New Species of Acanthobothrium (Cestoda: Tetraphyllidea) from ...

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New Species of Acanthobothrium (Cestoda: Tetraphyllidea) from ...

CAMPBELL-NEW SPECIES OF ACANTHOBOTHRIUM FROM CHESAPEAKE BAY 569many species of Acanthobothrium may beutilizing many of the same intermediate hostscommon to the diets of the definitive hosts.Except for the work of Reichenbach-Klinke(1956) little information is at hand relative tothe relation between commonly reported"Scolex pleuronzctes" Miiller, 1788, and particularadults. Although host specificity is impliedfor elasmobranch cestodes there is noexperimental evidence to indicate whether aparticular species of Acanthobothritim from astingray is capable of infecting a skate or evena shark.In view of the increasing number of describedspecies of Acanthobothritim and becauseof the overlapping of diagnostic characteristics(testes number, hook measurements,etc.) one suspects that host-induced modificationsmay be involved. Unless experimentalwork is done this genus will soon be subjectto the taxonomic confusion exemplified by thegenus Hymenolvpis and others. That hostinducedmodifications are known to ocur hasbeen shown experimentally in trematodes byWatertor (1967), and in cestodes by James(1968). To consider host and locality dataas valid taxonomic criteria for differentiatingspecies of Acanthobothritim seems to be premature.An extensive and critical review ofthe genus based on experimental work, extensivecollections, examination of type specimens,and knowledge concerning the zoogeographyof the hosts involved is, therefore, essential.Key to species of Acanthobothriumfrom the western north Atlantic1. ( a) Postvaginal testes present ...................... 2 ( b ) Postvaginal testes absent ........................ ........................ A. foeeli Goldstein. 1964, -2. (a) Postvaginal testes 12 or less .................. 3 (b) Postvaginal testes 17 or more ................ 7 3. (a) Postvaginal testes 3 * l;*total hooklength 115 t 11 ...................................................... A. brevissime Linton, 1908(b) Postvaginal testes 5 to 10; total hooklength 140 or more .......................... 44. (a) Prevaginal testes about 9, usually tandemin arrangement ............................ 5(b) Prevaginal testes about 11 to 21, nottandem in arrangement ...................... 65. (a) Cirrus pouch in mature segments about198 long by 129 wide .............................................................. A. lineatum sp. n.* Mean value and the standard deviation. Alltestes numbers based on mature segments; hookmeasurements based on adult worms.(b) Cirrus pouch in mature segments about53 long by 39 wide .................................................... A. lintoni Goldstein, 19686. (a) Prevaginal testes about 11 to 14;T totalhook length 152 t 18 .................................................. A, paulum Linton, 1890(b) Prevaginal testes about 17 to 21; totalhook length 108 t 13 ..........................................A. floridensis Goldstein, 19647. (a) Prevaginal testes about 21;: total hooklength 200 or more .................................................... A. tortum ( Linton, 1916)(b) Prevaginal testes 12 t 2; total hooklength, 180 or less .............................................................. A. americanum sp. n.Acanthobothriztm u;oodsholei Baer, 1948: incertaesedis.i. Reevaluation of A. tortum has shown testesnumbers to be much greater. Redescription willbe presented elsewhere.ACKNOWLEDGMENTSI wish to express my appreciation to Dr.William J. Hargis, Jr., for the privilege ofusing the facilities of the Virginia Institute ofMarine Science; Dr. Newton R. Kingston,University of Wyoming, and Messrs. David E.Zwerner and Adrian R. Lawler of the Institutefor aid in collection and identification ofhosts; Dr. Robert J. Goldstein, Emory University,for aid in identification and donationof specimens from his collection; Dr. R. Martinand personnel of the Stazione Zoologica diNapoli (Naples, Italy) for use of laboratoryfacilities and aid in obtaining material forcomparison; and Dr. Martin J. Ulmer, IowaState University, for suggestions and criticismconcerning preparation of the manuscript. Thisstudy was supported in part by NSF grantGB5465X1 (under the direction of Dr. MartinJ. Ulmer).LITERATURE CITEDBAER,J. G. 1948. Contributions A l'ktude descestodes de sklaciens. I-IV. Bull. Soc. Sci.Nat. NeuchLtel 71: 63-122., AKD L. EUZET. 1962. Revision critiquedes cestodes tktraphyllides dkcrits par T.Southwell. Bull. Soc. Sci. Nat. NeuchLtel 85:143-172.BEAUCHAMP, P. M. DE. 1905. fitudes sur lescestodes des sklaciens. Arch. Parasit. 9: 463-539.GOLDSTEIS, R. J. 1964. Species of Acanthobothrium(Cestoda: Tetraphyllidea) from theGulf of Mexico. J. Parasit. 50: 656-661.. 1967. The genus Acanthobothrium VanBeneden, 1849 (Cestoda: Tetraphyllidea). J.Parasit. 53: 455-483.

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