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Acanthobothrium Nicoyaense N. Sp. (Eucestoda: Tetraphyllidea: Onchobothriidae) in Aetobatus Narinari (Euphrasen) (Chondrichthyes

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Acanthobothrium Nicoyaense N. Sp. (Eucestoda: Tetraphyllidea: Onchobothriidae) in Aetobatus Narinari (Euphrasen) (Chondrichthyes University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Faculty Publications from the Harold W. Manter Laboratory of Parasitology Parasitology, Harold W. Manter Laboratory of 4-1995 Acanthobothrium nicoyaense n. sp. (Eucestoda: Tetraphyllidea: Onchobothriidae) in Aetobatus narinari (Euphrasen) (Chondrichthyes: Myliobatiformes: Myliobatidae) from the Gulf of Nicoya, Costa Rica Daniel R. Brooks University of Toronto, [email protected] Sharon McCorquodale University of Toronto Follow this and additional works at: https://digitalcommons.unl.edu/parasitologyfacpubs Part of the Parasitology Commons Brooks, Daniel R. and McCorquodale, Sharon, "Acanthobothrium nicoyaense n. sp. (Eucestoda: Tetraphyllidea: Onchobothriidae) in Aetobatus narinari (Euphrasen) (Chondrichthyes: Myliobatiformes: Myliobatidae) from the Gulf of Nicoya, Costa Rica" (1995). Faculty Publications from the Harold W. Manter Laboratory of Parasitology. 222. https://digitalcommons.unl.edu/parasitologyfacpubs/222 This Article is brought to you for free and open access by the Parasitology, Harold W. Manter Laboratory of at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Faculty Publications from the Harold W. Manter Laboratory of Parasitology by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. J. Parasitol., 81(2), 1995, p. 244-246 ? American Society of Parasitologists 1995 ACANTHOBOTHRIUMNICOYAENSE N. SP. (EUCESTODA:TETRAPHYLLIDEA: ONCHOBOTHRIIDAE) IN AETOBATUSNARINARI (EUPHRASEN) (CHONDRICHTHYES:MYLIOBATIFORMES: MYLIOBATIDAE) FROM THEGULF OF NICOYA,COSTA RICA Daniel R. Brooks and Sharon McCorquodale Department of Zoology, Universityof Toronto, Toronto, Ontario,Canada M5S 1A1 ABSTRACT: A new speciesof Acanthobothrium in Aetobatus narinari from the Gulf of Nicoya, CostaRica, most closely resembles Acanthobothrium colombianum in the same host and A. urotrygoni in Urotrygon venezuelae from Cartagena, Colombia, by having relativelyfew proglottidesper strobila,spinose cephalicpeduncles, bothridial margins free at their posteriorends, and irregularly shaped ratherthan sphericalor elongate cirrus sacs. Acanthobothriumcolombianum differs from the new species by being as much as 35 mm ratherthan no more than 4.7 mm long and by having 31-48 ratherthan 13-19 proglottides,an averageof 46 ratherthan 15 testes per proglottis,and bothridialhooks averaging185 ,um rather than 137 ,m in total length.Acanthobothrium urotrygonidiffers from the new species by being as much as 15 mm ratherthan no more than 4.7 mm long and by having V-shaped ratherthan H-shaped ovaries, bothridialhooks averaging95 Mmrather than 137 um in total length, by having an averageof 28 ratherthan 15 testes per proglottis,and by having poral ovarianarms extendinganteriorly to the posteriormargin of the cirrussac and aporalarms extendingto the lateralmargin of the cirrussac. The Spotted Eagle Ray Aetobatus narinari (Euphrasen) occurs Cephalicpeduncle 244-525 (330) long, spinose. Terminalproglottides commonly in mangrove swamps throughout the tropical regions 710-1,261 (932) long by 238-463 (321) wide. Genital pores alternating in anterior27-44% of in of the world. Included in the list of parasites reported previously irregularly (34%) proglottis,protruding largest proglottides.Cirrus sac irregularlyshaped, 105-163 (142) long by 71- in A. narinari are 3 species of Acanthobothrium van Beneden, 114 (92) wide at genital pore, containinghighly muscularspined ever- 1849. During a preliminary study of the parasite biodiversity sible cirrusand convolutedinternal seminal vesicle. Vas deferenscoiled of Cosa Rican elasmobranchs, we discovered a previously un- anteriorlyto terminalgenitalia. Testes 14-32 (22) in diameter, 12-22 described species of Acanthobothrium inhabiting A. narinari in (15) in number;3-6 (5) preporally,1-4 (2) postporally,and 7-15 (8) antiporally. Ovary in frontal view, 194-416 (300) long, the of the northern Gulf of H-shaped mangrove swamps Nicoya. x-shapedin cross section. Ovarianarms rarelyextending anteriorly to posteriormargin of cirrussac, generallyposterior to posteriormosttes- MATERIALSAND METHODS tes. Vaginaopening anterior to cirrussac; prominentsphincter present. Vitelline follicles 5-17 in in 2 lateral were collected in mid-afternoonat low tide a beach (10) diameter, extending single Stingrays using rows from immediatelypostovarian to immediatelyposterior to ante- seine stretchedacross a channel leading from a mangrove stand into riormosttestes. the main channel of the Gulf of Cestodeswere relaxedin sea Nicoya. Host: Aetobatusnarinari (Euphrasen) (Chondrichthyes: Myliobati- water, killed in a relaxedcondition with hot water, fixed immediately formes: with Myliobatidae). with AFA and storedin 70%ethanol. Whole mounts were stained Site valve. Serialcross sections of and scoleces of infection: Spiral Mayer'shematoxylin. proglottides Locality: Punta Morales,Golfo de Nicoya, Costa Rica. were cut 7 MAmthick, stained with Mayer'shematoxylin and counter- USNM Helm. Coll. no. 84477. stained with eosin. Whole mounts and cross sections were mounted in Holotype: Paratypes: USNM Helm. Coll. no. 84388; MNHG no. 18255. Canadabalsam. All measurementsare in Mmunless otherwisenoted. The is named for the Golfo de Costa Helm. Coll. refers to the U.S. National Museum Helmintho- Etymology: species Nicoya, USNM Rica, where it was first discovered. logical Collection, Beltsville, Maryland;MNHG refersto the Museum of NaturalHistory, Geneva, Switzerland. DISCUSSION Acanthobothrium nicoyaense n. sp. Three species of Acanthobothrium have been reported pre- (Figs. 1-4) viously from Aetobatus narinari. Two of those species, A. ae- Description(based on 13 completeand 3 incompletespecimens; mean tiobatis (Shipley, 1900) Yamaguti, 1959 and A. tortum Linton, values in parentheses):Strobila acraspedote, apolytic, consisting of 13- 1916, are readily distinguished from A. nicoyaense by virtue of mm Scolex 294-369 19 (16) proglottides,2.55-4.73 (3.56) long. (316) being larger worms (A. aetiobatis is 15-30 mm long, A. tortum wide, composed of 4 trilocularbothridia each armed with pair of bifid is 35-205 mm more than 100 hooks and surmountedby apical sucker and pad. Bothridia 340-431 long), having proglottides, square (397) long by 106-181 (144) wide; anteriorloculus 200-269 (235) long, rather than elongate proglottides, foliose and relatively flat rath- middle loculus 56-81 (67) long, posterior loculus 81-116 (92) long. er than compact and elongate ovaries, bothridial margins fused Averageratio of locularlengths 1:0.3:0.4.Apical suckers57-71 (64) in to the scolex rather than free at their posterior ends, and both- diameter.Hook formula from Euzet to include mean (modified [1959] ridial hooks averaging 250 or more; in addition, A. tortum values) for 118 hooks: tim has an average of 163 testes per proglottis, and A. aetiobatis has 29-51 86-116 69-108 (42) (68) (90) an average of 25 testes per proglottis. Acanthobothrium col- 119-157 (137) ombianum Brooks and Mayes, 1980, from Cartagena, Colom- bia, resembles A. nicoyaense by having spinose cephalic pedun- cles, bothridial margins free at their posterior ends, H-shaped Received 15 June 1994; revised 15 September 1994; accepted 15 ovaries with arms not extending anteriorly to the posterior mar- September1994. gin of the cirrus sac, and irregularly shaped rather than spherical 244 BROOKSAND MCCORQUODALE-NEWCESTODE FROM COSTA RICANSTINGRAY 245 1 2 3 FIGURES1-4. Acanthobothrium nicoyaense, holotype. 1. Sl cale bar = 150 fm. 2. Enlargement ofbothridial hooks. Scale bar = 75 Am. 3. Enlargement of terminal genitalia. Scale bar = 75 ,um. 4. Terminal attached proglottis. Scale bar = 150 ,m. 246 THEJOURNAL OF PARASITOLOGY, VOL. 81, NO.2, APRIL1995 or elongate cirrus sacs. Acanthobothrium colombianum differs per proglottis. Only A. quadripartitum Williams, 1968, with 18 from the new species by being up to 35 mm long rather than testes per proglottis and A. tripartitum Williams, 1969, with 13- no more than 4.7 mm long, by having 31-48 rather than 13- 16 testes per proglottis, both in skates (Raja spp.) from the North 19 proglottides, an average of 46 rather than 15 testes per pro- Atlantic Ocean, and A. parviuncinatum Young, 1954, with 12- glottis, and bothridial hooks averaging 185 ,tm in total length 14 testes per proglottis, in stingrays (Urolophus and Gymnura) rather than 137 ,tm in total length (Brooks and Mayes, 1980). from the coast of California, possess numbers of testes per pro- Acanthobothriumlineatum Campbell, 1969 in Dasyatisamer- glottis similar to A. nicoyaense, but they all possess bothridial icana from the Chesapeake Bay, Virginia resembles A. nicoy- hooks less than 100 u,m in total length and differ in a variety of aense by being relatively small, with a maximum reported length other characters. The second feature is the predominantly preo- of 6.1 mm compared with 4.7 mm for A. nicoyaense, and by varian distribution of testes, a trait exhibited also by A. coron- having spinose cephalic peduncles, bothridial margins free at atum (Rudolphi, 1819) van Beneden, 1849, A. indicum Sub- their posterior ends, relatively few proglottides (6-19), H-shaped hapradha, 1955, and A. mathiasi Euzet, 1956, species that do ovaries, ovarian arms about equal in length extending anteriorly not resemble each other or A. nicoyaense in any other significant to, or nearly to, the posterior margin of the cirrus sac, and an traits. irregularly shaped cirrus sac. It differs from A. nicoyaense by having bothridial
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