Accepted species There are currently 16 accepted species, including one natural hybrid: •
Arachnis annamensis (Rolfe) J.J.Sm. •
Arachnis bella (Rchb.f.) J.J.Sm. •
Arachnis bouffordii Ormerod •
Arachnis calcarata Holttum •
Arachnis cathcartii (Lindl.) J.J.Sm. •
Arachnis clarkei (Rchb.f.) J.J.Sm. •
Arachnis flos-aeris (L.) Rchb.f. •
Arachnis grandisepala J.J.Wood •
Arachnis hookeriana (Rchb.f.) Rchb.f. •
Arachnis labrosa (Lindl. & Paxton) Rchb.f. •
Arachnis limax Seidenf. •
Arachnis longisepala (J.J.Wood) Shim & A.Lamb •
Arachnis × maingayi (Hook.f.) Schltr. •
Arachnis senapatiana (Phukan & A.A.Mao) Kocyan & Schuit. •
Arachnis seramensis (Ormerod) R.Rice •
Arachnis siamensis (Schltr.) Tang & F.T.Wang •
Arachnis sulingi (Blume) Rchb.f.
Species formerly placed in Arachnis •
Arachnis beccarii Rchb.f. is now considered to be
Dimorphorchis beccarii (Rchb.f.) Kocyan & Schuit. •
Arachnis breviscapa (J.J.Sm.) J.J.Sm. is now considered to be
Dimorphorchis breviscapa (J.J.Sm.) Kocyan & Schuit. •
Arachnis celebica (Schltr.) J.J.Sm. is now considered to be
Dimorphorchis celebica (Schltr.) Ormerod •
Arachnis imthurnii (Rolfe) L.O.Williams is now considered to be
Dimorphorchis beccarii var.
imthurnii (Rolfe) Kocyan & Schuit. •
Arachnis longicaulis (Schltr.) L.O.Williams is now considered to be
Dimorphorchis breviscapa (J.J.Sm.) Kocyan & Schuit. •
Arachnis lyonii Ames is now considered to be
Dimorphorchis lyonii (Ames) Ormerod •
Arachnis muelleri (Kraenzl.) J.J.Sm. is now considered to be
Dimorphorchis beccarii var.
beccarii •
Arachnis philippinensis (Lindl.) Ames is now considered to be
Trichoglottis philippinensis Lindl. •
Arachnis rohaniana (Rchb.f.) Rchb.f. is now considered to be
Dimorphorchis rohaniana (Rchb.f.) P.J.Cribb •
Arachnis beccarii var.
imthurnii (Rolfe) K.W.Tan is now considered to be
Dimorphorchis beccarii var.
imthurnii (Rolfe) Kocyan & Schuit. •
Arachnis longicaulis f.
flavescens Valmayor & D.Tiu is now considered to be
Dimorphorchis breviscapa (J.J.Sm.) Kocyan & Schuit. ==Conservation==