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ENDO ET AL.— ULTRASTRUCTURE OF THE LESION NEMATODE 169 uc |jy? 1.0 jim Figure 19. Transverse section through the uterine channel (UC) of P. penetrans showing the broad opening for egg passage. The bands of muscles adjacent to the uterine channel are the dilatores vaginae (DVa). The bands of muscles midventral and close to the body wall cuticle constitute the vulval wall muscles, dilatores vulvae (DVu). I, intestine; U, uterus. a bipartite pattern consisting of 2 lateral elements but lacking striated central elements (Westergaard and von Wettstein, 1972; Goldstein and Triantaphyllou, 1995). Whether or not the tripartite pattern of the synaptonemal complex occurs in most species of Pratylenchus is not yet determined. Observations of Caenorhabditis elegans show that developing oocytes are arranged in single file along the proximal arm of the ovary, the site of gametogenesis in a hermaphrodite. Oocytes are arrested at diakinesis in meiotic prophase I. After the oocyte is fertilized, the zygote moves through the spermatheca to the uterus, where meiosis is completed (Kimble and Ward, 1988). In Xiphinema theresiae, the ovary has 2 types of cells: the ovarian epithelial cells and the germ cells (Van De Velde and Coomans, 1988). The ovarian epithelial cells form a thin layer around the germ cells and have nuclei between some of the germ cells. At some sites, processes of ovarian epithelial cells extend inward to form a central cytoplasmic mass, which has cytoplasmic contact with the germ cells. These cells develop 2 membrane-derived features, the villi and the small coated bulges, which are thought to play a role in transport. However, X. theresiae does not have a typical rachis, a large, clearly delineated structure, around which oogonia are arranged and make cytoplasmic contact. Bird and Bird (1991) described a typical rachis for the telogonic and didelphic reproductive system of the female root-knot nematode, Meloidogyne javanica. The oogonia are radially arranged around a central anucleate rachis to which oogonia are attached by cytoplasmic bridges. In C. elegans, which is monodelphic, mitotic germ cells occupy the distal end of the ovary, and meiotic cells occupy the remaining portion of the gonad (Kimble and White, 1981). A typical rachis was not observed in the female reproductive system of P. penetrans. Copyright © 2011, The Helminthological Society of Washington
SM ,v 20 Figures 20-22. Section of an egg of Pratylcnchiis penetrans. 20. Tangential section through an egg within the postvulvar uterine branch. This section is from the same specimen shown shows an oocyte in the oviduct. The oocyte cytoplasm is filled primarily with lipid bodies. In contrast, the cytoplasm of the egg contains numerous irregularly shaped electron-translucent lip numerous electron-dense protein granules (PG) that generally occur around the lipid droplets. The nucleus (N) is located near one end of the egg. The egg shell (ES) has a well-defined vitelline layer and an electron-translucent inner chitinous layer. Electron-dense secretory granules (SG) accumulate on the surface of the egg. Similar granules occur singly or in clusters cells of the uterus or supporting cells of the uterine channel. The intercellular electron-dense granules originating in these cells appear to be secreted and deposited on the egg shell. C, muscle. 21. Enlargement of a portion of the egg shell shown in Figure 20. Secretory granules (SG) near the surface of the egg shell appear to contribute to the electron-dense outer vitelline easily distinguished from the electron-translucent inner chitinous layer (CL). 22. Enlargement of nucleus (N) of egg shown in Figure 20. Chromatin (Cr) occurs within the nucleoplasm. Copyright © 2011, The Helminthological Society of Washington
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Volume 66 JOURNAL of The Helminthol
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J. Helminthol. Soc. Wash. 66(2), 19
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FIORILLO AND FONT—SEASONAL DYNAMI
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YABSLEY AND NOBLET—HELMINTHS OF R
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MUZZALL—NEMATODES OF YELLOW PERCH
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Page 27 and 28: Table 1. Comparison between the Sou
Page 29 and 30: AMIN ET AL.—PLAGIORHYNCHUS IN SOU
Page 31 and 32: AMIN ET M_.—PLAGIORHYNCHUS IN SOU
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Page 37 and 38: REGO ET AL.—SC/ADOCEPHALUS MEGALO
Page 39 and 40: REGO ET AL.—SC/ADOCEPHALUS MEGALO
Page 41 and 42: KRITSKY AND KULO—MONOGENEANS FROM
Page 49 and 50: SCHOLZ ET AL.—REDESCRIPTION OF PS
Page 51 and 52: SCHOLZ ET AL.—REDHSCRIPTION OF PS
Page 59 and 60: A ENDO ET AL.—ULTRASTRUCTURE OF T
Page 61 and 62: 158 JOURNAL OF THE HELMINTHOLOGICAL
Page 65 and 66: ENDO ET AL.—ULTRASTRUCTURE OF THE
Page 69 and 70: 11 Figure 11. Longitudinal section
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Page 85 and 86: BURSEY AND GOLDBERG—SKRJABINODON
Page 87 and 88: BURSEY AND GOLDBERG—SKRJAB1NODON
Page 89 and 90: BURSEY AND GOLDBERG—PARAPHARYNGOD
Page 91 and 92: Egg s 83-95 88-96 75-90 109-119 90-
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Page 103 and 104: RESEARCH NOTES 195 Table 1. Prevale
Page 105 and 106: RESEARCH NOTES 197 live feature not
Page 107 and 108: RESEARCH NOTES 199 and an I- or Y-s
Page 109 and 110: 201 genes as an additional source o
Page 111 and 112: RESEARCH NOTES 203 Tenebrio molitar
Page 113 and 114: RESEARCH NOTES 205 rat intestine (M
Page 115 and 116: RESEARCH NOTES 207 Table 1. Helmint
Page 121 and 122: J. Helminthol. Soc. Wash. 662, 1999
Page 123 and 124: INDEX 215 Mastacembelidae, 52 Masta
Page 125 and 126: APPLICATION FOR MEMBERSHIP in the H
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*Edna M. Buhrer *Mildred A. Doss *
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