Evidence for a clade composed of molluscs with serially repeated structures: Monoplacophorans are related to chitons

Giribet, Gonzalo; Okusu, Akiko; Lindgren, Annie R.; Huff, Stephanie W.; Schrödl, Michael; Nishiguchi, Michele K.

doi:10.1073/pnas.0602578103

Cited by 196 publications

(128 citation statements)

References 36 publications

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“…As pointed out by Haszprunar (2008), the Monoplacophora have yet to be subjected to a rigorous cladistic analysis, and the limited molecular data currently available produce an unexpected outcome, with the monoplacophorans residing within the polyplacophorans (Giribet et al 2006). Most morphological analyses place the Monoplacophora at or near the base of the conchiferan clade [=monoplacophorans, bivalves, gastropods, scaphopods, and cephalopods] (Wingstrand 1985;Runnegar 1996;Salvini-Plawen and Steiner 1996;Waller 1998;Haszprunar 2000;Haszprunar et al 2008).…”

Section: Monoplacophorans As Living Fossilsmentioning

confidence: 99%

Monoplacophorans and the Origin and Relationships of Mollusks

Lindberg

2009

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The story of the discovery and study of the Monoplacophora (or Tryblidia) and how they have contributed to our understanding of the evolution of the Mollusca highlights the importance of integrating data from the fossil record with the study of living forms. Monoplacophora were common in the early Paleozoic and were thought to have become extinct during the Devonian Period, approximately 375 Mya. In the mid 1950s, they were recovered from abyssal depths off of Costa Rica and were immediately heralded as a "living fossil." The living specimens confirmed that some of the organs (kidneys, heart, and gills) were repeated serially, just like the shell muscles that had been observed in fossil specimens. This supported the hypothesis that they were closely related to other segmented organisms such as annelids and arthropods. Today, there are 29 described living species and a growing body of work examining their anatomy, phylogeny, and ecology. Additional fossil specimens have also been discovered, and what was once thought to be a possible missing link between annelid worms and mollusks now appears to be a highly specialized branch of the molluscan tree that tells us little about the ancestral mollusk condition. However, some assumptions and generalizations from those early days still remain-such as the abyssal nature of the living species. A large part of the evolutionary history of the lineage remains to be discovered and will likely prove more complicated and interesting than afforded by the living fossil designation.

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Section: Monoplacophorans As Living Fossilsmentioning

confidence: 99%

Monoplacophorans and the Origin and Relationships of Mollusks

Lindberg

2009

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“…The colors in the figure follow the convention used by González et al (2015). Bootstrap support values were 100% for all nodes, with the exception of the few for which the actual value is shown in the picture Van Doninck, 2013) and lrn (DQ280038, KP052744, DQ333747: Giribet et al, 2006;Van der Velde et al, 2010) genes of D. polymorpha present in GenBank perfectly match the respective fragment of this genome, confirming its identity. BLAST searches with all annotated D. polymorpha mitochondrial genes against RefSeq database pointed at the mitogenome belonging to M. arenaria as the closest one.…”

Section: Mitogenome Datamentioning

confidence: 68%

Next-generation sequencing of Dreissena polymorpha transcriptome sheds light on its mitochondrial DNA

et al. 2017

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Zebra mussels Dreissena polymorpha (Veneroida, Dreissenidae) are known for their invasive behavior. Despite numerous studies dealing with this species, no results of large sequencing projects have been published to date, hampering marker development. In this study, we present a relatively large novel transcriptomic dataset obtained by Illumina MiSeq technology from mantle and male gonad of D. polymorpha sampled in Poland. The transcriptomic data were typical for the tissue analyzed. Moreover, they showed the expression of a single mitochondrial genome, indicating that this species do not have doubly uniparental inheritance of mitochondria. The sequences of mitochondrial transcripts were used to design primers and obtain nearly complete sequence of the zebra mussel mitochondrial genome by PCR and Sanger sequencing. This mitogenome has unique gene order, with the genes split into two blocks encoded in opposite directions. The closest mitogenome available in GenBank belongs to the marine clam Mya arenaria (Myoida, Myidae). The average divergence of the sequences of these mitogenomes is quite high, in the range of 20%. Both mitogenomic and transcriptomic resources should prove very useful for elucidating population genetics and conservation issues involving this important species.

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“…For a comparative genetic analysis, we selected and downloaded sequences of Nacellidae and Patellidae from Boldsystems.org and NCBI.nlm.nih.gov based on previous studies (Sá-Pinto et al 2005;Giribet et al 2006;Nakano and Ozawa 2007;Sá-Pinto et al 2008;de Aranzamendi et al 2009;Nakano et al 2009;Gonzalez-Wevar et al 2010;Nakano et al 2010;Sá-Pinto et al 2010;Espinosa et al 2011;Gonzalez-Wevar et al 2011;Sanna et al 2011;Munoz-Colmenero et al 2012;Sá-Pinto et al 2012;Dong et al 2012;Kim et al 2012;Nakano and Espinosa 2013;Lin et al 2015) (Additional file 1). We did not change any of the taxa names in the downloaded sequence data.…”

Section: Identification and Dna Barcodingmentioning

confidence: 99%

New observations of the enigmatic West African Cellana limpet (Mollusca: Gastropoda: Nacellidae)

2016

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Background: Identification of limpets is often hampered by highly variable within-species shell morphologies and colour patterns. Since pre-Linnean times this has produced complex taxonomies with confusing nomenclatorial histories and uncertain distribution patterns. This is the case for a complex of taxa associated with Cymbula safiana (Lamarck, 1819) and with the rejected name Patella nigra. We DNA sequenced limpets from Nigeria that were originally identified as C. safiana. Comparisons with available cox1 data of patellogastropods show that the specimens actually belong to the genus Cellana Adams, 1869 which has been recorded only once before in the Atlantic Ocean with the finding of specimens from Ghana. Results: We are reporting findings of Cellana sp. from the Gulf of Guinea for the second time. Specimens from Nigeria are 100 % similar to previously published cox1 sequences from Ghana. Due to variable shell characteristics we suspect that this species may have been confused with Cymbula safiana (Lamarck, 1819) in previous records. Inspection of the radula sack and radula demonstrates clear similarities with other Cellana species and contrasting differences in the organization of the teeth in Cymbula. Conclusions: Because Cellana is a possible candidate of invasive species in West Africa and Cymbula is considered as endangered, is seems particularly important to be able to distinguish between the two without being dependent on DNA analysis. When shell morphology seems to be of questionable diagnostic value, examination of the radula will help in future mapping and monitoring of these two species. A cox1 gene tree with Nigerian sequences included is in line with findings of previous authors and restates the need for taxonomic revision of the species clustering with Cellana toreuma (Reeve, 1854) and parts of a polyphyletic Cellana radiata von Born, 1778.

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Evidence for a clade composed of molluscs with serially repeated structures: Monoplacophorans are related to chitons

Cited by 196 publications

References 36 publications

Monoplacophorans and the Origin and Relationships of Mollusks

Monoplacophorans and the Origin and Relationships of Mollusks

Next-generation sequencing of Dreissena polymorpha transcriptome sheds light on its mitochondrial DNA

New observations of the enigmatic West African Cellana limpet (Mollusca: Gastropoda: Nacellidae)

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