Discobothrium caribbensis sp. n., a Lecanicephalidean Cestode ...


Discobothrium caribbensis sp. n., a Lecanicephalidean Cestode ...

Discobothrium caribbensis sp. n., a Lecanicephalidean Cestode from a Yellow-Spotted Stingray,Urolophus jamaicensis, in JamaicaAuthor(s): Scott Lyell Gardner and Gerald D. SchmidtSource: The Journal of Parasitology, Vol. 70, No. 2 (Apr., 1984), pp. 303-304Published by: The American Society of ParasitologistsStable URL: http://www.jstor.org/stable/3281881Accessed: 21/09/2009 15:13Your use of the JSTOR archive indicates your acceptance of JSTOR's Terms and Conditions of Use, available athttp://www.jstor.org/page/info/about/policies/terms.jsp. JSTOR's Terms and Conditions of Use provides, in part, that unlessyou have obtained prior permission, you may not download an entire issue of a journal or multiple copies of articles, and youmay use content in the JSTOR archive only for your personal, non-commercial use.Please contact the publisher regarding any further use of this work. Publisher contact information may be obtained athttp://www.jstor.org/action/showPublisher?publisherCode=asp.Each copy of any part of a JSTOR transmission must contain the same copyright notice that appears on the screen or printedpage of such transmission.JSTOR is a not-for-profit organization founded in 1995 to build trusted digital archives for scholarship. We work with thescholarly community to preserve their work and the materials they rely upon, and to build a common research platform thatpromotes the discovery and use of these resources. For more information about JSTOR, please contact support@jstor.org.The American Society of Parasitologists is collaborating with JSTOR to digitize, preserve and extend access toThe Journal of Parasitology.http://www.jstor.org

J. Parasit., 70(2), 1984, pp. 303-304? American Society of Parasitologists 1984DISCOBOTHRIUM CARIBBENSISP. N., A LECANICEPHALIDEANCESTODE FROM A YELLOW-SPOTTED STINGRAY,UROLOPHUS JAMAICENSIS, IN JAMAICAScott Lyell Gardner and Gerald D. SchmidtDepartment of Biological Sciences, University of Northern Colorado, Greeley, Colorado 80639ABSTRACT: Discobothrium caribbensisp. n. (Lecanicephalidea) is described from the spiral valve of the yellowspottedstingray, Urolophusjamaicensis from Jamaica. The new species is the only member of the genus describedwith four testes. It is most similar in number of testes to D. japonicum Yamaguti, 1934, which has six testesand a myzorhynchus. A myzorhynchus is absent in D. caribbensis.Five specimens of minute cestodes were foundin the spiral valve of a yellow-spotted stingray,Urolophus jamaicensis, collected at DiscoveryBay, Jamaica. They represent a new species andare described herein. Specimens were relaxed inseawater, fixed in AFA, and stained with Semi-Received 19 June 1983; revised 18 November 1983;accepted 18 November 1983.chon's carmine. All measurements are in micrometers.Discobothrium caribbensis sp. n.(Figs. 1-3)Description: With the characters of the genus Discobothriumsensu Dailey et Mudry 1968. Craspedote,apolytic. Number of segments 11 or 12; gravid segmentsnot present. Posterior margin of velum withsingle row of spines. Strobilia (n = 3) 629-883 (x =746 + 128) long by 63-96 (x = 87 + 6) maximumE2-.....?':f"'~"*"\.-'_ I .EE ~ ~ C)*,;;'~' E (0~~~~~1FIGURES 1-3. Discobothrium caribbensis sp. n. 1. Mature segment. 2. Scolex. 3. Entire worm.303

304 THE JOURNAL OF PARASITOLOGY, VOL. 70, NO. 2, APRIL 1984width in last segment (Fig. 3). Scolex (Fig. 2) length was added D. arrhynchum Brooks, Mayes, and(n = 3) 80-91 (x = 87 + 6) by 82-85 (x = 83 ? 2) Thorson,maximum width. Suckers circular (n =1980, from10) 28-37 (Jx =Myliobatis goodei, Uru-31 ? 4) long by (n = 9) 21-26 (c = 25 ? 2) wide. guay. Of these, only D. japonicum has fewer thanScolex covered with minute spines. Myzorhynchus ab- 10 testes. That species has six compared withsent. Four testes, each (n = 16) 19-46 (x = 31 ?+ 9)long, (n = four in D. caribbensis. Further, D. japonicum has16) 24-68 (c = 48 ? 13) wide, in one lon- a prominent, stalked myzorhynchus, the ovarygitudinal row in middle of segment (Fig. 1). Follicularis about one-third the distance from thevitellaria extending length of segment in two lateralposteriorbands. Ovary (Fig. 1) near posterior end of segmentend of the body, and the vitellaria are only aswith two lobes connected by anterior isthmus, (n = 4) anterior as the posterior testis. Clearly, D. carib-31-54 (c = 42 +? 11) long, (n = 4) 47-70 (x = 4 ? 11) bensis represents a previously unknown species.maximum width. Cirrus spinose. Cirrus sac (n = 4) 22- Discobothrium54 (c= 36 ? 13) long, (n= 4) 24-33 (x =aegyptiacus Hassen, 1982, is28 ? 4)wide. Genital pore always unilateral.22Genital atriumto 38 mm long, with 230 to 280 segments.(n = 3) 5-16 (xc = 10 ? 5) deep, (n = 3) 9-10 wide. We consider it to be a species of LecanicephalumTerminal segment (n = 4) 146-230 (x = 38 + 38) long, because of its large size.(n = 4) 63-89 (c = 83 + 14) wide.Type host: Urolophus jamaicensis (Cuvier), yellowspottedstingray.LITERATURE CITEDLocation: Spiral valve.BROOKS, D. R., M. A. MAYES, AND T. B. THORSON.Type locality: Discovery Bay, Jamaica.1980. Cestode parasites in Myliobatis goodei Gar-Holotype: USNM Helm. Coll. No. 77924.man (Myliobatiformes: Myliobatidae) from RioParatypes: USNM Helm. Coll. No. 77925.de la Plata, Uruguay, with a summary of cestodesEtymology: Named for the locality of discovery. collected from South American elasmobranchsduring 1975-1979. Proc. Biol. Soc. Wash. 93:REMARKS1239-1252.DAILEY, M. D., AND D. R. MUDRY. 1968. Two newspecies of Cestoda from California rays. J. Parasit.54: 1141-1143.HASSAN, S. W. 1982. Discobothrium aegyptiacus n.Dailey and Mudry (1968) noted four validspecies of Discobothrium: D. fallax Beneden,1870, from Raja clavata, Belgium; D. cobraeformisShipley and Hornell, 1906, from Aetiobatisnarinari, Sri Lanka; D. japonicum Yamaguti,1934, from Narkejaponica, Japan; and D. myliobatidisDailey and Mudry, 1968, from Myliobatiscalifornicus, California, USA. To this listsp. a cestode from Raja circularius in the MediterraneanSea, Egypt. J. Egypt. Soc. Parasitol. 12:169-173.YAMAGUTI, S. 1934. Studies on the helminth faunaof Japan. Part 4. Cestodes of fishes. Jap. J. Zool.6: 1-112.

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