| steinernema pakistanense | Yes | species | eukaryota | invertebrates | species | 232967 | click here |
| steinernema poinari | Yes | species | | | species | 1400046 | click here |
| steinernema puertoricense | Yes | species | eukaryota | invertebrates | species | 172743 | click here |
| steinernema puntauvense | Yes | species | eukaryota | invertebrates | species | 418093 | click here |
| steinernema rarum | Yes | species | eukaryota | invertebrates | species | 172744 | click here |
| steinernema riobrave | Yes | species | eukaryota | invertebrates | species | 52067 | click here |
| steinernema sacchari | Yes | species | | | species | 1407673 | click here |
| steinernema sangi | Yes | species | eukaryota | invertebrates | species | 253227 | click here |
| steinernema scapterisci | Yes | species | eukaryota | invertebrates | species | 90986 | click here |
| steinernema scarabaei | Yes | species | eukaryota | invertebrates | species | 221332 | click here |
| steinernema schliemanni | Yes | species | eukaryota | invertebrates | species | 881192 | click here |
| steinernema serratum | Yes | species | eukaryota | invertebrates | species | 52069 | click here |
| steinernema siamkayai | Yes | species | eukaryota | invertebrates | species | 172568 | click here |
| steinernema sichuanense | Yes | species | eukaryota | invertebrates | species | 407370 | click here |
| steinernema silvaticum | Yes | species | eukaryota | invertebrates | species | 373742 | click here |
| steinernema sp. hbg28 | Yes | no rank | | | species | 1537671 | click here |
| steinernema sp. my3 | Yes | no rank | eukaryota | invertebrates | species | 361184 | click here |
| steinernema sp. my5 | Yes | no rank | eukaryota | invertebrates | species | 361180 | click here |
| steinernema sp. my7 | Yes | no rank | eukaryota | invertebrates | species | 361178 | click here |
| steinernema sp. my8 | Yes | no rank | eukaryota | invertebrates | species | 361179 | click here |
| steinernema sp. vp-2015c | Yes | no rank | | | species | 1705073 | click here |
| steinernema surkhetense | Yes | species | | | species | 1111992 | click here |
| steinernema thermophilum | Yes | species | eukaryota | invertebrates | species | 394237 | click here |
| steinernema websteri | Yes | species | eukaryota | invertebrates | species | 311880 | click here |
| steinernema weiseri | Yes | species | eukaryota | invertebrates | species | 374389 | click here |
| steinernema yirgalemense | Yes | species | eukaryota | invertebrates | species | 310844 | click here |
| steinernematidae | Yes | | | invertebrates | family | 33253 | click here |
| stellera chamaejasme | Yes | species | eukaryota | plants | species | 142738 | click here |
| stenella coeruleoalba | Yes | species | eukaryota | mammals | species | 9737 | click here |
| stercorarius antarcticus | Yes | species | eukaryota | vertebrates | species | 555350 | click here |
| sterna hirundo | Yes | species | eukaryota | vertebrates | species | 108405 | click here |
| sternotherus odoratus | Yes | species | eukaryota | vertebrates | species | 142480 | click here |
| stetsonia coryne | Yes | species | eukaryota | plants | species | 153897 | click here |
| stevia rebaudiana | Yes | species | eukaryota | plants | species | 55670 | click here |
| stigmochelys pardalis | Yes | species | eukaryota | vertebrates | species | 569598 | click here |
| stomaphis | Yes | | | invertebrates | genus | 96548 | click here |
| stomaphis aphananthae | Yes | species | eukaryota | invertebrates | species | 97071 | click here |
| stomaphis betulidahuricae | Yes | species | | | species | 1244028 | click here |
| stomaphis fagi | Yes | species | eukaryota | invertebrates | species | 97072 | click here |
| stomaphis longirostris | Yes | species | eukaryota | invertebrates | species | 97075 | click here |
| stomaphis pini | Yes | species | eukaryota | invertebrates | species | 97076 | click here |
| stomaphis quercisucta | Yes | species | | | species | 1244030 | click here |
| stomaphis quercus | Yes | species | eukaryota | invertebrates | species | 97077 | click here |
| stomaphis sinisalicis | Yes | species | | | species | 1064604 | click here |
| stomaphis takahashii | Yes | species | eukaryota | invertebrates | species | 96554 | click here |
| stomaphis yanonis | Yes | species | eukaryota | invertebrates | species | 97078 | click here |
| stomoxys calcitrans | Yes | species | eukaryota | invertebrates | species | 35570 | click here |
| stomoxys indicus | Yes | species | eukaryota | invertebrates | species | 520036 | click here |
| strabomantis bufoniformis | Yes | species | eukaryota | vertebrates | species | 356177 | click here |
| strepera graculina | Yes | species | eukaryota | vertebrates | species | 254663 | click here |
| streptocarpus ionanthus | Yes | species | eukaryota | plants | species | 85262 | click here |
| streptocarpus sect. saintpaulia | Yes | | | plants | genus | 48792 | click here |
| streptopelia chinensis | Yes | species | eukaryota | vertebrates | species | 115700 | click here |
| streptopelia decaocto | Yes | species | eukaryota | vertebrates | species | 177147 | click here |
| streptopelia orientalis | Yes | species | eukaryota | vertebrates | species | 36243 | click here |
| streptopelia senegalensis | Yes | species | eukaryota | vertebrates | species | 135635 | click here |
| streptopelia turtur | Yes | species | eukaryota | vertebrates | species | 177155 | click here |
| strigiformes | Yes | | | vertebrates | order | 30458 | click here |
| strigops habroptila | Yes | species | | | species | 2489341 | click here |
| strigops habroptilus | Yes | species | eukaryota | vertebrates | species | 57251 | click here |
| strix aluco | Yes | species | eukaryota | vertebrates | species | 111821 | click here |
| stromatium barbatum | Yes | species | | | species | 1784978 | click here |
| strombus gigas | Yes | species | eukaryota | invertebrates | species | 291982 | click here |
| struthio camelus | Yes | species | eukaryota | vertebrates | species | 8801 | click here |
| sturnira lilium | Yes | species | eukaryota | mammals | species | 27660 | click here |
| sturnus cineraceus | Yes | species | eukaryota | vertebrates | species | 36269 | click here |
| sturnus unicolor | Yes | species | eukaryota | vertebrates | species | 381112 | click here |
| sturnus vulgaris | Yes | species | eukaryota | vertebrates | species | 9172 | click here |
| suaeda australis | Yes | species | eukaryota | plants | species | 224159 | click here |
| suaeda glauca | Yes | species | eukaryota | plants | species | 397272 | click here |
| suaeda maritima | Yes | species | eukaryota | plants | species | 126913 | click here |
| suaeda mollis | Yes | species | eukaryota | plants | species | 648826 | click here |
| suaeda monoica | Yes | species | eukaryota | plants | species | 224178 | click here |
| suaeda salsa | Yes | species | eukaryota | plants | species | 126914 | click here |
| suillus | Yes | | | plants | genus | 5379 | click here |
| suillus bovinus | Yes | species | eukaryota | plants | species | 48563 | click here |
| suillus variegatus | Yes | species | eukaryota | plants | species | 48592 | click here |
| suina | Yes | | | mammals | infraorder | 35497 | click here |
| sulla pallida | Yes | species | eukaryota | plants | species | 754905 | click here |
| suncus murinus | Yes | species | eukaryota | mammals | species | 9378 | click here |
| suricata suricatta | Yes | species | eukaryota | mammals | species | 37032 | click here |
| sus | Yes | | | mammals | genus | 9822 | click here |
| sus cebifrons | Yes | species | eukaryota | mammals | species | 315377 | click here |
| sus scrofa | Yes | species | eukaryota | mammals | species | 9823 | click here |
| sus scrofa domesticus | Yes | subspecies | eukaryota | mammals | subspecies | 9825 | click here |
| sus scrofa scrofa | Yes | subspecies | eukaryota | mammals | subspecies | 415978 | click here |
| sus sp. | Yes | no rank | eukaryota | mammals | species | 9826 | click here |
| sylvicapra grimmia | Yes | species | eukaryota | mammals | species | 119562 | click here |
| sylvilagus | Yes | | | mammals | genus | 9987 | click here |
| sylvilagus audubonii | Yes | species | eukaryota | mammals | species | 30581 | click here |
| sylvilagus brasiliensis | Yes | species | eukaryota | mammals | species | 483865 | click here |
| sylvilagus floridanus | Yes | species | eukaryota | mammals | species | 9988 | click here |
| symphalangus syndactylus | Yes | species | eukaryota | primates | species | 9590 | click here |
| symphysodon discus | Yes | species | eukaryota | vertebrates | species | 306559 | click here |
| symphytum officinale | Yes | species | eukaryota | plants | species | 278672 | click here |
| symphytum tuberosum | Yes | species | eukaryota | plants | species | 256504 | click here |
| syncerus caffer | Yes | species | eukaryota | mammals | species | 9970 | click here |
| syncerus caffer caffer | Yes | subspecies | eukaryota | mammals | subspecies | 37445 | click here |
| syncerus caffer nanus | Yes | subspecies | eukaryota | mammals | subspecies | 37446 | click here |
| syngonium | Yes | | | plants | genus | 201273 | click here |