Chú thích Spirula spirula

  1. ↑ BW Hayward (1977). “Spirula (Sepioidea: Cephalopoda) from the Lower Miocene of Kaipara Harbour, New Zealand (note)” (PDF). New Zealand Journal of Geology and Geophysics.
  2. ↑ Barratt, I. & Allcock, L. (2012). Spirula spirula. The IUCN Red List of Threatened Species. Version 2014.2.

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