| Subject | English | Latin |
| ichtyol. | Agassiz's thread-sail fish | Chlorophthalmus agassizii |
| ichtyol. | Atlantic thread herring | Opisthonema oglinum |
| reptil. | beaked thread snake | Leptotyphlops macrorhynchus |
| entomol. | black thread scale | Ischnaspis longirostris |
| nat.sc., agric. | black thread scale | Ischnaspis filiformis |
| ichtyol. | black-tailed thread eel | Moringua bicolor |
| fish.farm. | deep-body thread herring | Opisthonema libertate |
| ichtyol. | four-thread tasselfish | Eleutheronema tetradactylum |
| ichtyol. | Galapagos thread herring | Opisthonema berlangai |
| entomol. | gold thread | Cuscuta spp. |
| biol. | gold-thread | Coptis chinensis Fr. |
| biol. | gold-thread | Captis Salisb |
| nat.sc., agric. | golden thread-fin bream | Nemipterus virgatus |
| ichtyol. | Indian thread-finned trevally | Alectis indicus |
| reptil. | Jan's coral thread snake | Leptomicrurus narduccii |
| ichtyol. | Japanese thread-finned shad | Nematalosa japonica |
| ichtyol. | Japanese thread-sail fish | Hime japonica |
| ichtyol. | Japanese thread-sail fish | Hime japonicus |
| ichtyol. | Japanese thread-sail fishes | Hime |
| ichtyol. | large thread-finned jackfish | Alectis indicus |
| coff. | marasmoid thread blight | Marasmius |
| ichtyol. | middling thread herring | Opisthonema medirastre |
| ichtyol. | Pacific thread herring | Opisthonema medirastre |
| fish.farm. | Pacific thread herring | Opisthonema libertate |
| agric. | red thread | Laetisaria fuciformis |
| reptil. | Schlegel's thread coral snake | Leptomicrurus Coleonyx |
| reptil. | Schmidt's thread coral snake | Leptomicrurus Schistometopum |
| reptil. | Sind thread snake | Leptotyphlops blanfordi |
| ichtyol. | slender thread herring | Opisthonema bulleri |
| ichtyol. | striped thread-tailed gudgeon | Eleotriodes helsdingenii |
| med. | terminal thread | filum terminale |
| ichtyol. | thread-backed butterfly fish | Heniochus acuminatus |
| ichtyol. | thread-bearded dragonfish | Fragellostomias boureei |
| reptil. | thread coral snakes | Leptomicrurus |
| ichtyol. | thread eels | Nemichthyidae |
| ichtyol. | thread eels | Nemichthys |
| ichtyol. | thread eels | Moringuidae |
| nat.sc., agric. | thread-fin breams | Nemipterus |
| fish.farm. | thread-fin breams | Nemipteridae |
| nat.sc., agric. | thread-fin breams | Nemipterus spp. |
| ichtyol. | thread fin slickhead | Talismania bifurcata |
| ichtyol. | thread-finned brotula | Homostolus iaponicus |
| ichtyol. | thread-finned gizzard shad | Nematalosa nasus |
| ichtyol. | thread-finned goosefish | Lophiodes spirulus |
| ichtyol. | thread-finned jackfish | Alectis ciliaris |
| ichtyol. | thread-finned mirrorfish | Alectis ciliaris |
| ichtyol. | thread-finned shads | Nematalosa |
| ichtyol. | thread-finned trevally | Alectis ciliaris |
| reptil. | thread-form coral snake | Micrurus fileformis |
| fish.farm. | thread herring | Opisthonema oglinum |
| fish.farm. | thread herring | Opisthonema libertate |
| ichtyol. | thread herrings nei | Opisthonema spp |
| ichtyol. | thread herrings | Opisthonema |
| fish.farm. | thread herrings | Opisthonema spp. |
| zool. | thread-horns | Nematocera |
| nat.sc., agric. | thread laver | Enteromorpha compressa |
| environ., nat.res. | thread-leaved sundew | Drosera filiformis |
| bot. | thread-leaved water-crowfoot var. diffusus | Batrachium aquatile L. Dumort. |
| bot. | thread-leaved water-crowfoot var. diffusus | Ranunculus paucistamineus auct. (var. aquatilis) |
| bot. | thread-leaved water-crowfoot var. diffusus | Ranunculus paucistamineus Tausch |
| nat.res. | thread-leaved water-crowfoot | Ranunculus trichophyllus |
| nat.sc., agric. | thread-leaved water-crowfoot | Batrachium trichophyllum van den Bosch |
| nat.sc., agric. | thread-leaved water-crowfoot | Ranunculus trichophyllus Chaix |
| bot. | thread-leaved water-crowfoot var. diffusus | Ranunculus trichophyllus Chaix (var. diffusus) |
| bot. | thread-leaved water-crowfoot var. diffusus | Ranunculus paucistamineus Tausch var. drouetii F. W. Schultz ex Gren. Gelert |
| bot. | thread-leaved water-crowfoot var. diffusus | Batrachium trichophyllum Chaix Bosch |
| bot. | thread-leaved water-crowfoot var. diffusus | Ranunculus aquatilis L. |
| biol. | thread-legged bugs | Ploiariidae (复) |
| ichtyol. | thread pompano | Alectis ciliaris |
| environ., nat.res. | thread rush | Juncus filiformis |
| nat.sc., agric. | thread rush | Juncus filiformis L. |
| nat.sc., agric. | thread-sail filefish | Stephanolepis cirrhifer |
| nat.sc., agric. | thread-sail filefish | Stephanolepis cirrhifer Temminck and Schlegel,1850 |
| ichtyol. | thread-sail fishes | Aulopodidae |
| entomol. | thread scale | Ischnaspis longirostris |
| reptil. | thread snake | Leptotyphlops scutifrons |
| reptil. | thread snake | Leptotyphlops Lobulia |
| reptil. | thread snake | Leptotyphlops nigrescens |
| reptil. | thread snake | Leptotyphlops conjunctus |
| reptil. | thread snakes | Leptotyphlopidae |
| ichtyol. | thread-tail Maori wrasse | Cheilinus bimaculatus |
| entomol. | thread-tailed stoneflies | Nemouridae |
| zool. | thread-waisted wasps | Sphecidae |
| biol. | thread-waisted wasps | Sphecoidea |
| entomol. | thread-winged lacewings | Nemopteridae |
| zool. | thread worm | Nematoda |
| reptil. | Transvaal thread snake | Leptotyphlops distanti |
| ichtyol. | white threads fish | Holothuria leucospilota |