Number 1 A semiannual journal of research devoted to Helminthology and all branches of Parasitology ,V.' ' ••:!•-"('''•••': <•/ 'W'' : ,.-.>. •; v'' '•'.;>. Supported in part by the 'BraytonH. Ransom Memorial Trust Fund , •,,. ^CONTENTS -.,.,;/.,; , , '.^\, J ;; RADOMSKI, A. A., D. A. OSBORN, D. B. PENCE, M. /Il NELSON, AND R. J. ,-' , WARREN. Visceral helminths from an expanding insular, population of the long- nosed .armadillo (Dasypus noverricinctus) r. „ _......^»;..r..,....._ _..,.....' 1 ' KRrrSKY, D. C. AND W. A. BOEOER, Neoiropical Monpgenea. 16. New species of oviparous Gyrodactylidea with proposal of Npthogyrodactyltis gen. n. (Oogyro- dactylidae) ....:..i..._! . , ..._.-_..._..._^ ..__^. „ '7 GARDNER, S; L., S.J. UPTON, C. R. LAMBERT, AND O. C. JORDAN. Redescription of ' lEimeria ^come/r(Rastegaieff, 1930) from Myrmecopftaga tridactyla, and a first report from Bolivia ,T . „.. .„. .„„.. !...„._ ._.^<. „ 116 TELFORD, S. R., JR., D. J. FORRESTER, S. D. WRIGHT, M. E. ROELKE, S. A. FERENC, AND J. W.^McCowN. The identity and!prevalence of trypanosomes jn white- tailed deer (Odocoileus virginianus) from southern Rorida ,„ „_._._ _. .„„„ 19 FONT, W. F. Life cycle ofAmphimerus elongatus (Trematoda: Opisthorehiidae). .. 24 MADHAVI, R. AND U. SHAMEEM. Cercaria chilkaensis II, a new zoogonid cercaria \ from the snail, Nassarius orissaensis, from Chilka.Lake, India .:....c. .\^.-. 2\\, !T. AND T. KIFONE. Anapfilaeorchis hamajimai gen. et sp. n. (Trematoda: Monorchjidae) from the loach, Cobitis ibiwae, in Japan _... J . .__. 35 Cox, W. T. ANDiG. L. HENDRICKSON. Observations on the life cycle of Proteocephalus : , tumidocollus (Cestoda: Proteocephalidae) in steelliead trout, Onchorhynchus my- kiss .._._»lL.^___...i.. ..;^:^...... 1 ... ..^...:.»..^....^.., ^__._mll!._,_:^_ 39 GSrrwooD, D. J. AND W. ,R. LUSBY. Sterol composition of the qorn root lesiori ''-- nematode, Pratylenctius agilis, and corn root cultures .... : „ . _^.._ 43 (Continued)on Outside Back Cover) Copyright © 2011, The Helminthological Society of Washington THE HELMINTHOLOGICAL SOCIETY OF WASHINGTON ,.:, \ THE SOCIETY meets once a month from October through May foMhe presentation and discussion - ^ of papers in any and all branches of parasitplogy-or Delated sciences. All interested persons are invited ... .to attend. ' j y; > /» .^' ., "•• •_ • \. Persons Interested in .membership in the Helminthological Society 'of Washington may obtain application blanks in recent issues of THE JOURNAL. A year's subscription to the Journal is included in the annual dues. , /, , /, •''"' ''.- ( .\ '-vV.' "'(••.''•'""''• ,/>vv' ,/<.'••' ",:.-' : 7- —v,- " • - ;'^V • i v, . -,.:,. •' ' '• ^'~':'i ;-,'! V. / OFFICERS OF THE SOCIETY FOR 1991' /.'.'' ^ "; '. President: NANCY £>. PACHECO ' * \ r-; ?• ~ Vice President: ;RUTH M. 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RALPH LICHTENFELS ROBIN N. HUETTEL ROBERT L. RAUSCH JOHN S. MACKIEWICZ '•> DANNY B. PENCE HARLEY G. SHEFFIELD BRENT B. NICKQL \. JOSEPH F. URBAN , x, > DENNIS A: THONEY VASSIL1OS THEODORIDES The Helrninthblogieal Sqciety of Washington 1991 ' .- -"• v;\ ' '. ••:.v./ • ' " i' . \N 1049-233X THIS PUBLICATION IS PRINTED/ON AC|b-FREE PAPER. Copyright © 2011, The Helminthological Society of Washington J. Helminthol. Soc. Wash. 58(1), 1991, pp. 1-6 Visceral Helminths from an Expanding Insular Population of the Long-nosed Armadillo (Dasypus novemcinctus) ANDREW A. RADOMSKi,1 DAVID A. OsBORN,1 DANNY B. PENCE,2-4 MARTIN I. NELSON,3 AND ROBERT J. WARREN3 1 Department of Range and Wildlife Management, Texas Tech University, Lubbock, Texas 79409, 2 Department of Pathology, Texas Tech University Health Sciences Center, Lubbock, Texas 79430, and 3 School of Forest Resources, The University of Georgia, Athens, Georgia 30602 ABSTRACT: Long-nosed armadillos (Dasypus novemcinctus) (N = 117) from Cumberland Island, Georgia were infected with encysted cystacanths of Macracanthorhynchus ingens and Centrorhynchus sp. and larvae ofPhysa- loptera sp. Ninety-five, 56, and <3% of the hosts had 1, 2, and 3 species of helminths, respectively. The frequency distribution pattern of each helminth species was aggregated; overdispersion was homogeneous across host sex and season variables. Abundances of all helminth species collectively, and Physaloptera sp. individually, were significantly greater in the warm versus cool seasons. As a corollary to Brown's (1984) theory, we propose that a host population at the periphery of its geographic range may have fewer species and lower abundances of helminths and/or lack a defined helminth community when compared to a conspecific population at the host's epicenter of origin. This may partially explain why a community of species of adult helminths has not developed in the recently colonized population of armadillos on Cumberland Island. Other reasons for this vacant niche may include (1) the unique physiology of armadillos may preclude them as a suitable definitive host for helminths already on the island; (2) there are no other related hosts on the island with a community of helminth species that could infect the armadillo; and (3) the founders of this armadillo population were not infected prior to colonizing the island. KEY WORDS: Brown's theory, Dasypus novemcinctus, geographic barrier, helminth community ecology, hel- minth survey, host colonization, insular host population, long-nosed armadillo, range periphery, physiological barrier, unsuitable host, vacant niche. The range of the long-nosed armadillo (Das- the long-nosed armadillo recently has colonized ypus novemcinctus Linnaeus) extends from the a large area in the southeastern United Slates, southern United States through Mexico and Cen- the few helminth surveys indicate that the in- tral America into South America as far south as vading population has only a fraction of the hel- Uruguay (McBee and Baker, 1982). Armadillos minth species (Taber, 1945; Chandler, 1946, were first reported in the United States in 1854 1954) reported in this host from its native range from southern Texas (Bailey, 1905). Subsequent- in Central and South America. ly, they have expanded their range northward Although islands are favored study-sites of and eastward from the Texas population and ecologists, there are few studies (Kisielewska, northward from expanding populations intro- 1970) on the acquisition of helminths by invad- duced in Florida in the early 1920's (Cleveland, ing insular vertebrate hosts. Specimens collected 1970). Active invasion at a rate of 4—10 km/yr in conjunction with other studies on the long- has extended the present distribution of arma- nosed armadillo population of Cumberland Is- dillos from central Kansas eastward to South land, a barrier island on the coast of Georgia, Carolina (Humphrey,