True Facts: The Bizarre Ways Cephalopods Make Bebes

Join me at https://www.patreon.com/truefacts/ Merch: https://ze-true-store.myshopify.com/ TF Educational channel: ⁨ @truefactseducational9288 Apostólico, L.H., Marian, J.E.A.R. Dimorphic male squid show differential gonadal and ejaculate expenditure. Hydrobiologia 808, 5–22 (2018). https://doi.org/10.1007/s10750-017-3145-z Apostólico LH, Marian JEAR. Getting a grip on the squid hectocotylus: Sexually dimorphic glandular system underlies spermatophore transfer in Doryteuthis pleii. Zoology (Jena, Germany). 2026 Mar;175:126328. DOI: 10.1016/j.zool.2026.126328. PMID: 41855842. Arkhipkin, A., & Laptikhovsky, V. (2010). Observation of penis elongation in Onykia ingens. Journal of Molluscan Studies, 76(3), 299–300. https://doi.org/10.1093/mollus/eyq019 Battaglia, P. et al. (2021). When nature continues to surprise: observations of the hectocotylus of Argonauta argo. The European Zoological Journal, 88(1), 980–986. https://doi.org/10.1080/24750263.2021.1970260 Cuccu, Danila et al. (2013). Development of sexual organs and fecundity in Octopus vulgaris Cuvier, 1797 from the Sardinian waters. Mediterranean Marine Science. 14. 270. 10.12681/mms.412. García-Flores, M.et al. (2019). Morphological and histological description of the reproductive system of Octopus hubbsorum . Invertebrate Reproduction & Development, 63(4), 268–281. https://doi.org/10.1080/07924259.2019.1646674 Hall, K.C., & Hanlon, R.T. (2002). Principal features of the mating system of a large spawning aggregation of the giant Australian cuttlefish Sepiaapama (Mollusca: Cephalopoda). Marine Biology, 140, 533-545. Huffard, C. L., & Bartick, M. (2015). Wild Wunderpus photogenicus and Octopus cyanea employ asphyxiating ‘constricting’ in interactions with other octopuses. Molluscan Research, 35(1), 12–16. https://doi.org/10.1080/13235818.2014.909558 Iwata Y, et al. How female squid inseminate their eggs with stored sperm. Curr Biol. 2019 Jan 21;29(2):R48-R49. doi: 10.1016/j.cub.2018.12.010. PMID: 30668945. Morse P and Huffard CL (2019) Tactical Tentacles: New Insights on the Processes of Sexual Selection Among the Cephalopoda. Front. Physiol. 10:1035. doi: 10.3389/fphys.2019.01035 Ibáñez CM et al. (2019) Sexual Selection and the Evolution of Male Reproductive Traits in Benthic Octopuses. Front. Physiol. 10:1238. doi: 10.3389/fphys.2019.01238 López Galán A. et al. (2020) Dynamic Courtship Signals and Mate Preferences in Sepia plangon. Front. Physiol. 11:845. doi: 10.3389/fphys.2020.00845 Marian JE. Spermatophoric reaction reappraised: novel insights into the functioning of the loliginid spermatophore based on Doryteuthis plei. J Morphol. 2012 Mar;273(3):248-78. doi: 10.1002/jmor.11020. Epub 2011 Sep 28. PMID: 21956428. Nakayama A. et al. Ritualized ink use during visual courtship display by males of the sexually dimorphic cuttlefish Sepia andreana. Ecol Evol. 2024 Feb 2;14(2):e10852. doi: 10.1002/ece3.10852. PMID: 38314312; PMCID: PMC10835506. Noriyosi Sato et al. High-speed camera observations of copulatory behaviour in Idiosepius paradoxus: function of the dimorphic hectocotyli, Journal of Molluscan Studies, Volume 79, Issue 2, May 2013, Pages 183–186, https://doi.org/10.1093/mollus/eyt005 Sato N, Kasugai T, Munehara H. Spermatangium formation and sperm discharge in the Japanese pygmy squid Idiosepius paradoxus. Zoology (Jena). 2014 Jun;117(3):192-9. doi: 10.1016/j.zool.2014.02.001. Epub 2014 Apr 18. PMID: 24813852. Sato, Noriyosi et al. “Sperm transfer or spermatangia removal: postcopulatory behaviour of picking up spermatangium by female Japanese pygmy squid.” Marine Biology 160 (2012): 553 - 561. Schnell, A.K. et al. Female receptivity, mating history, and familiarity influence the mating behavior of cuttlefish. Behav Ecol Sociobiol 69, 283–292 (2015). https://doi.org/10.1007/s00265-014-1841-5 So Ryung Shin, Jung Jun Park, Jung Sick Lee. Spermatophore formation in Todarodes pacificus, Tissue and Cell, Volume 104, Part 2,2027,103985, ISSN 0040-8166, https://doi.org/10.1016/j.tice.2026.103985. Villar P. S. et al. ,A sensory system for mating in octopus.Science392,96-101(2026).DOI:10.1126/science.aec9652 Vlasova, E.V., Sabirov, R.M., Golikov, A.V. Reproductive Biology of the Golden Cuttlefish Sepia esculenta (Cephalopoda, Sepiida). Diversity 2023, 15, 455. https://doi.org/10.3390/d15030455 Wada, T., Takegaki, T., Mori, T. et al. Sperm displacement behavior of the cuttlefish Sepia esculenta (Cephalopoda: Sepiidae). J Ethol 23, 85–92 (2005). https://doi.org/10.1007/s10164-005-0146-6 Wodinsky, J. Reversal and transfer of spermatophores by Octopus vulgaris and O. hummelincki . Mar Biol 155, 91–103 (2008). https://doi.org/10.1007/s00227-008-1010-3 Yamamoto, J., Adachi, K., Bower, J.R. et al. Close-up observations on the spawning behavior of a captive Japanese flying squid (Todarodes pacificus). Sci Rep 9, 19739 (2019). https://doi.org/10.1038/s41598-019-56071-0