Fine structure of body wall cuticle of females of Meloidodera charis, Atalodera lonicerae, and Sarisodera hydrophila (Heteroderidae)
AbstractThe body wall cuticle of adult females of Meloidodera charis, Atolodera lonicerae, and Sarisodera hydrophila is examined by transmission electron and light microscopy for comparison with Heterodera schachtii and previous observations of additional species of Heterodera, Globodera, and Punctodera. The cuticle of M. charis is least complex, consisting of layers A, B, C (with A outermost), and varies in overall thickness from 3 to 8 [mu]m. As in other species, the cuticle is thickest in mature specimens. The cuticle of A. lonicerae is 6-9 [mu]m thick; unlike M. charts it has an innermost layer, D, in addition to A, B, and C. The cuticle of S. hydrophila varies from 14 to 30 [mu]m thick and includes a D layer similar to A. lonicerae; layer C is subdivided into additional zones relative to other heteroderids, and the external portion of the cuticle is infused with an electron-dense material. The presence of a D layer in A. lonicerae and S. hydrophila is a character state which is shared with Globodera spp. and Punctodera sp. The electron-dense material in the outer layers of S. hydrophila also occurs in Globodera spp. and Punctodera sp. On the other hand, H. schachtii resembles other Heterodera spp. as well as M. charis by the absence of a D layer and lack of electron-dense material in the outer layers. The pattern of occurrence of shared character states, including those of the cuticle, may be useful for phylogenetic analysis of Heteroderidae. Key words: cyst, electron microscopy, Globodera, Heterodera, Punctodera, Heteroderoidea, Tylenchida, phylogeny.
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