title: Redescription of Steinernema longicaudum Shen & Wang (Nematoda: Steinernematidae); geographic distribution and phenotypic variation between allopatric populations.
abstract: Steinernema longicaudum Shen & Wang is redescribed based on a comparative morphological study of specimens from the type isolate from China, and two other isolates recovered from Korea and the USA. For the first and second generation female, the location of the vulva, shape of the vulval lips, and shape and length of the tail were newly observed diagnostic characters. A more detailed description of the morphology of the male spicules and gubernaculum, and the arrangement of the genital papillae is included. A description, based on scanning electron microscopy observations, of the lateral field pattern of the third-stage infective juveniles is also provided. Additionally, restriction fragment length polymorphism profiles based on the internal transcribed spacer region, and cross-breeding tests supplement the description of this species.
authors.affiliation: Department of Nematology, University of California Davis, Davis, CA 95616-8668, USA. spstock@ucdavis.edu
authors.forename: S P
authors.initials: SP
authors.lastname: Stock
authors.forename: J
authors.initials: J
authors.lastname: Heng
authors.forename: D J
authors.initials: DJ
authors.lastname: Hunt
authors.forename: A P
authors.initials: AP
authors.lastname: Reid
authors.forename: X
authors.initials: X
authors.lastname: Shen
authors.forename: H Y
authors.initials: HY
authors.lastname: Choo
mesh_terms: D000818:Animals; D002140:California; D002681:China; D003433:Crosses, Genetic; D005260:Female; D007723:Korea; D008297:Male; D008854:Microscopy, Electron; D009348:Nematoda / Q000235:genetics* / Q000648:ultrastructure*; D010641:Phenotype; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D013623:Tail / Q000033:anatomy & histology; D014844:Vulva / Q000033:anatomy & histology