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          Institute: MPI für Entwicklungsbiologie     Collection: Abteilung 4 - Evolutionary Biology (R. Sommer)     Display Documents

ID: 681798.0, MPI für Entwicklungsbiologie / Abteilung 4 - Evolutionary Biology (R. Sommer)
Three new species of Pristionchus (Nematoda: Diplogastridae) show morphological divergence through evolutionary intermediates of a novel feeding-structure polymorphism
Authors:Ragsdale, E. J.; Kanzaki, N.; Roeseler, W.; Herrmann, M.; Sommer, R. J.
Date of Publication (YYYY-MM-DD):2013-08
Title of Journal:Zoological Journal of the Linnean Society
Journal Abbrev.:Zoological Journal of the Linnean Society
Issue / Number:4
Start Page:671
End Page:698
Sequence Number of Article:DOI: 10.1111/zoj.12041
Review Status:Internal review
Audience:Experts Only
Abstract / Description:Developmental plasticity is often correlated with diversity and has been proposed as a facilitator of phenotypic novelty. Yet how a dimorphism arises or how additional morphs are added is not understood, and few systems provide experimental insight into the evolution of polyphenisms. Because plasticity correlates with structural diversity in Pristionchus nematodes, studies in this group can test the role of plasticity in facilitating novelty. Here, we describe three new species, Pristionchus fukushimaesp.nov., Pristionchus hoplostomussp.nov., and the hermaphroditic Pristionchus triformissp.nov., which are characterized by a novel polymorphism in their mouthparts. In addition to showing the canonical mouth dimorphism of diplogastrid nematodes, comprising a stenostomatous (narrow-mouthed') and a eurystomatous (wide-mouthed') form, the new species exhibit forms with six, 12, or intermediate numbers of cheilostomatal plates. Correlated with this polymorphism is another trait that varies among species: whereas divisions between plates are complete in P.triformissp.nov., which is biased towards a novel megastomatous' form comprising 12 complete plates, the homologous divisions in the other new species are partial and of variable length. In a reconstruction of character evolution, a phylogeny inferred from 26 ribosomal protein genes and a partial small subunit rRNA gene supported the megastomatous form of P.triformissp.nov. as the derived end of a series of split-plate forms. Although split-plate forms were normally only observed in eurystomatous nematodes, a single 12-plated stenostomatous individual of P.hoplostomussp.nov. was also observed, suggesting independence of the two types of mouth plasticity. By introducing these new species to the Pristionchus model system, this study provides further insight into the evolution of polymorphisms and their evolutionary intermediates.(c) 2013 The Linnean Society of London
Free Keywords:developmental plasticity; dimorphism; hermaphrodite; pristionchus fukushimae sp nov.; pristionchus hoplostomus sp nov.; pristionchus triformis sp nov.; phylogeny; stoma; taxonomy; phenotypic plasticity; n. sp; genetic accommodation; maximum-likelihood; genus pristionchus; pacificus; japan; polyphenism; phylogeny; beetles
External Publication Status:published
Document Type:Article
Communicated by:MPI für Entwickungsbiologie
Affiliations:MPI für Entwicklungsbiologie/Abteilung 4 - Evolutionsbiologie (Ralf J. Sommer)
External Affiliations:Max Planck Inst Dev Biol, Dept Evolutionary Biol, Spemannstr 37, Tubingen, Germany Max Planck Inst Dev Biol, Dept Evolutionary Biol, Spemannstr 37, Tubingen, Germany Max Planck Inst Dev Biol, Dept Evolutionary Biol, Tubingen, Germany Forestry & Forest Prod Res Inst, Forest Pathol Lab, Tsukuba, Ibaraki 3058687, Japan %G English
Identifiers:ISSN:0024-4082 %R Doi 10.1111/Zoj.12041 [ID No:1]
ISI:000322333500001 [ID No:2]
ISI:000322333500001 [ID No:3]
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