The species was described in 1993 from individuals collected near Cooktown and Yeppoon in Queensland, Australia. The wingspan is 13–14 mm for males and 11.5–12.5 mm for females. The forewings are white, speckled with ochreous brown and black scales in alternating longitudinal rows. The hindwings are pale grey-brown. Adults have been recorded on wing in October.
The name of the species is a reference to the fictional two-headed character Zaphod Beeblebrox in The Hitchhiker's Guide to the Galaxy: Erechthias beeblebroxi has markings that resemble a second head.
- "Erechthias beeblebroxi (Robinson & Nielsen, 1993)". Atlas of Living Australia. Retrieved 12 March 2017.
- Schmidt Nielsen, Ebbe; Robinson, Gaden Sutherland (1 January 1993). Tineid Genera of Australia (Lepidoptera). CSIRO Publishing. p. 294. ISBN 9780643050259.
- Robinson, G.S. & E.S. Nielsen, 1993: Tineid Genera of Australia (Lepidoptera). Monographs on Australian Lepidoptera 2: 1–350. Google books: 
- McAlpine, Fraser (July 2016). "10 'Hitchhiker's Guide' References in Pop Culture". BBC America. Retrieved 13 March 2017.
- "Sick puppies, chief nipple twisters and the King of gall wasps". Times Higher Education. September 30, 2005. Retrieved 13 March 2017.
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