Tan, K.W. 1975. Taxonomy of Arachnis, Armodorum, Esmeralda and Dimorphorchis, Part I. Selbyana 1: 1-15.Tan, K.W. 1976. Taxonomy of Arachnis, Armodorum, Esmeralda and Dimorphorchis, Part II. Selbyana 1: 365-373.
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