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publications


Main research foci


covers Ragsdale, E. J. and Ivers, N. A. (2016). Specialization of a polyphenism switch gene following serial duplications in Pristionchus nematodes. Evolution 70: 2155–2166. [article]

Kieninger, M. R., Ivers, N. A., Rödelsperger, C., Markov, G. V., Sommer, R. J., and Ragsdale, E. J. (2016). The nuclear hormone receptor NHR-40 acts downstream of the sulfatase EUD-1 as part of a developmental plasticity switch in Pristionchus. Current Biology 26:1–6. [article]

F1000Susoy, V., Herrmann, M., Kanzaki, N., Kruger, M., Nguyen, C. N., Rödelsperger, C., Röseler, W., Weiler, C., Giblin-Davis, R. M., Ragsdale, E. J., and Sommer, R. J. (2016). Large-scale diversification without genetic isolation in nematode symbionts of figs. Science Advances 2: e1501031. Recommended by Faculty of 1000. [article]

—Featured in: Phillips, P. C. (2016). Evolution: five heads are better than one. Current Biology 26: R275–R296. [article]

Ragsdale, E. J. (2015). Mouth dimorphism and the evolution of novelty and diversity. In: Pristionchus pacificus: a nematode model for comparative and evolutionary biology. Sommer, R. J., Ed. Leiden: Brill, pp. 301–329.

Susoy, V., Ragsdale, E. J., Kanzaki, N., and Sommer, R. J. (2015). Rapid diversification associated with a macroevolutionary pulse of developmental plasticity. eLife 4: e05463. [article]

—Featured in: Nijhout, H. F. (2015). Evolution: to plasticity and back again. eLife 4: e06995. [article]

Serobyan, V., Ragsdale, E. J., and Sommer, R. J. (2014). Adaptive value of a predatory mouth-form in a dimorphic nematode. Proceedings of the Royal Society of London B 281: 20141334. [article]

Ragsdale, E. J., Müller, M. R., Rödelsperger, C., and Sommer, R. J. (2013). A developmental switch coupled to the evolution of plasticity acts through a sulfatase. Cell 155: 922–933. [article]

—Featured in: Hartenstein, V. and Jacobs, D. (2013). Developmental plasticity, straight from the worm's mouth. Cell 155: 742–743. [article]

Serobyan, V., Ragsdale, E. J., Müller, M. R., and Sommer, R. J. (2013). Feeding plasticity in the nematode Pristionchus pacificus is influenced by sex and social context and is linked to developmental speed. Evolution & Development 15: 161–170. [article]

Bose, N., Ogawa, A., von Reuss, S. H., Yim, J. J., Ragsdale, E. J., Sommer, R. J., and Schroeder, F. C. (2012). Complex small-molecule architectures regulate phenotypic plasticity in a nematode. Angewandte Chemie 51: 12438–12443. [article]


Taxonomy & natural history


Pereira, T. J., Qing, X., Chang, K. F., Mundo-Ocampo, M., Cares, J. E., Ragsdale, E. J., Nguyen, C. N., and Baldwin, J. G. (2016). Phylogeny and biogeography of the genus Cephalenchus (Tylenchomorpha, Nematoda). Zoologica Scripta in press.

Kanzaki, N., Giblin-Davis, R. M., and Ragsdale, E. J. (2015). Allodiplogaster josephi n. sp. and A. seani n. sp. (Nematoda: Diplogastridae), associates of soil-dwelling bees in the eastern USA. Nematology 17: 831–863. [article]

Ragsdale, E. J., Kanzaki, N., and Herrmann, M. (2015). Taxonomy and natural history: the genus Pristionchus. In: Pristionchus pacificus: a nematode model for comparative and evolutionary biology. Sommer, R. J., Ed. Leiden: Brill, pp. 77–120.

Kanzaki, N., Ragsdale, E. J., and Giblin-Davis, R. M. (2014). Revision of the paraphyletic genus Koerneria Meyl, 1960 and resurrection of two other genera of Diplogastridae (Nematoda). ZooKeys 442: 17–30. [article]

Ragsdale, E. J., Kanzaki, N., and Sommer, R. J. (2014). Levipalatum texanum n. gen., n. sp. (Nematoda: Diplogastridae), an androdioecious species from the south-eastern USA. Nematology 16: 695–709. [article]

Kanzaki, N., Ragsdale, E. J., Herrmann, M., and Sommer, R. J. (2014). Two new and two recharacterized species from a radiation of Pristionchus (Nematoda: Diplogastridae) in Europe. Journal of Nematology 46: 60–74. [article]

Kanzaki, N., Ragsdale, E. J., Susoy, V., and Sommer, R. J. (2014). Leptojacobus dorci n. gen., n. sp. (Nematoda: Diplogastridae), an associate of Dorcus stag beetles (Coleoptera: Lucanidae). Journal of Nematology 46: 50–59. [article]

Ragsdale, E. J., Kanzaki, N., Röseler, W., Herrmann, M., and Sommer, R. J. (2013). Three new species of Pristionchus (Nematoda: Diplogastridae) show morphological divergence through evolutionary intermediates of a novel feeding-structure polymorphism. Zoological Journal of the Linnean Society 168: 671–698. [article]

Herrmann, M., Ragsdale, E. J., Kanzaki, N., and Sommer, R. J. (2013). Sudhausia aristotokia n. gen., n. sp. and S. crassa n. gen., n. sp. (Nematoda: Diplogastridae): viviparous new species with precocious gonad development. Nematology 15: 1001–1020. [article]

Kanzaki, N., Ragsdale, E. J., Herrmann, M., Susoy, V., and Sommer, R. J. (2013). Two androdioecious and one dioecious new species of Pristionchus (Nematoda: Diplogastridae): new reference points for the evolution of reproductive mode. Journal of Nematology 45: 172–194. [article]

Kanzaki, N., Ragsdale, E. J., Herrmann, M., Röseler, W., and Sommer, R. J. (2013). Two new species of Pristionchus (Nematoda: Diplogastridae) support the biogeographic importance of Japan for the evolution of the genus Pristionchus and the model system P. pacificus. Zoological Science 30: 680–692. [article]

Kanzaki, N., Ragsdale, E. J., Herrmann, M., Röseler, W., and Sommer, R. J. (2013). Pristionchus bucculentus n. sp. (Rhabditida: Diplogastridae) isolated from a shining mushroom beetle (Coleoptera: Scaphidiidae) in Hokkaido, Japan. Journal of Nematology 45: 78–86. [article]

Kanzaki, N., Ragsdale, E. J., Herrmann, M., Mayer, W. E., Tanaka, R., and Sommer, R. J. (2012). Parapristionchus giblindavisi n. gen., n. sp. (Rhabditida: Diplogastridae) isolated from stag beetles (Coleoptera: Lucanidae) in Japan. Nematology 14: 933–947. [article]

Kanzaki, N., Ragsdale, E. J., Herrmann, M., and Sommer, R. J. (2012). Two new species of Pristionchus (Rhabditida: Diplogastridae): P. fissidentatus n. sp. from Nepal and La Réunion Island and P. elegans n. sp. from Japan. Journal of Nematology 44: 80–91. [article]

Kanzaki, N., Ragsdale, E. J., Herrmann, M., Mayer, W. E., and Sommer, R. J. (2012). Description of three Pristionchus species (Nematoda: Diplogastridae) from Japan that form a cryptic species complex with the model organism P. pacificus. Zoological Science 29: 403–417. [article]

Ragsdale, E. J., Mundo-Ocampo, M., Bumbarger, D. J., and Baldwin, J. G. (2011). Cervidellus sonorensis n. sp. (Nematoda: Cephalobidae) from the desert of Anza-Borrego, CA, USA. Nematology 13: 607–617. [article]

Giblin-Davis, R. M., Kanzaki, N., De Ley, P., Williams, D. S., Schierenberg, E., Ragsdale, E. J., Zeng Y.-S., and Center, B. J. (2010). Ultrastructure and life history of Myolaimus byersi n. sp. (Myolaimina: Myolaimidae), a phoretic associate of the crane fly Limonia schwarzi (Alexander) (Limoniidae) in Florida. Nematology 12: 519–542. [article]

Subbotin, S. A., Ragsdale, E. J., Mullens, T., Roberts, P. A., Mundo-Ocampo, M., and Baldwin, J. G. (2008). A phylogenetic framework for root lesion nematodes of the genus Pratylenchus (Nematoda): evidence from 18S and D2-D3 expansion segments of 28S ribosomal RNA genes and morphological characters. Molecular Phylogenetics and Evolution 48: 491–505. [article]


Earlier research: novelty in nematode models


Ragsdale, E. J., Ngo, P. T., Crum, J., Ellisman, M. H., and Baldwin, J. G. (2011). Reconstruction of the pharyngeal corpus of Aphelenchus avenae (Nematoda: Tylenchomorpha), with implications for phylogenetic congruence. Zoological Journal of the Linnean Society 161: 1–30. [article]

Ragsdale, E. J. and Baldwin, J. G. (2010). Resolving phylogenetic incongruence to articulate homology and phenotypic evolution: a case study from Nematoda. Proceedings of the Royal Society of London B 277: 1299–1307. [article]

Ragsdale, E. J., Ngo, P. T., Crum, J., Ellisman, M. H., and Baldwin, J. G. (2009). Comparative, three-dimensional anterior sensory reconstruction of Aphelenchus avenae (Nematoda: Tylenchomorpha). Journal of Comparative Neurology 517: 616–632. [article]

Ragsdale, E. J., Crum, J., Ellisman, M. H., and Baldwin, J. G. (2008). Three-dimensional reconstruction of the stomatostylet and anterior epidermis in the nematode Aphelenchus avenae (Nematoda: Aphelenchidae) with implications for the evolution of plant parasitism. Journal of Morphology 269: 1181–1196. [article]

Baldwin, J. G., Ragsdale, E. J., and Bumbarger, D. (2004). Revised hypotheses for phylogenetic homology of the stomatostylet in tylenchid nematodes. Nematology 6: 623–632. [article]

 

Piercing mouthparts and associated cells in Aphelenchus avenae

 

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