Nemerteans collected in the Bering Sea during the research cruises aboard the R/V Akademik M.A. Lavrentyev in 2016, 2018, and 2021 with an analysis of deep-sea heteronemertean and hoplonemertean species

Chеrnyshev, Alexei V.; Polyakova, N. E.

doi:10.1016/j.dsr2.2022.105081

Cited by 13 publications

(14 citation statements)

References 53 publications

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“…Their interspecific genetic distances based on COI were 1.6-4.4% in uncorrected pdistance and (Table S2), lower than interspecific COI divergences previously reported in Nipponnemertes (3.8-4.3% between N. pulchra and N. cf. rubella) (Chernyshev & Polyakova, 2022) and other nemerteans (Sundberg et al, 2016). The most conspicuous case was observed between N. crypta and N. ojimaorum showing 1.6% in p-distance, albeit apparently different body coloration (Figures 4C, D, I-K) (similar phenomena have been found in other invertebrates such as bobtail squids (Fernańdez-A ́lvarez et al, 2021) and mites (Garcıá-Jimeńez et al, 2017).…”

Section: Molecular Systematics Of Nipponnemertessupporting

confidence: 74%

“…1 and Nipponnemertes sp. DNA105622 (Andrade et al, 2012) from California constituted a clade supported by 99% of bootstrap value (BS); between the two species, the genetic distances based on COI were 3.4% in uncorrected p-distance (Table S1), smaller than interspecific genetic distances previously reported in Nipponnemertes (Chernyshev & Polyakova, 2022).…”

Section: Phylogenetic Relationships Among Nipponnemertesmentioning

confidence: 86%

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Molecular Phylogeny of the Genus Nipponnemertes (Nemertea: Monostilifera: Cratenemertidae) and Descriptions of 10 New Species, With Notes on Small Body Size in a Newly Discovered Clade

et al. 2022

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Nemerteans, or ribbon worms, have been reported from intertidal to hadal depths, often showing bathymetrically wide distribution in genus levels. Although current nemertean systematics practices require to provide DNA sequences and infer phylogenetic relationships with suitable molecular markers, previous molecular systematics on nemerteans are mostly biased toward shallow-water species. Members in the genus Nipponnemertes occur worldwide, from tropical to polar waters and intertidal to bathyal waters. Molecular phylogenetic studies are scarce for the genus; only six shallow-water species of 18 species in the genus were subject to molecular phylogeny. Thus, Nipponnemertes is one candidate that needs to be assessed by genetic approaches. In this study, we performed molecular phylogenetic analyses using 59 specimens in 23 species based on partial sequences of two mitochondrial (16S rRNA and cytochrome c oxidase subunit I) and three nuclear gene markers (18S rRNA, 28S rRNA, and histone H3). Our extensive sampling from intertidal to bathyal waters in the Northwest Pacific significantly updated the fauna of Nipponnemertes in this region from four to 17 species. We herein establish 10 new species and provide an updated species list concisely summarizing all the congeners known from the world. Our phylogenetic tree indicated three major lineages within the genus (herein referred to as “Clade A, B, and C”), each presumably characterized by the combination of morphological characters in the head region. Members in Clade A are: Nipponnemertes pulchra (Johnston, 1837), Nipponnemertes ogumai (Yamaoka, 1947), and several unidentified congeners, characterized by having demarcated head without cephalic patches; members in Clade B are: Nipponnemertes crypta sp. nov., Nipponnemertes jambio sp. nov., Nipponnemertes neonilae sp. nov., and Nipponnemertes ojimaorum sp. nov., species having demarcated head with cephalic patches; members in Clade C are: Nipponnemertes ganahai sp. nov., Nipponnemertes kozaensis sp. nov., Nipponnemertes lactea sp. nov., Nipponnemertes notoensis sp. nov., Nipponnemertes ornata sp. nov., Nipponnemertes sugashimaensis sp. nov., and two unidentified forms collected off Jogashima (Japan) and Guam (USA), species with non-demarcated head lacking cephalic patches. Furthermore, we discuss the evolution of remarkably small body size retained among Clade C.

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Section: Molecular Systematics Of Nipponnemertessupporting

confidence: 74%

Section: Phylogenetic Relationships Among Nipponnemertesmentioning

confidence: 86%

Molecular Phylogeny of the Genus Nipponnemertes (Nemertea: Monostilifera: Cratenemertidae) and Descriptions of 10 New Species, With Notes on Small Body Size in a Newly Discovered Clade

et al. 2022

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“…The nemertean species were identified by sequencing the cytochrome c oxidase subunit I (COI) gene according to the protocol described by Chernyshev and Polyakova [ 48 ] (see Supplementary Materials ). Amplification of polymerase chain reaction (PCR) was carried out using the Folmer’s primers [ 49 ].…”

Section: Methodsmentioning

confidence: 99%

Tetrodotoxins in Tissues and Cells of Different Body Regions of Ribbon Worms Kulikovia alborostrata and K. manchenkoi from Spokoynaya Bay, Sea of Japan

Vlasenko,

Pereverzeva,

Velansky

et al. 2024

Toxins

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Nemerteans, or ribbon worms, possess tetrodotoxin and its analogues (TTXs), neurotoxins of bacterial origin, which they presumably use for capturing prey and self-defense. Most TTXs-containing nemertean species have low levels of these toxins and, therefore, have usually been neglected in studies of TTXs functions and accumulation. In the present study, Kulikovia alborostrata and K. manchenkoi, two closely related species, were analyzed for TTXs distribution in the body using the HPLC–MS/MS and fluorescence microscopy methods. The abundance of TTXs-positive cells was determined in the proboscis, integument, and digestive system epithelium. As a result, six TTXs-positive cell types were identified in each species; however, only four were common. Moreover, the proportions of the toxins in different body parts were estimated. According to the HPLC–MS/MS analysis, the TTXs concentrations in K. alborostrata varied from 0.91 ng/g in the proboscis to 5.52 ng/g in the precerebral region; in K. manchenkoi, the concentrations ranged from 7.47 ng/g in the proboscis to 72.32 ng/g in the posterior body region. The differences observed between the two nemerteans in the distribution of the TTXs were consistent with the differences in the localization of TTXs-positive cells. In addition, TTXs-positive glandular cell types were found in the intestine and characterized for the first time. TTXs in the new cell types were assumed to play a unique physiological role for nemerteans.

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“…2). A closely related species is reported by Chernyshev and Polyakova (2022) from the Bering Sea as Evelineus sp., but there is no mention of its appearance, and it has only been encountered at depths 350 m and below. COI sequences suggest that Bodega Bay specimens are conspecific (97-99% similarity COI) with M. verrilli reported from Bamfield, BC, Canada (EF125007), Puget Sound, Washington (KF935508), and Charleston, Oregon (Maslakova et al 2022: OTU 65).…”

Section: Bin Bold:adw4746mentioning

confidence: 99%

Figure 3 from: Ellison CI, Frey MR, Sanford E, Maslakova S (2024) Ribbon worms (phylum Nemertea) from Bodega Bay, California: A largely undescribed diversity. ZooKeys 1204: 15-64. https://doi.org/10.3897/zookeys.1204.117869

Ellison,

Frey,

Sanford

et al. 2024

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Nemerteans collected in the Bering Sea during the research cruises aboard the R/V Akademik M.A. Lavrentyev in 2016, 2018, and 2021 with an analysis of deep-sea heteronemertean and hoplonemertean species

Cited by 13 publications

References 53 publications

Molecular Phylogeny of the Genus Nipponnemertes (Nemertea: Monostilifera: Cratenemertidae) and Descriptions of 10 New Species, With Notes on Small Body Size in a Newly Discovered Clade

Molecular Phylogeny of the Genus Nipponnemertes (Nemertea: Monostilifera: Cratenemertidae) and Descriptions of 10 New Species, With Notes on Small Body Size in a Newly Discovered Clade

Tetrodotoxins in Tissues and Cells of Different Body Regions of Ribbon Worms Kulikovia alborostrata and K. manchenkoi from Spokoynaya Bay, Sea of Japan

Figure 3 from: Ellison CI, Frey MR, Sanford E, Maslakova S (2024) Ribbon worms (phylum Nemertea) from Bodega Bay, California: A largely undescribed diversity. ZooKeys 1204: 15-64. https://doi.org/10.3897/zookeys.1204.117869

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