All (in this database) Arachnids list (Scientific names): Part R
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- radiata (Walcknenaer, 1842) (Neriene)
- radiata (Grube, 1859) (Marpissa)
- radicicola (Koch, 1872) (Pelecopsis)
- raeticum Schweizer & Bader, 1963 (Trombidium)
- ramosa Jackson, 1912 (Agyneta)
- ramosus (Panzer, 1804) (Oxyopes)
- reclusa O. P.-Cambridge, 1863 (Clubiona)
- rectangulata (Emerton, 1915) (Diplocentria)
- rectangulata (Microcentria), see Diplocentria rectangulata
- redii (Scopoli, 1763) (Agalenatea)
- reticulatus (Blackwall, 1853) (Neon)
- retusus (Westring, 1851) (Oedothorax)
- reussi (Thorell, 1871) (Silometopus)
- rhophalicus (Vercammen-Grandjean & Popp, 1967) (Trombidium)
- ricinus (Linnaeus, 1758) (Ixodes)
- rimosum C. L. Koch, 1837 (Trombidium)
- riparia (C. L. Koch, 1833) (Pardosa)
- riparia (Blackwall, 1834) (Achaearanea)
- riparia (Lycosa), see Pardosa riparia
- Robertus (Theridiidae)
- robustum (Westring, 1851) (Leptorhoptrum)
- robustus (Hahn, 1831) (Xysticus)
- rosenhaueri (L. Koch, 1872) (Porrhomma)
- roseum Clerck, 757, see Micrommata virescens
- rowmundi Haitlinger, 1996 (Trombidium)
- rubellum (Blackwall, 1841) (Gonatium)
- rubellus (Gonatium), see Gonatium rubellum
- rubens (Blackwall, 1833) (Gonatium)
- rubrofasciata (Ohlert, 1865) (Hygrolycosa)
- rudis (Sundevall, 1832) (Dendryphantes)
- rufipes (Linnaeus, 1758) (Gongylidium)
- rufus (Wider, 1834) (Macrargus)
- rufus Walckenaer, 1825 (Philodromus)
- rupestre (Leiobunum)
- rupicola (Walckenaer, 1830) (Liocranum)
- rurestris (C. L. Koch, 1836) (Meioneta)
- ruricola (Degeer, 1778) (Trochosa)
- rusticus (L. Koch, 1872) (Zelotes)
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Markku Savela