Category:Media from Justine et al. 2022 - PeerJ/12725

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Jean-Lou Justine​, Romain Gastineau, Pierre Gros, Delphine Gey, Enrico Ruzzier, Laurent Charles, & Leigh Winsor

(2022-02-01). "Hammerhead flatworms (Platyhelminthes, Geoplanidae, Bipaliinae): mitochondrial genomes and description of two new species from France, Italy, and Mayotte". PeerJ 10: e12725. PeerJ. DOI:10.7717/peerj.12725. ISSN 2167-8359.

<nowiki>Hammerhead flatworms (Platyhelminthes, Geoplanidae, Bipaliinae): mitochondrial genomes and description of two new species from France, Italy, and Mayotte; Hammerhead flatworms (Platyhelminthes, Geoplanidae, Bipaliinae): mitochondrial genomes and description of two new species from France, Italy, and Mayotte; artículo científico publicado en 2022; 2022年學術文章; tudományos cikk; artigo científico; 2022年学术文章; artículu científicu; научная статья; գիտական հոդված; wissenschaftlicher Artikel; سائنسی مضمون; artikull shkencor; научни чланак; научна статия; videnskabelig artikel (udgivet 2022); bilimsel makale; 2022年の論文; vedecký článok; наукова стаття; vetenskaplig artikel; article científic; מאמר מדעי; სამეცნიერო სტატია; мақолаи илмӣ; 2022年学术文章; 2022年学术文章; 2022년 논문; мақолаи илмӣ; scienca artikolo; vědecký článek; maqolai ilmiy; articolo scientifico; ২০২২-এ প্রকাশিত বৈজ্ঞানিক নিবন্ধ; article scientifique (2022); wetenschappelijk artikel; 2022年學術文章; artykuł naukowy; 2022年学术文章; vitskapeleg artikkel; artikel ilmiah; artigo científico (publicado na 2022); مقالهٔ علمی; bài báo khoa học; tieteellinen artikkeli; article scientific; научни чланак; mokslinis straipsnis; articol științific; artikulong pang-agham; artigo científico (publicado na 2022); 2022年学术文章; บทความทางวิทยาศาสตร์; 2022 nî lūn-bûn; vitenskapelig artikkel; 2022年學術文章; 2022年學術文章; 2022年學術文章; naučni članak; teaduslik artikkel; scientific article; مقالة علمية; επιστημονικό άρθρο; 2022年學術文章</nowiki>
Hammerhead flatworms (Platyhelminthes, Geoplanidae, Bipaliinae): mitochondrial genomes and description of two new species from France, Italy, and Mayotte 
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  • Jean-Lou Justine (1)
  • Romain Gastineau (2)
  • Delphine Gey (4)
  • Enrico Ruzzier (5)
  • Leigh Winsor (7)
  • Laurent Charles (6)
  • Pierre Gros (3)
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  • 1 February 2022
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Abstract
Background New records of alien land planarians are regularly reported worldwide, and some correspond to undescribed species of unknown geographic origin. The description of new species of land planarians (Geoplanidae) should classically be based on both external morphology and histology of anatomical structures, especially the copulatory organs, ideally with the addition of molecular data.

Methods Here, we describe the morphology and reproductive anatomy of a species previously reported as Diversibipalium “black”, and the morphology of a species previously reported as Diversibipalium “blue”. Based on next generation sequencing, we obtained the complete mitogenome of five species of Bipaliinae, including these two species.

Results The new species Humbertium covidum n. sp. (syn: Diversibipalium “black” of Justine et al., 2018) is formally described on the basis of morphology, histology and mitogenome, and is assigned to Humbertium on the basis of its reproductive anatomy. The type-locality is Casier, Italy, and other localities are in the Department of Pyrénées-Atlantiques, France; some published or unpublished records suggest that this species might also be present in Russia, China, and Japan. The mitogenomic polymorphism of two geographically distinct specimens (Italy vs France) is described; the cox1 gene displayed 2.25% difference. The new species Diversibipalium mayottensis n. sp. (syn: Diversibipalium “blue” of Justine et al., 2018) is formally described on the basis of external morphology and complete mitogenome and is assigned to Diversibipalium on the basis of an absence of information on its reproductive anatomy. The type- and only known locality is the island of Mayotte in the Mozambique Channel off Africa. Phylogenies of bipaliine geoplanids were constructed on the basis of SSU, LSU, mitochondrial proteins and concatenated sequences of cox1, SSU and LSU. In all four phylogenies, D. mayottensis was the sister-group to all the other bipaliines. With the exception of D. multilineatum which could not be circularised, the complete mitogenomes of B. kewense, B. vagum, B. adventitium, H. covidum and D. mayottensis were colinear. The 16S gene in all bipaliine species was problematic because usual tools were unable to locate its exact position.

Conclusion Next generation sequencing, which can provide complete mitochondrial genomes as well as traditionally used genes such as SSU, LSU and cox1, is a powerful tool for delineating and describing species of Bipaliinae when the reproductive structure cannot be studied, which is sometimes the case of asexually reproducing invasive species. The unexpected position of the new species D. mayottensis as sister-group to all other Bipaliinae in all phylogenetic analyses suggests that the species could belong to a new genus, yet to be described.

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