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Five new species of Acanthobothrium are described in stingrays from the Gulf of Nicoya, Costa Rica. Acanthobothrium costarricense n. sp. in Dasyatis longus, most similar to Acanthobothrium lilium, Acanthobothrium lineatum, and Acanthobothrium himanturi, has bothridial hooks averaging 125 microns (lateral) and 145 microns (medial) long, an average of 47 testes per proglottis, cirrus sacs averaging 187 microns long, and asymmetrical ovarian lobes with poral lobes reaching the posterior margin of the cirrus sac, and aporal lobes reaching the middle of the cirrus sac. Acanthobothrium cimari n. sp. in D. longus, most similar to A. lilium, A. lineatum, A. himanturi, A. costarricense, and Acanthobothrium semnovesiculum, has bothridial hooks averaging 117 microns (lateral) and 121 microns (medial) long, an average of 50 testes per proglottis, cirrus sacs averaging 164 microns long, and asymmetrical ovarian lobes with poral lobes reaching the posterior margin of the cirrus sac, and aporal lobes reaching the level of the vagina. Acanthobothrium puntarenasense n. sp. in D. longus, distinctive in having a very small scolex relative to the width of the cephalic peduncle similar to Acanthobothrium microcephalum, has bothridial hooks averaging 111 microns (lateral) and 117 microns (medial) long, an average of 50 testes per proglottis, cirrus sacs averaging 170 microns long, and asymmetrical ovarian lobes with poral lobes reaching the posterior margin of the cirrus sac, and aporal lobes reaching the middle of the cirrus sac. Acanthobothrium vargosi in D. longus, most similar to Acanthobothrium brevissime, Acanthobothrium tasajerasi, Acanthobothrium urotrygoni, and Acanthobothrium campbelli, has bothridial hooks averaging 130 microns (lateral) and 133 microns (medial) long, an average of 25 testes per proglottis arranged in 2 single rows, cirrus sacs averaging 91 microns long, and asymmetrical ovarian lobes with poral lobes reaching the posterior margin of the cirrus sac, and aporal lobes reaching the middle of the cirrus sac. Acanthobothrium campbelli n. sp. in Urotrygon chilensis, most similar to a A. brevissime, A. Vargasi, A. lineatum, A. himanturi, and A. urotrygoni, has bothridial hooks averaging 108 microns (lateral) and 111 microns (medial) long, an average of 19 tester per proglottis arranged in 2 nearly linear rows, cirrus sacs averaging 74 microns long, and asymmetrical ovarian lobes with the poral lobe reaching the posterior margin of the cirrus sac, and the aporal lobes reaching the middle of the cirrus sac.

Five New Species of Acanthobothrium Van Beneden, 1849 (Eucestoda: Tetraphyllidea: Onchobothriidae) in Stingrays from the Gulf of Nicoya, Costa Rica