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. 2021 Mar 30;11:7135. doi: 10.1038/s41598-021-86248-5

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Lappetascaris sp. and Anisakis physeteris in Histioteuthis squids collected from the Tyrrhenian Sea. Lappetascaris larva in the mantle musculature of an umbrella squid (a). Anisakis physeteris in the testis of an umbrella squid. Note the worm extremities reddish in colour (b). Microscopic view of Lappetascaris sp. larva (c) and A. physeteris showing the extremities reddish in colour and ventriculus (arrow) (d). Cephalic extremity of Lappetascaris sp. larva showing sclerotized formations (arrows) (e). Caudal extremity of Lappetascaris sp. larva showing anus (black arrow) and cuticular spike (white arrow) (f). Scale bar: 2000 µm (a); 1000 µm (b,c,d); 50 µm (e,f).