University of California, Riverside

Department of Nematology

James Baldwin Faculty Page

James Baldwin

James Baldwin
Professor and Nematologist
1443 Boyce Hall

Lab Website

Research areas:

Our approach to systematics is testing hypotheses of nematode evolution in part through comparative reconstruction and developmental biology of character rich-nematode structures. Often studies are designed to address questions of character homology and to detect and understand parallel and convergent evolution of morphological traits. Primary tools include DIC light microscopy, video imaging, transmission, TEM tomography, scanning, confocal, and 4D microscopy. Through collaboration with molecular biologists we use molecular-based phylogenetic trees to map the evolution of independent morphological/developmental characters. Our reconstruction of feeding structures in Rhabditida and outgroups Cephalobina and Diplogastrina is being used to test classical hypotheses of evolution and is being expanded to test hypotheses of evolution of the stylet and plant parasitism in Tylenchida. We are also extending studies of feeding structures to groups believed to be basal to Secernentea. An important aspect of our phylogenetic studies is survey and description of new taxa. In this regard, we have ongoing surveys of the southwestern deserts of the USA. Currently we are conducting a survey of marine nematodes of Mexico's Gulf of California in conjunction with Mexican collaborators. Our surveys and phylogenetic research is dependent on exchanges with scientists worldwide and with material we curate at the UCRNC taxonomic museum.



Recent Journal Articles:

95. Subbotin, S.A., Ragsdale, E.J., Mullens, T., Roberts, P.A., Mundo-Ocampo, M., 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 Phylogeny and Evolution. Vol. 48: p.491-505.

96. Ragsdale, E.J., Crum, J., Ellisman, M.H., Baldwin, J.G. 2008. Phylogenetic implications of three dimensional reconstruction of the stomatostylet and anterior epidermis in Aphelenchus avenae. Journal of Morphology. Vol. 269: p.1181-1196.

97. Holovachov, O., De Ley, I.T., Mundo-Ocampo, M., Baldwin, J.G., Rocha-Oliveras, A., De Ley, P. 2008. Nematodes from the Gulf of California, part 1: the genera Ceramonema Cobb, 1933, Pselionema Cobb, 1933 and Pterygonema Gerlach, 1954. Nematology. Vol. 10: p.347-373.

98. Mundo-Ocampo, M., Trocolli, A., Subbotin, S.A., Del Cid, J., Baldwin, J.G., Inserra, R.N. 2009. Synonomy of Afenestrata with Heterodera supported by phylogenetics with molecular and morphological characterization of H. koreana comb. n. and H. orientalis comb. n. (Tylenchida: Heteroderidae). Nematology. Vol. 11: p.611-632.

99. Bumbarger, D.J., Wijeratne, S., Carter, C., Crum, J., Ellisman, M.H., Baldwin, J.G. 2009. Three dimensional reconstruction of the amphid sensilla in the microbial feeding nematode, Acrobeles complexus (Nematoda: Rhabditida). Journal of Comparative Neurology. Vol. 512: p.271-281.

100. Ragsdale, E.J., Ngo, P., Crum, J., Ellisman, M.H., Baldwin, J.G. 2009. Comparative, three-dimensional anterior sensory reconstruction of Aphelenchus avenae (Nematoda: Tylenchomorpha). Journal of Comparative Neurology. Vol. 517: p.616-632.

101. Trinh, P.Q., Waeyenberge, L., Nguyen, C.N., Baldwin, J.G., Karssen, G., Moens, M. 2009. Apratylenchus vietnamensis gen. n., sp. n. and A. binhi gen. n., sp. n., sedentary Pratylenchidae (Nematoda: Tylenchida) from coffee in Vietnam, with proposal of Apratylenchinae subfam. n. Nematology. Vol. 11: 1 p.1-17.

102. Mundo-Ocampo, M., Baldwin, J.G. 2010. Type specimens deposited at the University of California Riverside Nematode Collection. Nematology. Vol. 12: 1 p.25-48.

103. Ragsdale, E.J., 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. Vol. 277: p.1299-2195. doi:10.1098/rspb.2009.2195

104. Subbotin, S A., Inserra, R N., Marais , M, Mullin, P G., Powers, T O., Roberts, P A., Van Den Berg, E, Yeates, G, Baldwin, J.G. 2010. Diversity and phylogenetic relationships within the spiral nematodes of Helicotylenchus Steiner, 1945 (Tylenchida: Hoplolaimidae) as inferred from analysis of the D2-D3 expansion segments of 28S rRNA gene sequences. Nematology. Vol. 12: 6 p.1- 13.

105. Ragsdale, E.J., Ngo, P., Crum, J., Baldwin, J.G., Ellisman, M.H. 2011. Reconstruction of the pharyngeal corpus of Aphelenchus avenae (Nematoda: Tylenchomorpha), with implications for phylogenetic congruence . Zoological Journal of the Linnean Society. Vol. 161: p.1-30.

106. Ragsdale, E.J., Mundo-Ocampo, M., Bumbarger, D.J., Baldwin, J.G. 2011. Cervidellus sonorensis n. sp. (Nematoda: Cephalobidae) from the desert of Anza-Borrego, CA, USA. Nematology. Vol. 13: 5 p.607-617.

107. Subbotin, S.A., Cid Del Prado Vera, I., Mundo-Ocampo, M., Baldwin, J.G. 2011. Identification, phylogeny and phylogeography of circumfenestrate cyst nematodes (Nematoda: Heteroderidae) as inferred from analysis of ITS-rDNA. Nematology. Vol. 13: p.805- 824.

108. Bik, H.M ., Sung, W., De Ley, P., Sharma, J., Rocha-Olivares, A., Baldwin, J.G., Thomas, W.K. 2012. Metagenetic community analysis of microbial eukaryotes illuminates biogeographic patterns in deep sea and shallow water sediments. Molecular Ecology 21:1048-1059.12p.doi: 10.1111/j.1365-294X.2011.05297.x

109. Atighi, M.R., Pourajam, E., Pereira, T.J., Okhovvat, S.M., Alizada, B.A., Manuel, M., Baldwin, J.G. 2013. Redescription of Filenchus annulatus (Siddiqui & Khan, 1983) Siddiqi, 1986 based on specimens from Iran with contributions to the molecular phylogeny of the Tylenchida Nematology 15:129-141.

110. Microsporidia-nematode associations in methane seeps reveal basal fungal parasitism in the deep sea.  Frontiers in Microbiology 5:(article 43) 1-12

Recent Book Chapters

17. Baldwin, J.G., Mundo-Ocampo, M. 2011. Preservation and Shipping. Marine Benthic Nematode Molecular Protocol Handbook (Nematode Barcoding) Technical Study: No 7. Editors: International Seabed Authority. International Seabed Authority . Vol. 7: p.9- 11.

18. Baldwin, J.G., Mundo-Ocampo, M. 2011. Chapter 4: Morphology and Virtual Collections. Marine Benthic Nematode Molecular Protocol Handbook (Nematode Barcoding) Technical Study: No 7. . Editors: International Seabed Authority. International Seabed Authority . Kingston, Jamaica. p.11-18.

19. Decraemer, W., Coomans, A., Baldwin, J.G. 2014.  Nematoda: Morphology of nematodes pages 1-59 in. Handbuch der Zoologie/Handbook of ZoologyNemathelminthese and Gnathifera . Editors: Andreas Schmidt-Rhaesa. Walter de Gruyter Inc. Germany. De Gruyter GmbH, Berlin.

Recent Books:

1. Subbotin, S.A., Mundo-Ocampo, M., Baldwin, J.G. 2010. Systematics of Cyst nematodes (Nematoda: Heteroderinae) Part A. Brill. The Netherlands. 300p.

2. Subbotin, S.A., Mundo-Ocampo, M., Baldwin, J.G. 2010. Systematics of Cyst Nematodes (Nematoda: Heteroderinae Part B. Brill. The Netherlands. 450p.

Recent Book reviews:

4. Baldwin, James G. Root-knot nematodes. Ed. 1st. Perry, Moens and Starr (editors). CABI International, London: 488p. Information about the book review itself: Root-Knot Nematodes. Published on 09/01/2010. The Quarterly Review of Biology Vol. 85: .370-371.

More Information

General Campus Information

University of California, Riverside
900 University Ave.
Riverside, CA 92521
Tel: (951) 827-1012

Department Information

Department of Nematology
Margarita Flores
1447 Boyce Hall

Tel: (951) 827-3598
Fax: (951) 827-2364