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:

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.  Amir Sapir, Adler R. Dillman, Stephanie A. Connon, Benjamin M. Grupe, Jeroen Ingels, Manuel Mundo-Ocampo, Lisa A. Levin, James G. Baldwin, Victoria J. Orphan and Paul W. Sternberg. 2014. Microsporidia-nematode associations in methane seeps reveal basal fungal parasitism in the deep sea.  Frontiers in Microbiology 5:1-12

111. Sapir, A., Dillman, A., Connon, S.A., Grupe, B.M., Ingels, J., Mundo-Ocampo, M., Levin, L., Baldwin, J.G., Orphan, V., Sternberg, P. 2014. Microsporidia-nematode association in methane seeps reveal basal fungal parasitism in the deep sea. frontiers in Microbiology. Vol. 5: 43 p.1-12. 12p. (Refereed, Electronic, Invited)

112. Kim, J., Lee, S., Gazi, M., Kim, T., Chun, J., Seo, T., Park, C., Baldwin, J.G., Nadler, S.A., Park, J. 2015 Mitochondrial genomes advance phylogenetic hypothses for Tylenchina (Nematoda: Chromadorea.  Zoologica Scripta.  44:446-462.

113 Pereria, Tiago, Jose and James Gordon Baldwin.  2016.  Contrasting evolutionary patterns of 28S and ITS rRNA genes reveal high intragenomic variation in Cephalenchus (Nematoda): Implctiton for species delimitation.  Molecular Phylogenetics and Evolution 98:244-260

114 Pereira, Tiago J., Xue Qing, Kuei-Fu Chang, Manuel Mundo-Ocampo, Juvenile Cares, Erik Ragsdale, Chau N. nguyen and James G. Baldwin, 2016.  Phylogeny and biogeography of the genus Cephalenchus (Tylenchomorpha, Nematoda)  Zoologica ScriptaX:1-15

115  Mundo-Ocampo, Manuel, J. G. Baldwin, T. J. Pereira, R. J. Camacho-Baez, A. D. Armenta Bojorquez, M. Camaho-Haro and J. O. Becker, 2017,  Occurrence of Belonolaimus in Sinaloa, Northwestern Mexico: A New report on distribution and host range.  J. Nemaology 49:105-115.

116 Lu, Dihong, Marissa Maccietto, Denis Chang, Miraya M. Barros, James Baldwin, Ali Mortazavi and A. R. Dillman, 2017.  Activated entomopathogenic nematode infective juveniles release lethal venom proteins. PLOS Pathogens X:1-32

117 Burr, A. H. Jay and James G. Baldwin, 2016.  The Nematode Stoma Homology of Celll Architecture with Improved Understanding by confocal microscopy of labeled cell boundaries.  Journal of Morphology 277:1168-1186.

Recent Book Chapters

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.

20.  Baldwin, J. G. and Zafar Handoo, 2018.  General morphology of Cyst Nematodes pages 343-364 in Perry, R. N. M. Moens and J. T. Jones (eds) Cyst Nematodes. Cabi International. 

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.


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