Islandiana speophila Ivie, 1965
14. Islandiana unicornis Ivie, 1965

Arachnida → Araneae → Linyphiidae

Iso

, Isobactrus

Isoctenus Bertkau, 1880

1. Isoctenus areia Polotow & Brescovit, 2009
2. Isoctenus charada Polotow & Brescovit, 2009
3. Isoctenus corymbus Polotow, Brescovit & Pellegatti-Franco, 2005
4. Isoctenus coxalis (F. O. Pickard-Cambridge, 1902)
5. Isoctenus eupalaestrus Mello-Leitão, 1936
6. Isoctenus foliifer Bertkau, 1880
7. Isoctenus griseolus (Mello-Leitão, 1936)
8. Isoctenus herteli (Mello-Leitão, 1947)
9. Isoctenus janeirus (Walckenaer, 1837)
10. Isoctenus malabaris Polotow, Brescovit & Ott, 2007
11. Isoctenus minusculus (Keyserling, 1891)
12. Isoctenus ordinario Polotow & Brescovit, 2009
13. Isoctenus segredo Polotow & Brescovit, 2009
14. Isoctenus strandi Mello-Leitão, 1936
15. Isoctenus taperae (Mello-Leitão, 1936)

Arachnida → Araneae → Ctenidae , Isopeda , Isopedella

Isoxya Simon, 1885

1. Isoxya basilewskyi Benoit & Emerit, 1975
2. Isoxya cicatricosa (C. L. Koch, 1844)
3. Isoxya cowani (Butler, 1882)
4. Isoxya mahafalensis Emerit, 1974
5. Isoxya milloti Emerit, 1974
6. Isoxya mossamedensis Benoit, 1962
7. Isoxya mucronata (Walckenaer, 1841)
8. Isoxya nigromutica (Caporiacco, 1939)
9. Isoxya penizoides Simon, 1887
10. Isoxya reuteri (Lenz, 1886)
11. Isoxya semiflava Simon, 1887
12. Isoxya somalica (Caporiacco, 1940)
13. Isoxya stuhlmanni (Bösenberg & Lenz, 1895)
14. Isoxya tabulata (Thorell, 1859)
15. Isoxya testudinaria (Simon, 1901)
16. Isoxya yatesi Emerit, 1973

Arachnida → Araneae → Araneidae

Isr

Israzorides Levy, 2003

• Israzorides judaeus Levy, 2003

Arachnida → Araneae → Miturgidae

Iss

Issaniella Grandjean, 1962

• Issaniella mograbin Grandjean, 1962

Arachnida → Sarcoptiformes → Oribatida → Hermannielloidea → Hermanniellidae