George, Z., Siddiqui, G., George, N. and Lucena, R.A. 2020. A new species of Achelia (Pycnogonida: Ammotheidae) and first records of intertidal sea spiders found on Zoanthus (Cnidaria: Zoantharia) from Karachi, Pakistan. Zootaxa. 4821, 2 (Jul. 2020), 371–393. DOI:https://doi.org/10.11646/zootaxa.4821.2.9.