Comparative Parasitology 68(2) 2001 - Peru State College

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248 COMPARATIVE PARASITOLOGY, 68(2), JULY 2001 Control of Insects. CRC Press, Inc., Boca Raton, Subbotin, S. A., V. N. Chizhov, and N. N. Zakhar- Florida, U.S.A. 277 pp. Riding, I. L. 1970. Microvilli on the outside of a nematode. Nature 226:179-180. Siddiqi, M. R. 2000. Tylenchida: Parasites of Plants and Insects, 2nd ed. CABI Publishing, St. Albans, U.K. 848 pp. Southey, J. F., ed. 1970. Laboratory methods for work with plant and soil nematodes, 5th ed. Technical Bulletin 2 of the Ministry of Agriculture, Fisheries and Food. Her Majesty's Stationery Office, London, U.K. 148 pp. enkova. 1993. Ultrastructure of the body wall of parasitic and infective females of Skarbilovinema laumondi (Tylenchida: lotonchiidae). Fundamental and Applied Nematology 16:1-4. , , and . 1994. Ultrastructure of the integument of parasitic females in entomoparasitic tylenchids. 1. Two species of the genus Wachekitylenchus, Allantonema mirabile and Bradynema rigidum. Russian Journal of Nematology 2:105-112. Report on the Brayton H. Ransom Memorial Trust Fund The Brayton H. Ransom Memorial Trust Fund was established in 1936 to "Encourage and promote the study and advance of the Science of Parasitology and related sciences." Income from the Trust currently provides token support of Comparative Parasitology and limited support for publication of meritorious manuscripts by authors lacking institutional or other backing. Donations or memorial contributions may be directed to the Secretary-Treasurer. Information about the Trust can be found in the following articles: Proceedings of the Helminthological Society of Washington (1936) 3:84-87; (1983) 50:200-204 and Journal of the Helminthological Society of Washington (1993) 60:144-150. Financial Report for 2000 Balance on hand, January 1, 2000 $24,459.06 Receipts: $ 1,402.64 Contributions from Members of the Helminthological Society of Washington will be credited in 2001 Interest received in 2000 $1,402.64 Disbursements ($6.00) Grant to the Helminthological Society of Washington for 2000—$50.00 (to be debited in 2001) Membership in the American Association for Zoological Nomenclature for 2000—$50.00 (to be debited in 2001) Bank charges ($6.00) On hand, December 31, 2000 $25,855.70 J. Ralph Lichtenfels, President Robin N. Huettel, Secretary-Treasurer Morgan Golden Trustees of the Brayton H. Ransom Memorial Trust Fund Copyright © 2011, The Helminthological Society of Washington J. Ralph Lichtenfels Acting for Secretary-Treasurer USDA:ARS:BARC-East, No. 1180 Beltsville, MD 20705-2350 David J. Chitwood Nancy D. Pacheco Harley G. Sheffield
Comp. Parasitol. 68(2), 2001, pp. 249-255 Tegumentary Ultrastructure (SEM) of Preadult and Adult Lobatostoma jungwirthi Kritscher, 1974 (Trematoda: Aspidogastrea) ANALIA PAOLA' AND MARIA CRISTINA DAMBORENEA2 Departamento Cientffico Zoologia Invertebrados, Facultad de Ciencias Naturales y Museo, Paseo del Bosque s/n° -1900- La Plata, CONICET.PIP 4728/96 Argentina (e-mail: 'apaola@museo.fcnym.unlp.edu.ar; 2cdambor@museo.fcnym.unlp.edu.ar) ABSTRACT: Larval Lobatostoma jungwirthi Kritscher, 1974 (Trematoda: Aspidogastrea) parasitize the digestive gland of Heleobia parchappii (d'Orbigny, 1835) (Mollusca: Hydrobiidae) and, as adults, the posterior intestine of the chameleon cichlid Cichlasotna facetum (Jenyns, 1842) (Pisces, Cichlidae). Currently, L. jungwirthi is the only aspidogastrid reported from freshwater fishes in Argentina. Tegumentary structures of preadults and adults of L. jungwirthi were observed under scanning electron microscopy. In the preadult, 2 types of sensory receptors were observed: monociliate papillae of intermediate length on the walls and crests of the ventral adhesive disc as well as on the disc periphery and oral lobules, and nonciliate dome-shaped papillae on the crests of the ventral adhesive disc, neck, and oral lobules. In adults, other types of sensory receptors could be observed: in the posterior dorsal region, monociliate papillae with longer cilia than those found in the preadult, and a multiciliate structure in the dorsal region at the posterior third of the body. This is the first record of a surface multiciliate receptor in aspidogastreans. The pores of marginal glands were found only between the anterior alveoli. KEY WORDS: Aspidogastrea, Lobatostoma jungwirthi, tegument, sensory papillae, SEM, Argentina. Lobatostoma jungwirthi Kritscher, 1974 (Trematoda: Aspidogastrea), is the only species of the genus that parasitizes freshwater fishes. It was first found in 1974, in the stripefin eartheater Gymnogeophagus rhabdotus (Hensel, 1870), in the Sinus River, Brazil (Kritscher, 1974). Lunaschi (1984) found it in the posterior intestine of the chameleon cichlid Cichlasoma facetum (Jenyns, 1842) (Pisces: Cichlidae) at 2 localities in Buenos Aires Province. Later, Zylber and Ostrowski de Nunez (1999) described the larval stages of L. jungwirthi from the gonad of Heleobia castellanosae (Gaillard, 1974) (Gastropoda: Hydrobiidae) collected in an artificial pond in Buenos Aires City. To date, the morphology of the larval (Zylber and Ostrowski de Nunez, 1999) and adult (Kritscher, 1974; Lunaschi, 1984) stages of this species is known only at the light microscopy level. Several investigators have described the tegumentary ultrastructure of adult aspidogastrids, such as Aspidogaster conchicola Baer, 1826 (Halton and Lyness, 1971), and Cotylogaster occidentalis Nickerson, 1902 (Ip and Desser, 1984). The variability of tegumentary sensory structures of the cotylocidia of C. occidentalis (Fredericksen, 1978), the development and growth of the ventral adhesive disc of C. Corresponding author. 249 occidentalis and A. conchicola (Fredericksen, 1980), and the sensory receptors of the larval stage of Lobatostoma manteri Rohde, 1973 (Rohde and Watson, 1989a, b, 1992), and Multicotyle purvisi Dawes, 1941 (Rohde and Watson, 1990b, c, d), were also studied. The aim of the present paper is to describe the tegumentary ultrastructure of juvenile and adult specimens of L. jungwirthi under scanning electron microscopy (SEM). Materials and Methods Parasites removed from the posterior intestine of C. facetum were identified as L. jungwirthi on the basis of the descriptions of Kritscher (1974) and Lunaschi (1984). Juvenile stages were found in the digestive gland of Heleobia parchappii (d'Orbigny, 1835) (Mollusca: Hydrobiidae), and adult specimens were obtained from the posterior intestine of C. facetum. Both host species were naturally parasitized by this aspidogastrid in Saladita Pond, Avellaneda District, Buenos Aires. The specimens were fixed in 10% formalin and washed in distilled water. They were dehydrated by 2 changes in 35, 50, 70, and 90% acetone for 15 min each and 3 changes in 100% acetone. The material was critical point dried, then mounted on stubs and coated for SEM observation (JEOL 100). The immature stage was named the postacetabular juvenile, following the nomenclature used by Fredericksen (1980). Two stages could be distinguished according to the development of the ventral adhesive disc: a recently formed postacetabular juvenile, with little differentiation of alveoli and the buccal opening Copyright © 2011, The Helminthological Society of Washington
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Volume 68 July 2001 Number 2 Former
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Comp. Parasitol. 68(2), 2001, pp. 1
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CRISCIONE AND FONT—DEVELOPMENT OF
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length did not exceed 1.2 mm. By da
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Agamidae) from Australia. Journal o
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infection with O. javaensis (C. D.
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CRISCIONE AND FONT—VARIATION OF O
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CRISCIONE AND FONT—VARIATION OF O
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and Font, 2001), the indication of
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U.S.A. (42°59'N; 88°21'W). Ten to
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Table 2. Prevalence (Pr) and Rana c
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transmission dynamics of these 3 tr
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196 in G. W. Esch, A. O. Bush, and
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filariae of S. fallisensis was simi
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CARRENO ET AL.—DEER PARASITES IN
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ange of host species, but most coll
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Oestridae). Canadian Journal of Zoo
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JOY AND TUCKER—SALAMANDER PARASIT
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south-central New York salamanders.
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AGUIRRE-MACEDO ET AL.—ENDOHELMINT
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Page 51 and 52: Table 1. Helminths found in freshwa
Page 53 and 54: •o d c o U rH CB 3 C8 H °Q 0 W T
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Page 59 and 60: JALISCO SALGADO-MALDONADO ET AL.—
Page 61 and 62: SALGADO-MALDONADO ET AL.—HELMINTH
Page 63 and 64: Table 3. Continued. Number of hosts
Page 71 and 72: tudio helmintologico de Chirostoma
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Page 75 and 76: CURRAN ET AL.—TWO VIETNAMESE SNAK
Page 77 and 78: methods of fixation had not been kn
Page 79 and 80: tion) but were in independent later
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Page 89 and 90: Literature Cited Baker, M. R. 1978.
Page 91 and 92: Figure 1. Spores of Myxobolus gibbo
Page 93 and 94: CONE—DIAGNOSIS OF MYXOBOLUS 239 F
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Page 113 and 114: , D. Iglesias, and B. Fried. 1986.
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Page 117 and 118: RESEARCH NOTES 263 Table 1. Helmint
Page 121 and 122: RESEARCH NOTES 267 Table 1. Numbers
Page 123 and 124: Kharchenko, V. A., G. M. Dvojnos, a
Page 125 and 126: id s „ ~ 55 **5 | «§ u ' *^ U
Page 127 and 128: (Nematoda). Except for H. tursionis
Page 129 and 130: RESEARCH NOTES 275 Figure 1. Cephal
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Page 135 and 136: ticeps (Rudolphi, 1819), which also
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Page 141 and 142: Adenomera hylaedactyla, 21 Algansea
Page 143 and 144: Honorary Membership, 282 Life Membe
Page 145 and 146: Schrankiana larvata, 21 Schrankiana
Page 147 and 148: *Edna M. Buhrer "Mildred A. Doss *
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