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Journal articles on the topic 'Monoplacophora'

Author: Grafiati

Published: 4 June 2021

Last updated: 28 July 2025

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1

SCHWABE, ENRICO. "A summary of reports of abyssal and hadal Monoplacophora and Polyplacophora (Mollusca)." Zootaxa 1866, no. 1 (2008): 205. http://dx.doi.org/10.11646/zootaxa.1866.1.10.

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A summary of literature records of Polyplacophora and Monoplacophora from below 2000 m is presented. Reports have been published of 11 described species of monoplacophorans and twice as many polyplacophorans from abyssal and hadal depths. Additionally taken into account are several records of deep water species of uncertain taxonomic position in both classes. Occurrence and geographic distribution are briefly discussed.

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2

Stinchcomb, Bruce L., and Guy Darrough. "Some molluscan problematica from the Upper Cambrian–Lower Ordovician of the Ozark uplift." Journal of Paleontology 69, no. 1 (1995): 52–65. http://dx.doi.org/10.1017/s0022336000026913.

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The mollusk Hemithecella, which occurs abundantly both above and below the Cambrian-Ordovician boundary in the Ozark region of Missouri, is discussed and compared with Matthevia and with the polyplacophoran order Paleoloricata and found to be distinctly different. Based upon the presence of monoplacophoran-like multiple muscle scars and asymmetrical valves, Hemithecella and related forms described here are considered to be molluscan problematica. Hemithecellids are mollusks; however, their affinity to other classes is unclear although structural similarities to the Monoplacophora are noted. Th

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3

Stinchcomb, Bruce L. "New Monoplacophora (Mollusca) from Late Cambrian and Early Ordovician of Missouri." Journal of Paleontology 60, no. 3 (1986): 606–26. http://dx.doi.org/10.1017/s0022336000022149.

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Fourteen new species and six new genera of the molluscan class Monoplacophora are described from the Upper Cambrian Potosi and Eminence formations and the Lower Ordovician Gasconade Formation of the Ozark Uplift of Missouri and some new biostratigraphic horizons are introduced. A new superfamily, the Hypseloconellacea nom. trans. Knight, 1956, and a new family, the Shelbyoceridae, are named. The genus Proplina is represented by five new species: P. inflatus, P. suttoni from the Cambrian Potosi Formation, P. arcua from the Cambrian Eminence Formation and P. meramecensis and P. sibeliusi from th

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4

Haszprunar, Gerhard, and Bernhard Ruthensteiner. "Monoplacophora (Tryblidia)—Some Unanswered Questions*." American Malacological Bulletin 31, no. 1 (2013): 189–94. http://dx.doi.org/10.4003/006.031.0111.

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5

Schwabe, Enrico. "A summary of reports of abyssal and hadal Monoplacophora and Polyplacophora (Mollusca) *." Zootaxa 1866 (December 31, 2008): 205–22. https://doi.org/10.5281/zenodo.183815.

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6

Ampuero, Andre, and Julia D. Sigwart. "Inside out Monoplacophora: revisiting Neopilina galatheae Lemche, 1957 using µCT scanning." Zoological Journal of the Linnean Society 203, no. 1 (2025): 1–7. https://doi.org/10.1093/zoolinnean/zlae168.

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Ampuero, Andre, Sigwart, Julia D. (2025): Inside out Monoplacophora: revisiting Neopilina galatheae Lemche, 1957 using µCT scanning. Zoological Journal of the Linnean Society 203 (1): 1-7, DOI: 10.1093/zoolinnean/zlae168, URL: https://doi.org/10.1093/zoolinnean/zlae168

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7

Kano, Yasunori, Shoichi Kimura, Taeko Kimura, and Anders Warén. "Living Monoplacophora: morphological conservatism or recent diversification?" Zoologica Scripta 41, no. 5 (2012): 471–88. http://dx.doi.org/10.1111/j.1463-6409.2012.00550.x.

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8

Giusti, Francesco, and Pasquale Micali. "First Mediterranean record of Micropilina minuta Warén, 1989 (Monoplacophora: Neopilinidae)." Bollettino Malacologico 58, no. 1 (2022): 14–17. http://dx.doi.org/10.53559/bollmalacol.2021.21.

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The lilliputian and elusive monoplacophoran Micropilina minuta Warén, 1989 is recorded for the first time from the Mediterranean basin upon various records of empty shells trawled between 270 and 700 m in the Tuscan Archipelago (northern Tyrrhenian Sea). Our data reveal that Micropilina minuta often co-occurs with the only other monoplacophoran previously recorded in the Mediterranean, Veleropilina reticulata (Seguenza G., 1876).Micropilina minuta Warén, originally described on material from Iceland, was later found in the lower Pleistocene of Archi (Reggio Calabria, Italy). Although some shel

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9

Ruthensteiner, B., V. Schropel, and G. Haszprunar. "Anatomy and affinities of Micropilina minuta Waren, 1989 (Monoplacophora: Micropilinidae)." Journal of Molluscan Studies 76, no. 4 (2010): 323–32. http://dx.doi.org/10.1093/mollus/eyq013.

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10

Haszprunar, Gerhard, and Kurt Schaefer. "Anatomy and Phylogenetic Significance ofMicropilina arntzi(Mollusca, Monoplacophora, Micropilinidae Fam. Nov.)." Acta Zoologica 77, no. 4 (1996): 315–34. http://dx.doi.org/10.1111/j.1463-6395.1996.tb01276.x.

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11

Wilson, Nerida G., Greg W. Rouse, and Gonzalo Giribet. "Assessing the molluscan hypothesis Serialia (Monoplacophora+Polyplacophora) using novel molecular data." Molecular Phylogenetics and Evolution 54, no. 1 (2010): 187–93. http://dx.doi.org/10.1016/j.ympev.2009.07.028.

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12

Pimenta, Alexandre Dias. "THE MOLLUSCA COLLECTION OF THE MUSEU NACIONAL / UFRJ – HISTORICAL SYNTHESIS." Arquivos de Ciências do Mar 49 (February 13, 2017): 54. http://dx.doi.org/10.32360/acmar.v49i0.6134.

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A Coleção de Mollusca do Museu Nacional/UFRJ é a mais antigs antiga e uma das maiores no Brasil. Atualmente, ela inclui 39.631 lotes registrados de todas as classes do filo, exceto Monoplacophora, além de muitos outros em processo de tombamento. A maioria dos lotes provêm de localidades no Brasil, mas espécies de localidades no exterior também estão representadas. Espécies marinhas são as mais representativas, mas espécies de ambientes terrestre e límnico também estão depositadas, assim como material de sítios de Sambaqui. A coleção abriga 671 lotes de tipos, de 347 nomes, sendo 132 holótipos

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13

Stöger, I., J. D. Sigwart, Y. Kano, et al. "The Continuing Debate on Deep Molluscan Phylogeny: Evidence for Serialia (Mollusca, Monoplacophora + Polyplacophora)." BioMed Research International 2013 (2013): 1–18. http://dx.doi.org/10.1155/2013/407072.

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Molluscs are a diverse animal phylum with a formidable fossil record. Although there is little doubt about the monophyly of the eight extant classes, relationships between these groups are controversial. We analysed a comprehensive multilocus molecular data set for molluscs, the first to include multiple species from all classes, including five monoplacophorans in both extant families. Our analyses of five markers resolve two major clades: the first includes gastropods and bivalves sister to Serialia (monoplacophorans and chitons), and the second comprises scaphopods sister to aplacophorans an

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14

Webers, Gerald F., and Ellis L. Yochelson. "A revision of Palaeacmaea (Upper Cambrian) (?Cnidaria)." Journal of Paleontology 73, no. 4 (1999): 598–607. http://dx.doi.org/10.1017/s002233600003242x.

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Palaeacmaea typica, the type species of the genus, and P. irvingi, the only other Late Cambrian taxon considered congeneric are redescribed herein. Their morphology suggests that they are neither Monoplacophora, where they are currently assigned, nor are they Mollusca. Specimens of P. irvingi demonstrate considerable variation in shape, interpreted as distortion of a flexible integument, of essentially no thickness. A neotype is designated for P. irvingi; it is interpreted as a medusiform fossil, possibly a cnidarian. Only the holotype of P. typica is known, but it shows comparable features. T

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15

Lindberg, David R. "Aplacophorans, Monoplacophorans, Polyplacophorans, Scaphopods: the Lesser Classes." Notes for a Short Course: Studies in Geology 13 (1985): 230–47. http://dx.doi.org/10.1017/s0271164800001202.

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The “primitive,” “minor” or “lesser” classes of the Mollusca comprise four groups that are typically recognized at the class level in most classification schemes. These classes are: (1) the Aplacophora, (2) the Monoplacophora, (3) the Polyplacophora, and (4) the Scaphopoda. Members of these classes are bilaterally symmetrical and typically possess a ventral muscular foot and a dorsal epidermal tissue (the mantle) that secretes a calcareous covering. Between these two structures lie the viscera. The space that develops between the mantle and the foot of the mollusc is referred to as the mantle

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16

Schrödl, Michael, Katrin Linse, and Enrico Schwabe. "Review on the distribution and biology of Antarctic Monoplacophora, with first abyssal record of Laevipilina antarctica." Polar Biology 29, no. 9 (2006): 721–27. http://dx.doi.org/10.1007/s00300-006-0132-7.

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17

URGORRI, V., and J. S. TRONCOSO. "A SECOND RECORD OF LAEVIPILINA ROLANI WARÉN & BOUCHET, 1990 (MOLLUSCA: MONOPLACOPHORA) FROM THE NORTHWEST OF SPAIN." Journal of Molluscan Studies 60, no. 2 (1994): 157–63. http://dx.doi.org/10.1093/mollus/60.2.157.

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18

Cruz, Renato, Gilberto Weissmüller, and Marcos Farina. "Microstructure of monoplacophora (mollusca) shell examined by low-voltage field emission scanning electron and atomic force microscopy." Scanning 25, no. 1 (2006): 12–18. http://dx.doi.org/10.1002/sca.4950250104.

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19

Moreau, Camille, Katrin Linse, Huw Griffiths, et al. "Amundsen Sea Mollusca from the BIOPEARL II expedition." ZooKeys 294 (April 22, 2013): 1–8. https://doi.org/10.3897/zookeys.294.4796.

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Information regarding the molluscs in this dataset is based on the epibenthic sledge (EBS) samples collected during the cruise BIOPEARL II / JR179 RRS James Clark Ross in the austral summer 2008. A total of 35 epibenthic sledge deployments have been performed at five locations in the Amundsen Sea at Pine Island Bay (PIB) and the Amundsen Sea Embayment (ASE) at depths ranging from 476 to 3501m. This presents a unique and important collection for the Antarctic benthic biodiversity assessment as the Amundsen Sea remains one of the least known regions in Antarctica. Indeed the work presented in th

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20

Männer, Lisa, Tilman Schell, Panagiotis Provataris, Martin Haase, and Carola Greve. "Inference of DNA methylation patterns in molluscs." Philosophical Transactions of the Royal Society B: Biological Sciences 376, no. 1825 (2021): 20200166. http://dx.doi.org/10.1098/rstb.2020.0166.

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Mollusca are the second largest and arguably most diverse phylum of the animal kingdom. This is in sharp contrast to our very limited knowledge concerning epigenetic mechanisms including DNA methylation in this invertebrate group. Here, we inferred DNA methylation patterns by analysing the normalized dinucleotide CG content in protein-coding sequences and identified DNA methyltransferases (DNMT1 and 3) in published transcriptomes and genomes of 140 species across all eight classes of molluscs. Given the evolutionary age and morphological diversity of molluscs, we expected to find evidence for

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21

Beu, Alan G. "The “inoceramus limpet”Gigantocapulus problematicus (Nagao & Otatume, 1938) in New Zealand (Late Cretaceous Gastropoda or Monoplacophora, Gigantocapulidae n. fam.)." Paläontologische Zeitschrift 81, no. 3 (2007): 267–82. http://dx.doi.org/10.1007/bf02990177.

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22

Ghiglione, Claudio, Maria Chiara Alvaro, Huw Griffiths, Katrin Linse, and Stefano Schiaparelli. "Ross Sea Mollusca from the Latitudinal Gradient Program: R/V Italica 2004 Rauschert dredge samples." ZooKeys 341 (October 7, 2013): 37–48. https://doi.org/10.3897/zookeys.341.6031.

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Information regarding the molluscs in this dataset is based on the Rauschert dredge samples collected during the Latitudinal Gradient Program (LGP) on board the R/V “<i>Italica</i>” in the Ross Sea (Antarctica) in the austral summer 2004. A total of 18 epibenthic dredge deployments/samplings have been performed at four different locations at depths ranging from 84 to 515m by using a Rauschert dredge with a mesh size of 500µm. In total 8,359 specimens have been collected belonging to a total of 161 species. Considering this dataset in terms of occurrences, it corresponds to 505 discrete distrib

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23

Fontoura-da-Silva, Vanessa, Renato Junqueira de Souza Dantas, and Carlos Henrique Soares Caetano. "FORAGING TACTICS IN MOLLUSCA: A REVIEW OF THE FEEDING BEHAVIOR OF THEIR MOST OBSCURE CLASSES (APLACOPHORA, POLYPLACOPHORA, MONOPLACOPHORA, SCAPHOPODA AND CEPHALOPODA)." Oecologia Australis 17, no. 3 (2013): 358–73. http://dx.doi.org/10.4257/oeco.2013.1703.04.

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24

WAREN, ANDERS, and SERGE GOFAS. "A new species of Monoplacophora, redescription of the genera Veleropilina and Rokopella, and new information on three species of the class." Zoologica Scripta 25, no. 3 (1996): 215–32. http://dx.doi.org/10.1111/j.1463-6409.1996.tb00163.x.

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25

Horný, Radvan J. "Patelliconus Horný, 1961 And Mytoconula Gen. N. (Mollusca, Tergomya) From The Ordovician Of Perunica." Acta Musei Nationalis Pragae Series B 65, no. 1-2 (2009): 25–36. https://doi.org/10.5281/zenodo.13183168.

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Horný, Radvan J. (2009): Patelliconus Horný, 1961 And Mytoconula Gen. N. (Mollusca, Tergomya) From The Ordovician Of Perunica. Acta Musei Nationalis Pragae Series B 65 (1-2): 25-36, DOI: 10.5281/zenodo.13183168

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26

Moskalev, L. I. "Deep-sea fauna of European seas: An annotated species check-list of benthic invertebrates living deeper than 2000 m in the seas bordering Europe. Monoplacophora." Invertebrate Zoology 11, no. 1 (2014): 181–82. http://dx.doi.org/10.15298/invertzool.11.1.16.

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27

Stinchcomb, Bruce L. "Change of monoplacophoran genus Protoconus to Proteroconus due to homonymy." Journal of Paleontology 70, no. 2 (1996): 339. http://dx.doi.org/10.1017/s0022336000023453.

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The monoplacophoran genus Protoconus Stinchcomb, 1986, from the Upper Cambrian of the Ozark Uplift of Missouri, is a junior homonym of the monoplacophoran Protoconus Yü, 1979. Protoconus is a significant element in the pre-trilobite Lowermost Cambrian (Meishucan) beds of China (Yü, 1987). In consideration of this homonymy, it is proposed that Protoconus Stinchcomb, 1986, is changed and designated as Proteroconus.

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28

FRÝDA, JIŘÍ, ROBERT B. BLODGETT, ALFRED C. LENZ, and BARBORA FRÝDOVÁ. "Jardamarekia enigma, a new Early Devonian tryblidioidean from Royal Creek area (Yukon Territory, Canada), and paleobiogeography of the Early Devonian of northwestern Canada." Zootaxa 2905, no. 1 (2011): 57. http://dx.doi.org/10.11646/zootaxa.2905.1.4.

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The Tryblidia (= Monoplacophora) represents the conchiferan class with the fewest Recent taxa in the phylum Mollusca (Haszprunar 2008) and its phylogeny is still poorly known. This group is known already in Cambrian strata (Early Paleozoic) more than 500 Ma ago. Present-day tryblidian species are known mainly from hadal environments (Schwabe 2008, but see also Wilson et al. 2009) in contrast to Paleozoic species, which have been described only from shallow environments of continental shelves of many paleocontinents (e.g., Horný 1962). A typical feature of fossil as well as living tryblidian sp

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29

Simone, Luiz Ricardo L. "Comparative morphology among representatives of main taxa of Scaphopoda and basal protobranch Bivalvia (Mollusca)." Papéis Avulsos de Zoologia 49, no. 32 (2009): 405–57. http://dx.doi.org/10.1590/s0031-10492009003200001.

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This study deals with detailed morphology and anatomy of 4 species of Scaphopoda and 5 species of protobranch Bivalvia. Both classes are traditionally grouped in the taxon Diasoma, which has been questioned by different methodologies, such as molecular and developmental. This study is developed under a phylogenetic methodology with the main concern in performing it in an intelligible and testable methodology. The analyzed Scaphopoda species came from the Brazilian coast and belong to the family Dentaliidae [(1) Coccodentalium carduus; (2) Paradentalium disparile] and Gadiliidae; [(3) Polyschid

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30

TAVIANI, MARCO, BRUNO SABELLI, and FRANCO CANDINI. "A fossil Cenozoic monoplacophoran." Lethaia 23, no. 2 (1990): 213–16. http://dx.doi.org/10.1111/j.1502-3931.1990.tb01361.x.

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31

Wiklund, Helena, John D. Taylor, Thomas G. Dahlgren, et al. "Abyssal fauna of the UK-1 polymetallic nodule exploration area, Clarion-Clipperton Zone, central Pacific Ocean: Mollusca." ZooKeys 707 (October 10, 2017): 1–46. https://doi.org/10.3897/zookeys.707.13042.

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We present the first DNA taxonomy publication on abyssal Mollusca from the Clarion-Clipperton Zone (CCZ), central Pacific ocean, using material collected as part of the Abyssal Baseline (ABYSSLINE) environmental survey cruise 'AB01' to the UK Seabed Resources Ltd (UKSRL) polymetallic-nodule exploration area 'UK-1' in the eastern CCZ. This is the third paper in a series to provide regional taxonomic data for a region that is undergoing intense deep-sea mineral exploration for high-grade polymetallic nodules. Taxonomic data are presented for 21 species from 42 records identified by a combination

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32

Marshall, Bruce A. "A new monoplacophoran (Mollusca) from southern New Zealand." Molluscan Research 19, no. 1 (1998): 53–58. http://dx.doi.org/10.1080/13235818.1998.10673707.

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33

Dzik, Jerzy. "Brachiopod Identity of the Alleged Monoplacophoran Ancestors of Cephalopods." Malacologia 52, no. 1 (2010): 97–113. http://dx.doi.org/10.4002/040.052.0107.

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34

WARÉN, ANDERS, and PHILIPPE BOUCHET. "LAEVIPILINA ROLANI, A NEW MONOPLACOPHORAN FROM OFF SOUTHWESTERN EUROPE." Journal of Molluscan Studies 56, no. 3 (1990): 449–53. http://dx.doi.org/10.1093/mollus/56.3.449.

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35

Bouchet, Philippe, Jean-Pierre Rocroi, Bernhard Hausdorf, et al. "Revised Classification, Nomenclator and Typification of Gastropod and Monoplacophoran Families." Malacologia 61, no. 1-2 (2017): 1–526. http://dx.doi.org/10.4002/040.061.0201.

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36

Schaefer, Kurt, and Gerhard Haszprunar. "Anatomy ofLaevipilina antarctica, a Monoplacophoran Limpet (Mollusca) from Antarctic Waters." Acta Zoologica 77, no. 4 (1996): 295–314. http://dx.doi.org/10.1111/j.1463-6395.1996.tb01275.x.

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37

Warén, Anders. "Neopilina goesi, A New Caribbean Monoplacophoran Mollusk Dredged In 1869." Proceedings of the Biological Society of Washington 101 (June 7, 1988): 676–81. https://doi.org/10.5281/zenodo.13668341.

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38

Lindberg, David R. "Monoplacophorans and the Origin and Relationships of Mollusks." Evolution: Education and Outreach 2, no. 2 (2009): 191–203. http://dx.doi.org/10.1007/s12052-009-0125-4.

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39

Stinchcomb, Bruce L., and Nicholas A. Angeli. "New Cambrian and Lower Ordovician monoplacophorans from the Ozark Uplift, Missouri." Journal of Paleontology 76, no. 6 (2002): 965–74. http://dx.doi.org/10.1017/s0022336000057802.

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Seven new monoplacophoran genera and species are described and figured from Cambrian and Lower Ordovician strata of the Ozark Uplift of Missouri; Biloboconus frizelli, Ulrichoconus bonneterrense, Potosiplina delorensis, Gayneoconus echolsi, Irondalia irondalensis, Titanoplina meramecensis, and Wildernessia inexpectans. A new species of Kirengella, K. oregonensis, is described, and Hypseloconus compressus (Ulrich and Bridge, 1930, and H. expansus Stinchcomb, 1986, are assigned to the genus Kirengella. The morphology of Kirengella is compared to highly arched forms of the plated mollusk genus Pr

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40

Checa, Antonio G., Antonio Sánchez-Navas, and Alejandro Rodríguez-Navarro. "Crystal Growth in the Foliated Aragonite of Monoplacophorans (Mollusca)." Crystal Growth & Design 9, no. 10 (2009): 4574–80. http://dx.doi.org/10.1021/cg9005949.

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41

Yochelson, Ellis L. "Macroscenella (Mollusca) from the Middle Ordovician of Wisconsin—a reinterpretation and reassignment." Journal of Paleontology 68, no. 6 (1994): 1252–56. http://dx.doi.org/10.1017/s0022336000034259.

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Description of two new specimens of Macroscenella superba (Billings) provides additional data on this rare, poorly known Paleozoic genus. Macroscenella was considered first to be a gastropod, then a monoplacophoran, and finally a coelenterate. Chondrophorine affinities for this form cannot be totally ruled out, but the new specimens increase the probability that it is a mollusk. If so, Macroscenella is more likely a patellacean gastropod than a member of any other group of the Mollusca, though evidence for placement within the Mollusca is equivocal; the interior of the specimens is not exposed

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42

Killeen, Ian J., and Stephen M. Smith. "Micropilina minuta Warén, 1989: A Monoplacophoran New to the British Marine Fauna." Journal of Conchology 35, no. 1 (1994): 88. https://doi.org/10.5962/p.407951.

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43

Feng, Weimin, and Weiguo Sun. "Monoplacophoran Igorella-type pore-channel structures from the Lower Cambrian in China." Materials Science and Engineering: C 26, no. 4 (2006): 699–702. http://dx.doi.org/10.1016/j.msec.2005.09.102.

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44

Granier, Bruno, Bernard Clavel, Jean Charollais, and MarcWeidmann. "Latest Jurassic - Early Cretaceous Dasycladalean Algae (Chlorophyta) From The Morand Drilling At Montricher (Canton Of Vaud, Switzerland)." Acta Palaeontologica Romaniae 10, no. 1-2 (2014): 1–2. https://doi.org/10.5281/zenodo.13189719.

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Granier, Bruno, Clavel, Bernard, Charollais, Jean, MarcWeidmann (2014): Latest Jurassic - Early Cretaceous Dasycladalean Algae (Chlorophyta) From The Morand Drilling At Montricher (Canton Of Vaud, Switzerland). Acta Palaeontologica Romaniae 10 (1-2): 1-2, DOI: 10.5281/zenodo.13189719

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45

LINSLEY, ROBERT M., and JOHN S. PEEL. "Gonad pouches in a new clam-like monoplacophoran from the Silurian of Sweden." Lethaia 16, no. 4 (2007): 273–80. http://dx.doi.org/10.1111/j.1502-3931.1983.tb02009.x.

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46

STINCHCOMB, BRUCE L., and NICHOLAS A. ANGELI. "NEW CAMBRIAN AND LOWER ORDOVICIAN MONOPLACOPHORANS FROM THE OZARK UPLIFT, MISSOURI." Journal of Paleontology 76, no. 6 (2002): 965–74. http://dx.doi.org/10.1666/0022-3360(2002)076<0965:ncalom>2.0.co;2.

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47

Ebbestad, Jan Ove R., Jiří Frýda, Peter J. Wagner, et al. "Chapter 15 Biogeography of Ordovician and Silurian gastropods, monoplacophorans and mimospirids." Geological Society, London, Memoirs 38, no. 1 (2013): 199–220. http://dx.doi.org/10.1144/m38.15.

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Checa, Antonio G., Joaquín Ramírez-Rico, Alicia González-Segura, and Antonio Sánchez-Navas. "Nacre and false nacre (foliated aragonite) in extant monoplacophorans (=Tryblidiida: Mollusca)." Naturwissenschaften 96, no. 1 (2008): 111–22. http://dx.doi.org/10.1007/s00114-008-0461-1.

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Rohr, David M., and Ellis L. Yochelson. "An unusual new bellerophontacean gastropod from the Ordovician (Whiterockian) of Nevada." Journal of Paleontology 64, no. 6 (1990): 956–60. http://dx.doi.org/10.1017/s0022336000020023.

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Abstract:

Groomodiscus rossi n. gen. and sp., a bellerophontacean from the Ordovician of Nevada that uncoiled at maturity, is described and placed in the Gastropoda. The deep notch or sinus of the shell is interpreted to have functioned the same as a deep slit, and the new genus is placed within the tropidodiscinids. Uncoiling and thickening of the shell in the mature stage of growth is probably an indication of a fundamental change of life style to a sedentary mode. Fragmentary specimens of the final, uncoiled portion of the whorl resemble the apertural portion of hyoliths. From a functional viewpoint,

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Vinther, Jakob, Erik A. Sperling, Derek E. G. Briggs, and Kevin J. Peterson. "A molecular palaeobiological hypothesis for the origin of aplacophoran molluscs and their derivation from chiton-like ancestors." Proceedings of the Royal Society B: Biological Sciences 279, no. 1732 (2011): 1259–68. http://dx.doi.org/10.1098/rspb.2011.1773.

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Abstract:

Aplacophorans have long been argued to be basal molluscs. We present a molecular phylogeny, including the aplacophorans Neomeniomorpha (Solenogastres) and Chaetodermomorpha (Caudofoveata), which recovered instead the clade Aculifera (Aplacophora + Polyplacophora). Our relaxed Bayesian molecular clock estimates an Early Ordovician appearance of the aculiferan crown group consistent with the presence of chiton-like molluscs with seven or eight dorsal shell plates by the Late Cambrian (approx. 501–490 Ma). Molecular, embryological and palaeontological data indicate that aplacophorans, as well as

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