Erik J. Ragsdale

Publications57
h-index19
Citations1,224
Highly Influential Citations26
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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.
A Developmental Switch Coupled to the Evolution of Plasticity Acts through a Sulfatase
Large-scale diversification without genetic isolation in nematode symbionts of figs
TLDR
A remarkable case of macroevolutionary-scale diversification without genetic divergence in fig-associated nematodes is reported, showing that rapid filling of potential ecological niches is possible without diversifying selection on genotypes.
Taxonomy and natural history: the genus Pristionchus
Allodiplogaster josephi n. sp. and A. seani n. sp. (Nematoda: Diplogastridae), associates of soil-dwelling bees in the eastern USA
TLDR
The two new species are distinguished by reproductive isolation, shape of the spicule manubrium, host associations and molecular characters, the latter in sequences of the near-full length small subunit rRNA gene, D2-D3 expansion segments of the large subunit (LSU) r RNA gene and partial mitochondrial COI.
Parapristionchus giblindavisi n. gen., n. sp. (Rhabditida: Diplogastridae) isolated from stag beetles (Coleoptera: Lucanidae) in Japan
TLDR
Discovery and description of a close sister group to Pristionchus, a model biological system, enables character polarisation in macroevolutionary studies of Pristonchus nematodes.
Three‐dimensional reconstruction of the stomatostylet and anterior epidermis in the nematode Aphelenchus avenae (Nematoda: Aphelenchidae) with implications for the evolution of plant parasitism
TLDR
A three‐dimensional model of the stomatostylet and associated structures has been reconstructed from serial thin sections of Aphelenchus avenae, a representative of Tylenchomorpha, a group including most plant parasitic nematodes, to better understand the evolution of the stylet and its associated cells.
Comparative, three‐dimensional anterior sensory reconstruction of Aphelenchus avenae (nematoda: Tylenchomorpha)
TLDR
Models, showing detailed morphology and spatial relationships of cuticular sensilla and internal sensory receptors, are the first computerized reconstruction of sensory structures of a Tylenchomorpha nematode, and provide a basis for expansion of the experimental behavioral model of C. elegans to the economically important nematodes of Tylineries.
Phylogeny and biogeography of the genus Cephalenchus (Tylenchomorpha, Nematoda)
TLDR
Within Cephalenchus, amphidial opening morphology shows congruence with molecular‐based phylogenetic relationships, whereas the number of lines in the lateral field is likely to be a convergent trait.
Reconstruction of the pharyngeal corpus of Aphelenchus avenae (Nematoda: Tylenchomorpha), with implications for phylogenetic congruence
TLDR
The corpus of the pharynx in the nematode Aphelenchus avenae was three-dimensionally reconstructed to address questions of phylogenetic significance and putative homologies and conserved arrangement of pharyngeal neurones in Tylenchomorpha expand the experimental model of C. elegans.
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