List of species named simplex
The species name simplex (Latin for "simple") occurs frequently in binomial names throughout the taxonomy of life. Examples include:
Plants
Monocots
- Amitostigma simplex, a species of plant in the family Orchidaceae
 - Bulbophyllum simplex, a species of orchid in the genus Bulbophyllum
 - Coelogyne simplex, a species of orchid
 - Puccinellia simplex, a species of grass known by the common names western alkali grass and California alkali grass
 - Oenocarpus simplex, a species of flowering plant in the family Arecaceae
 - Vriesea simplex, a species of the genus Vriesea
 
Eudicots
- Acacia simplex, perennial climbing tree native to islands in the western part of the Pacific Ocean
 - Buddleja simplex, a small shrub, probably extinct, as no record of it has been made for nearly 200 years
 - Brassaiopsis simplex, a species of plant in the family Araliaceae
 - Echium simplex (Tower of jewels), herbaceous biennial plant up to 3 m in height on the island of Tenerife mainly in Macizo de Anaga
 - Firmiana simplex, the Chinese parasol tree or wutong, an ornamental plant or tree of the cacao, or chocolate family Sterculiaceae of the order Malvales, native to Asia
 - Gentianopsis simplex, a species of flowering plant in the gentian family known by the common name oneflower fringed gentian
 - Gymnophragma simplex, a species of flowering plant belonging to the family Acanthaceae
 - Pseudopanax simplex, a species of evergreen plant
 - Stirlingia simplex, plant endemic to Western Australia
 - Thalictrum simplex, a species of plant in the family Ranunculaceae
 - Utricularia simplex, commonly known as bluecoats, is a very small perennial carnivorous plant that belongs to the genus Utricularia
 
Fungi
- Acrodontium simplex, ascomycete fungus that is a plant pathogen
 - Pleomeris simplex or Puccinia hordei, a plant pathogen
 
Animals
Cnidaria
- Protanthea simplex, a species of sea anemone found in deep water off the coasts of north west Europe
 - Tubularia simplex, or oaten pipes hydroid, a species of hydroid native to the northeast Atlantic Ocean, North Sea, Norwegian Sea, and English Channel
 
Molluscs
Bivalves
- Anomia simplex, or the common jingle shell, a species of bivalve mollusc in the family Anomiidae
 
Gastropods (snails and slugs)
- Arinia simplex, a species of small land snails with an operculum, terrestrial gastropod mollusks in the family Diplommatinidae
 - Bittium simplex, a species of sea snail, a marine gastropod mollusk in the family Cerithiidae
 - Blanfordia simplex, a species of land snail that has an operculum, a terrestrial gastropod mollusk in the family Pomatiopsidae
 - Boucardicus simplex, a species of land snail with an operculum, a terrestrial gastropod mollusk in the family Cyclophoridae
 - Calliostoma simplex, a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae
 - Cirsonella simplex, small sea snail, a marine gastropod mollusc in the family Turbinidae
 - Cristilabrum simplex, a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Camaenidae
 - Enatimene simplex, a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails
 - Eulimella simplex, a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies
 - Janoliva simplex, a species of sea snail, a marine gastropod mollusk in the family Olividae, the olives
 - Mohnia simplex, a species of sea snail, a marine gastropod mollusk in the family Buccinidae, the true whelks
 - Natica simplex, a species of predatory sea snail, a marine gastropod mollusk in the family Naticidae, the moon snails
 - Obesotoma simplex, a species of sea snail, a marine gastropod mollusk in the family Mangeliidae
 - Opisthostoma simplex, a species of small land snail with an operculum, a terrestrial gastropod mollusk in the family Diplommatinidae
 - Pepta simplex, a species of sea snail, a marine gastropod mollusk in the family Cancellariidae, the nutmeg snails
 - Pyrgulopsis simplex or fossil springsnail, a species of small freshwater spring snails, aquatic gastropod mollusks or micromollusks in the family Hydrobiidae
 - Serrata simplex, a species of sea snail, a marine gastropod mollusk in the family Marginellidae, the margin snails
 - Sukashitrochus simplex or Sukashitrochus morleti, a species of sea snail, a marine gastropod mollusk in the family Scissurellidae
 
Arthropods
Arachnids
- Argiope simplex or Argiope trifasciata, also called banded garden spider in the USA, a species of spider found around the world
 - Digamasellus simplex, mite in the family Digamasellidae
 - Gamasellus simplex, in the genus of mites in the family Ologamasidae
 - Halolaelaps simplex, family of mites in the order Mesostigmata
 
Crustaceans
- Acartia simplex, a species of marine copepod belonging to the family Acartiidae
 - Asconiscus simplex, the only species in the genus Asconiscus, family of marine isopod crustaceans in the suborder Cymothoida
 - Branchinella simplex, a species of crustacean in the family Thamnocephalidae
 - Ovatis simplex, a species of crabs in the family Xanthidae, the only species in the genus Ovatis
 - Paradiaptomus simplex, a species of copepod in the family Diaptomidae
 - Tropodiaptomus simplex, copepod in the family Diaptomidae
 
Insects
Lepidoptera (butterflies and moths)
Moths of the family Noctuidae:
- Achaea simplex, a species of moth of the family Noctuidae
 - Avatha simplex, a species of moth of the family Noctuidae
 - Cyligramma simplex, moth of the family Noctuidae
 - Penicillaria simplex, moth of the family Noctuidae
 - Plusia simplex or Anagrapha falcifera, a moth of the family Noctuidae
 - Schinia simplex, moth of the family Noctuidae
 - Schrankia simplex or Schrankia altivolans, moth of the family Noctuidae
 - Speiredonia simplex, a species of moth of the family Noctuidae
 
Other lepidopterans:
- Aloeides simplex, a butterfly of the family Lycaenidae
 - Anatrachyntis simplex, moth in the family Cosmopterigidae
 - Azygophleps simplex, moth in the family Cossidae
 - Chilo simplex or Chilo suppressalis, moth of the family Crambidae
 - Coleophora simplex, moth of the family Coleophoridae
 - Endotricha simplex, a species of snout moths in the genus Endotricha
 - Eriogaster simplex or Panacela lewinae is a moth of the family Eupterotidae
 - Eulophota simplex, a species of snout moths in the genus Eulophota
 - Hemistola simplex, moth of the family Geometridae
 - Oroplema simplex, a species of moth of the family Uraniidae
 - Proutiella simplex, moth of the family Notodontidae
 
Other insects
- Anabrus simplex or Mormon cricket, large insect that can grow to almost three inches in length
 - Chlaenius simplex, a ground beetle in the large and diverse genus Chlaenius
 - Holcobius simplex, beetle species in the family Anobiidae
 - Mirosternus simplex, beetle species in the family Anobiidae
 - Rhadinosticta simplex or Rhadinosticta, a species of damselfly in the family Isostictidae
 - Rhamphomyia simplex, a species of dance fly, in the fly family Empididae
 - Thesprotia simplex, common name grass mantis, is a species of praying mantis found in Brazil
 - Urophora simplex, a species of tephritid or fruit flies in the genus Urophora of the family Tephritidae
 
Chordates
Birds
- Anthreptes simplex or plain sunbird, a species of bird in the family Nectariniidae
 - Calamonastes simplex or grey wren warbler, a species of bird in the family Cisticolidae
 - Chlorocichla simplex or simple greenbul, a species of songbird in the family Pycnonotidae
 - Columba simplex or lemon dove or cinnamon dove, a bird species in the pigeon family (Columbidae)
 - Geoffroyus simplex, blue-collared parrot, simple parrot, lilac-collared song parrot, or lilac-collared Geoffroy's parrot, found in New Guinea
 - Myrmothera simplex or tepui antpitta or brown-breasted antpitta, a species of bird in the family Formicariidae
 - Pachycephala simplex or grey whistler, a species of bird in the family Pachycephalidae
 - Passer simplex or desert sparrow, a bird of the sparrow family Passeridae
 - Phaetusa simplex or large-billed tern, a species of tern in the family Sternidae
 - Piculus simplex or Rufous-winged Woodpecker, a species of bird in the family Picidae
 - Pogoniulus simplex or green tinkerbird, a species of bird in the family Lybiidae
 - Pseudotriccus simplex or hazel-fronted pygmy tyrant, a species of bird in the family Tyrannidae
 - Pycnonotus simplex or cream-vented bulbul, a species of songbird in the family Pycnonotidae
 - Rhytipterna simplex or greyish mourner, a species of bird in the family Tyrannidae
 - Sporophila simplex or drab seedeater, a species of bird in the family Thraupidae
 
Other vertebrates
- Betta simplex, a species of fish in the family Osphronemidae
 - Hesperomys simplex, a species of rodent in the family Cricetidae from south-central South America
 - Hyla simplex, a species of frog in the family Hylidae
 - Melanophryniscus simplex, a species of toad in the family Bufonidae
 - Sarcoglanis simplex, a species of catfish (order Siluriformes) of the family Trichomycteridae, and the only species of the genus Sarcoglanis
 
Bacteria
- Nemiana simplex, the only species in Nemiana, a genus of simple, sessile organisms possibly a synonym of Beltanella.The species was formerly tentatively classified as a cnidarian.