Widmer, C. L. “The Hydroid and Early Medusa Stages of the Deep Sea Jellyfish Earleria purpurea (Hydrozoa: Mitrocomidae) from the Monterey Bay Submarine Canyon, USA”. Zootaxa, vol. 2902, no. 1, June 2011, pp. 59–68, doi:10.11646/zootaxa.2902.1.3.