Micromenia amphiatlantica sp. nov.: First solenogaster (Mollusca, Aplacophora) with an amphi-Atlantic distribution and insight into abyssal solenogaster diversity

Cobo, M. Carmen; Kocot, Kevin M.

doi:10.1016/j.dsr.2019.103189

Cited by 4 publications

(6 citation statements)

References 51 publications

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“…(2022) and stained using a combination of Weigert Hematoxylin and Gomori’s Trichrome. All others were sectioned following the protocol from Cobo and Kocot (2020) that is based on Gil-Mansilla et al . (2008 b ) and uses Mallory’s trichrome stain.…”

Section: Methodsmentioning

confidence: 99%

“…Sections were photographed with an iPhone 11 using a PhoneSkope smartphone optics adapter. In addition, histology (following the protocol described in Cobo and Kocot 2020) of the anterior and posterior regions of six additional Proneomeniidae specimens included in the phylogenetic analysis (Table 1) was conducted. For three of these specimens, decalcification of the mantle sclerites was undertaken using hydrochloric acid instead of EDTA.…”

Section: Methodsmentioning

confidence: 99%

“…2017, 2019; Zamarro et al . 2019; Cobo and Kocot 2020) from where most of the existing species are considered to be new to science (Mora et al . 2011; M. C. Cobo and K. M. Kocot, pers.…”

Section: Introductionmentioning

confidence: 99%

“…Kocot and Todt 2014;Pedrouzo et al 2014), most species discovered in recent years come from remote or unexplored localities (e.g. Gil-Mansilla et al 2008aBergmeier et al 2017Bergmeier et al , 2019Zamarro et al 2019;Cobo and Kocot 2020) from where most of the existing species are considered to be new to science (Mora et al 2011; M. C. Cobo and K. M. Kocot, pers. obs.…”

Section: Introductionmentioning

confidence: 99%

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Four new Solenogastres (Mollusca, Aplacophora) from the South China Sea and paraphyly of Proneomeniidae Simroth, 1893

Cobo,

McLaughlin,

Kocot

2023

Invertebr. Syst.

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Solenogastres and Caudofoveata (Aplacophora) remain some of the least known molluscs, despite ubiquity in the marine environment and importance in understanding molluscan evolution. The use of new morphological techniques and development of DNA barcode libraries have helped make specimen identification easier. However, for solenogasters, using histology for identification and adequate description of species remains necessary in most cases. This, together with the facts that knowledge about solenogaster species distributions is biased and that most species were described from one or very few individuals, explains why many open questions about the actual distribution, intra- and interspecific variability, etc., remain. We performed an integrative taxonomic study of eight specimens of solenogasters from the South China Sea (West Pacific Ocean) thatresulted in the identification of four new species of Proneomeniidae. Species identification and description following the established diagnostic characters were straightforward. However, phylogenetic analysis of molecular data obtained from these specimens and other members of Proneomeniidae indicate that the family is polyphyletic. We recovered representatives of two other families, Epimeniidae (Epimenia) and Strophomeniidae (Anamenia), nested within Proneomeniidae with strong support. Ancestral character state reconstruction indicates that characters commonly used in solenogaster taxonomy, such as the radula and foregut glands, may be more evolutionarily labile in this group than previously known. Therefore our work fills knowledge gaps regarding the diversity and distribution of members of this family but raises important questions about solenogaster taxonomy and systematics that should be further assessed with additional markers and broader taxon sampling. ZooBank: urn:lsid:zoobank.org:pub:BCADACD6-9AD0-442A-AD64-031BA8D88599

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…2017, 2019; Zamarro et al . 2019; Cobo and Kocot 2020) from where most of the existing species are considered to be new to science (Mora et al . 2011; M. C. Cobo and K. M. Kocot, pers.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Four new Solenogastres (Mollusca, Aplacophora) from the South China Sea and paraphyly of Proneomeniidae Simroth, 1893

Cobo,

McLaughlin,

Kocot

2023

Invertebr. Syst.

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“…Ubiquitous among the deep-sea organisms, aplacophorans form a molluscan group of particular phylogenetic interest (e.g., Kocot et al, 2011;Smith et al, 2011;Vinther et al, 2012Vinther et al, , 2017Mikkelsen et al, 2018Mikkelsen et al, , 2019, ecological importance (Scheltema, 1987(Scheltema, , 1997Scheltema and Ivanov, 2009), and biogeographical relevance (Scheltema, 1985;Ivanov and Scheltema, 2008;Corrêa et al, 2014Corrêa et al, , 2018Bergmeier et al, 2017Bergmeier et al, , 2019Cobo and Kocot, 2020). They are generally characterized by their wormlike bodies covered by sclerites, and formed by two clades: Solenogastres, which are epifaunal and bear a ventral pedal furrow, and Caudofoveata, whose species are infaunal, without a ventral locomotory organ, and have an oral shield (that is absent in solenogasters).…”

Section: Introductionmentioning

confidence: 99%

Better Alone Than in Bad Company: New Species of Caudofoveate Limifossorid (Mollusca, Aplacophora) Unravels Patterns of Distribution Hidden in the Deep Atlantic

Passos

Corrêa²,

Miranda

2021

Front. Mar. Sci.

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Aplacophorans are common inhabitants of the deep-sea, where many places remain unexplored regarding their biodiversity. Filling a gap in knowledge about these animals from the South Atlantic, Scutopus variabilis sp. nov. (Caudofoveata, Limifossoridae) is described; further, species distribution modelling (SDM) was performed to elucidate the distribution patterns of Atlantic species of Scutopus. The type materials of S. megaradulatusSalvini-Plawen (1972) and S. chilensisSalvini-Plawen (1972), were examined and a search was performed for specimens of Scutopus held in museum collections. Scutopus variabilis sp. nov. has a slender and highly variable body form and a very distinct suture line is present midventrally. Two dominant types of trunk sclerites were observed by Scanning Electron Microscopy (SEM): one elongated with lateral margins slightly concave in medial portion, and another longer, with narrower base; its radula bears up to eight rows of heavily sclerotized teeth bearing 12–16 small denticles. The species occurs in a wide bathymetric range (40–1300 m), being more abundant at the edge between the continental shelf and upper slope. Outside the areas from where these samples were obtained, suitable areas for S. variabilis sp. nov. were found in the Southern Caribbean Sea (from where S. megaradulatus is recorded) and in the Brazilian Northern coast; the Gulf of Mexico and the Brazilian Northeastern coasts were found as unsuitable. Species of Scutopus appear to exhibit different patterns of geographical distribution: the European S. ventrolineatusSalvini-Plawen (1968) and S. robustusSalvini-Plawen (1970) are known as widely distributed, while non-European representants, the American S. megaradulatus, S. chilensis and S. variabilis sp. nov., and the Japanese S. schanderiSaito and Salvini-Plawen (2014) and S. hamatamiiSaito and Salvini-Plawen (2014) have more restricted distributions. However, clear and definite patterns of distribution of some of these species are probably blurred by sampling bias, for the European area is better studied. In the Atlantic, the SDM showed that species of Scutopus occur in a way that overlapping is minimized. Great sampling efforts combined with detailed descriptions based on SEM have revealed an interesting, abundant and up to now undescribed Brazilian deep-sea malacofauna.

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A chromosome-level genome assembly of a deep-sea symbiotic Aplacophora mollusc Chaetoderma sp.

Wang,

et al. 2024

Sci Data

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The worm-shaped, shell-less Caudofoveata is one of the least known groups of molluscs. As early-branching molluscs, the lack of high-quality genomes hinders our understanding of their evolution and ecology. Here, we report a high-quality chromosome-scale genome of Chaetoderma sp. combining PacBio, Illumina, and high-resolution chromosome conformation capture sequencing. The final assembly has a size of 2.45 Gb, with a scaffold N50 length of 141.46 Mb, and is anchored to 17 chromosomes. Gene annotations showed a high level of accuracy and completeness, with 23,675 predicted protein-coding genes and 94.44% of the metazoan conserved genes by BUSCO assessment. We further present 16S rRNA gene amplicon sequencing of the gut microbiota in Chaetoderma sp., which was dominated by the chemoautotrophic bacteria (phylum Gammaproteobacteria). This chromosome-level genome assembly presents the first genome for the Caudofoveata, which constitutes an important resource for studies ranging from molluscan evolution, symposium, to deep-sea adaptation.

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Micromenia amphiatlantica sp. nov.: First solenogaster (Mollusca, Aplacophora) with an amphi-Atlantic distribution and insight into abyssal solenogaster diversity

Cited by 4 publications

References 51 publications

Four new Solenogastres (Mollusca, Aplacophora) from the South China Sea and paraphyly of Proneomeniidae Simroth, 1893

Four new Solenogastres (Mollusca, Aplacophora) from the South China Sea and paraphyly of Proneomeniidae Simroth, 1893

Better Alone Than in Bad Company: New Species of Caudofoveate Limifossorid (Mollusca, Aplacophora) Unravels Patterns of Distribution Hidden in the Deep Atlantic

A chromosome-level genome assembly of a deep-sea symbiotic Aplacophora mollusc Chaetoderma sp.

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