| 1 | Dunlop, J. A., 2000, Character states and evolution of the Chelicerata claws, Europen arachnology, 2000. Aarhus Univ. press. ISBN 87 7934 001 6; 345-354 |
| 2 | Coddington, J. A., Gribet, G., Harvey M. S. , Prendini, L., Walter D. E. The relationships of animals: Ecdysozoans Arachnida 296-318. |
| 3 | Van Der Hammen, 1977 New classification of chelicerata, Zool. mededelingen 51 (20): 307-319. |
| 4 | Van Der Hammen, 1986 Comperative studies in Chelicerata IV. Apatellata, Arachnida, Scorpionida, Xiphosura Zool Verhandelingen 226 (1986) 3-52. |
| 5 | Alberti, G. Peretti, A. V.,2002. Fine structure of male genital system and spem in Solifugae does'nt support sister group relationships with pseudoscorpiones (Arachnida).The Journal of Arachnology 30:268?274 |
| 6 | Wheeler, W. C., Hayashi C. Y., 1998, The phylogeny of extant chelicerata orders, Cladistics, 14 : 173-192 |
| 7 | Lankester, E. R., Structure and classification of the Arachnida Vol +8 part: 2 165-269. |
| 8 | Gribet G., Edgecombe, G.D., Wheeler, W. C. , Babbitt, C., 2002, Phylogeny and systematic position of Opilliones: A combined analysis of Chelicerata relationships using morphological and molecular data, Cladistics, 18: 5- 70 |
| 9 | Schultz, J. W., 2007, A phylogenetic analysis of the arachnid orders based on morphological characters, Zool. Soc. Linn. Soc.150: 221-265 |
| 10 | Dunlop, J. A., 2010, geological history and phylogeny of Chelicerata, Arthropod structure and development, 39: 124-142 |