Another inking during copulation in Idiosepius paradoxus (12.7MB, 00:00:32)
		species Idiosepius paradoxus Key Words
	Noriyosi Sato 2024/11/08 submitted

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Animalia >Mollusca >Cephalopoda >Sepiolidea >Idiosepiidae >Idiosepius >

0:07, A male is approaching to a female attached to a plastic bar. 0:09, This male ejected an ink blob and then grabbed the female to transfer its spermatophores. 0:13, The male stopped copulating and swam away. 0:26, Some empty cases of spermatophores were spitted out.

Below is the abstract from the article containing this video:

Most cephalopods (octopus, squid and cuttlefish) possess an ink sac and their inking behavior is renowned for their anti- predatory defense. The deployment of a small ink cloud by a rapidly moving cephalopod can serve as a decoy that deceives visual predators. Cephalopods can also discharge a significant amount of ink as a smokescreen to startle their enemy and obstruct visual contact, eliminating immediate threats when threatened by predators. Aside from defense purposes, inking by cephalopods serves alternative functions during predation, courtship and agonistic behavior noted by recent studies. Here we show two unique inking behaviors of the pygmy squid which likely increases their mating success rate. The present study suggests that another co-option of inking likely exists in this group of small squid. Digital video images related to the article are available at http://www.momo-p.com/showdetail-e.php?movieid=momo241016ip01a, http://www.momo-p.com/showdetail-e.php?movieid=momo241016ip02a, http://www.momo-p.com/showdetail-e.php?movieid=momo241016ih01a, and http://www.momo-p.com/showdetail-e.php?movieid=momo241016ih02a.

Noriyosi Sato, Ryohei Tanabe, Wen‐Sung Chung, Mizuki Yamada, Arata Nakayama, and Yoko Iwata (2025). Squirting ink may play a role in the copulation of the pygmy squid. J. Ethol. 10.1007/s10164-024-00829-1

(Data No.momo241016ip02a)

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