World Register of Marine Species (WoRMS)
Paracis rigida (Thomson & Simpson, 1909)
McFadden, C.S.; Cordeiro, R.; Samimi-Namin, K.; Hoeksema, B.W., Williams, G.; van Ofwegen, L.P. (2026). World List of Octocorallia. Paracis rigida (Thomson & Simpson, 1909). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=290620 on 2026-08-10
Thomson, J.A.; Simpson, J.J. (1909). An account of the alcyonarians collected by the Royal Indian Marine Survey Ship 'Investigator' in the Indian Ocean. II. The alcyonarians of the littoral area. Trustees of the Indian Museum, Calcutta. 2: 1-319, 9 plates.