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Journal of the Helminthological Society of Washington 62(1) 1995

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Journal of the Helminthological Society of Washington 62(1) 1995 Volume 62 5, A semiannual journal of research devoted to Helmintholbgy^hd all branches of •Parasitology ' •;, y <_ Supported m part by the _ : / c BraytOn H. Ransom MemorialTrust Fund THOMAS, D. M., N.L.STANTON, AND'R/S. SEVILLE. A StableJEimerian Assemblage in --f_ WyomingcGround Squirrels (Spermophilus elegans elegaiis): Maintaining ^Visibility X / . overWinter- ..^.— ..... ... —.— ..—::—-.-„—1 _>.~~.~~ - _.,] "T' '/• , D. K., J. R. ARTHUR, AND M. G. BONDAD-REANTASO. 'Description of Two New Species of Gyrodactylus von Nordmann, 1832 (MonogeneaX^ftom Cultured Nile Tilapia, Tilapia nilotica (Cichlidae), in the Philippines....^.....L.~..............^.....-^ 6 D. G. Dactylogyi'us greenei.sp. n. (Klonogenea: vDactylogyridae).from xi Ihe Wedgespot Shiner, Nolropis greenei Hubbs and Ortenburger (Pisces: ^ ; (Cyprinidae)—— - *•__ —...—£ ..'.... ._ ^-^w^£^__: 1'6- DYER, W-G.,E. H/WILLIAMS, JR., L. BUNKLEY-WILLIAMS,ANDD^MOORE. SomeDi- > •'' , geneans (TrematodaX of the Atlantic Jiawksbill Turtle, Eretmochelys imbricata ^imbricaia (Testudines: Cheloniidae) from Puerto Rico .1...^....^..^. ... 13 .., DRONEN, N. O., Z. N. HOMESLEY, AND A. G. CLEVELAND. Niviventertrema yunnanen- _- - 1 ' ^;. ^sis!gen. -n.^ sp.-n:7(tecithodendriidae: Pleurpgenetinae), from Niyiveiiter^cre-*-— . mdriventer (}A\\ri&&&) from Yunnan Province of the Peoples Republic of Cnina 18 .C CAJRA, J. N. AND_D. J. ORRINGER. Additional Information on the Morphology of "- Potaniotrygonocestus magdalenensis (Tetraphyllidea; \Qnchobothriidae) from '-'- " '^the Freshwater Stingray Potanwtrygon mqgdalenae~in Colombia ;-...,—.. „- -22 HASEGAWA, H. AND-SYAFRUDDIN. ! Nematode Fauria,of the Two Sympatric Rats Rat- / tus/rattus-and R. exulans, in Kao District, Halmahera Island, Indonesia .T:.l :. 27 ^' - PURNOMO AND M. J. BANGS. - Microfilaria sundaicus, sp. n., a Chabfilaria-like. Para- , v site (Filarioidea: Onehocercidae) from the Blood Ofihe Horseshoe Bat (Rhinolo- plws affinis) inTldres, Indonesia.— .— ——.:.....;...„—.-...„..-. , l._T_. ;X !-32^-- . DIJNAGAN.T. T. AND^S. SrHMiTT. Structural Evidence.for Sensory Function in^the \ Apical ©rgari of Macracanthorhynchus.hirudmaceus (Acantho,cephalaX-=-.—- 35 '".. x. • -~ ~: , ' (Continued on Outside Back Cover)'— " " -. ^ Copyright © 2011, The Helminthological Society of Washington THE SOCIETY meets in October, November, February, April and May for the presentation and dis- cussion of papers in any and all branches of parasitology or related sciences. All interested persons are invited to attend. • > ~ " ;• _ " . Persons interested in membership in the Helmihthological Society ofWashington may obtain appli- "catien blanks in recent issues of THE JOURNAL. -A year's subscription to the Journal is included in the annual 'dues of $20.00 domestic and $22.00-fofeign._) >..; President: JQAN E. JACKSON Vice President: SUSAN FRICKE-MEYER Corj-e spending Secretary-Treasurer. HARLEY G: SHEFFIELD v ----•," _ 'V - Recording Secretary: MICHAEL J. BANGS C Archivist/Librarian: PATRICIA A. PILITT - Custodian of Back Issues:: 1 RALPH LICHTENFELS Representative to the Washington Academy of Sciences: KEND ALL G. POWERS N ',^_-I;.,"- , - Representative to the American Society of Parasitologists: ERIG-'P. HOBERG , Executive Committee Members-at-Largt: JOHNH. CROSS, 1995 / ,y ,':>v SUS AM MEYER, 1994 - ;/ ~.f' '• ^~ ' , Immediate Past President: MARKC. JENKINS -. , , ' - ' ^ . ''•• ^ THE JOURNAL OF THE HELMINTHOLOGICAL SOCIETY OF WASHINGTON THE JOURNAL is published semiannually at LawrencerKansas by the Helminthological Society "of Washington. Papers need not be presented at a meeting to be published in the Journal, s „ MANUSCRIPTS should be sent to the EDITOR, Sherman S. Hendrbc, Department of Biology, Get- tysburg College, Gettysburg, PA 17325. email: [email protected]. Manuscripts must be -typewrittenrdouble spaced, and in/finished form. Consult recent issues of the Journal for format ,and style. The original and two.copies are required. Photocopies of drawings may be submitted for review purposes but glossy prints of halftones are required; originals will be requested after acceptance of the manuscript. Papers are accepted with.the understanding that they will be published only in the Journal- ' REPRINTS may be ordered from the PRINTER at the same time the corrected proof is returned to the EDITOR. ' ' '-; _ -AUTHORS' CONTRIBUTIONS to publication costs (currently:$40/pg for members, $80, for non- members)Will be billed by Allen Press and are payable to the SOCIETY. 'BACK VOLUMES of the Journal are available. Inquiries Concerning back volumes and current sub- scriptions should be directed to the business office. ' ; N .''-T^-'' N BUSINESS^OFFICE. The^Society's business office is at Lawrenc6, Kansas: AH inqiriries^concern- ing subscriptions or back-issues'ahdI all payments for dues, subscriptions, and back issues should be addressed to: Helminthological Society of Washington, % Allen Press^Inc., 1041 New Hampshire St., Lawrence, Kansas 66044, U.S.A. ----- '/. ~?"' . SHERMAN S. •HENDRIX, Editor ;: ./ 1995 1996 . DANIEL R. BROOKS •' - D WIGHT DV BOWMAN ROY.C. ANDERSON ERIC P. HOBERG ,L/ RAYMOND-H. FETTERER RALPH-.P. ECKERLIN. ROBIN M. OVERSTREET WILLIAM F. FONT ,• '. RONALD PAYER 1VIARY H. PRITCHARD JOHN C. HOLMES A. MORGAN GOLDEN ROBERT L. RAUSCH U J. RALPH LICHTENFJBLS - ROBIN N. HUETTEL HARLEY G. SHEFFIELD JOHN S. MACKIEWICZ FAUDM.NAHHAS DENNIS A. THONEY .,' BRENT B.NICKQL 'DANNYB. PENCE . STEVE J.UPTON VASSILIOS THEODORIDES , JOSEPH F. URBAN © The Helminthological Society of Washington 1995 r ' ISSN 1049-233X © This paper meets the requirements of ANSI/NISO Z39.48-1992 (Permanence of Paper). Copyright © 2011, The Helminthological Society of Washington J. Helminthol. Soc. Wash. 62(1), 1995, pp. 1-5 A Stable Eimerian Assemblage in Wyoming Ground Squirrels (Spermophilus elegans elegans): Maintaining Viability over Winter DIANE M. THOMAS,' NANCY L. STANTON,' AND ROBERT S. SEVILLE2 1 Department of Zoology and Physiology, Box 3166, University of Wyoming, Laramie, Wyoming 82071-3166 and 2 U. W. Casper Center, 125 College Drive, Casper, Wyoming 82601 ABSTRACT: A stable assemblage of 3 uncommon (prevalence < 20%) and 3 common (prevalence > 45%) species of Eimeria (Apicomplexa: Eimeriina) is known to infect Wyoming ground squirrels (Spermophilus elegans elegans). Several factors may contribute to the prevalence stability including host immune response, parasite- parasite interactions, and oocyst survival under ambient environmental conditions. To determine the effects of various environmental conditions on 3 of these eimerians, oocysts of 1 uncommon (E. larimerensis) and 2 common (E. beecheyi and E. callospermophili) species were placed into 6 treatment groups and sampled monthly over winter. Treatments included ambient temperature (sun, shade, and subsoil) and constant 8°C temperature (moistened with 2% potassium dichromate or water, or allowed to desiccate). After 6 mo, oocysts from each treatment were administered to uninfected squirrels (2 squirrels per treatment group). Although all oocysts examined appeared grossly abnormal when examined microscopically, all 12 squirrels developed patent infections of E. larimerensis and E. callospermophili, and 11 of 12 developed infections of E. beecheyi. All 3 eimerian species maintained viability under conditions of severe desiccation, ultraviolet radiation, and repeated freezing and thawing. It is likely that resistance to harsh environmental conditions plays an important role in the maintenance of this parasite assemblage. KEY WORDS: coccidia, Eimeria, overwintering, transeasonality. A stable assemblage of 6 eimerian species has eimerian assemblage meets the criteria for Level been described in Wyoming ground squirrels 2 stability, because all 6 species are present over (Spermophilus elegans elegans (Kennicott, 1863)) time and prevalences remain constant from spring and has been found in all populations of Wyo- emergence through the squirrels' active season ming ground squirrels sampled to date (Shults et (Seville, 1992). The purpose of this study was to al., 1990; Stantonetal., 1992). Furthermore, sev- examine oocyst survival and viability under ex- eral of these eimerian species have been found perimental and field conditions and to determine in sciurid species sympatric with the Wyoming whether or not overwinter survival of eimerian ground squirrel (Shults et at., 1990; Seville et al., species may contribute to the stability of this 1992). Three species (Eimeria larimerensis (Vet- host-parasite system. terling, 1964), E. spermophili (Hilton and Mahrt, Several strategies for overwintering are pos- 1971), and E. bilamellata (Henry, 1932)) occur sible. Eimeria spp. may avoid harsh conditions at prevalences of less than 20% and may elicit through extraintestinal stages harbored in hosts some degree of immunity in Wyoming ground (Fernando et al., 1987; Perry and Long, 1987; squirrels (Thomas et al., 1992). The remaining Ball et al., 1989; Ball et al., 1990) or in prolonged 3 species (E. beecheyi (Henry, 1932), E. callo- or arrested infections in hibernating animals spermophili (Henry, 1932), and E. morainensis (Anderson, 1971). Furthermore, harsh condi- (Torbett, Marquardt, and Carey, 1982)) occur at tions may be moderated in microclimates be- prevalences of 45-75% and can repeatedly rein- neath the soil surface (i.e., in burrows or after feet individual squirrels (Seville, 1992). Rahel burial of squirrel fecal pellets by dung beetles [T. (1990) proposed 3 levels of stability. At the high- Wingert, pers.
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