Dodatak:Popisi paučnjaka, Ku
Kub
uredi- Kubwa singularis Griswold, 2001
Arachnida → Araneae → Cyatholipidae
Kuk
uredi, Kuklosuctobelba
Kukulcania Lehtinen, 1967
uredi- Kukulcania arizonica (Chamberlin & Ivie, 1935)
- Kukulcania brevipes (Keyserling, 1883)
- Kukulcania geophila (Chamberlin & Ivie, 1935)
- Kukulcania geophila wawona (Chamberlin & Ivie, 1942)
- Kukulcania hibernalis (Hentz, 1842) tipična
- Kukulcania hurca (Chamberlin & Ivie, 1942)
- Kukulcania isolinae (Alayón, 1972)
- Kukulcania tractans (O. Pickard-Cambridge, 1896)
- Kukulcania utahana (Chamberlin & Ivie, 1935)
Arachnida → Araneae → Filistatidae
Kul
uredi, Kulalania , Kulievia
Kun
uredi, Kunstella , Kunstidamaeus , Kunstogalumna
Kus
uredi, Kuschelacarus