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Two New Species of Acanthobothrium in Narcine entemedor (Rajiformes: Narcinidae) from the Northwest Coast of Guanacaste Peninsula, Costa Rica

Fernando Marques, R. Centritto and S. A. Stewart
The Journal of Parasitology
Vol. 83, No. 5 (Oct., 1997), pp. 927-931
DOI: 10.2307/3284291
Stable URL: http://www.jstor.org/stable/3284291
Page Count: 5
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Two New Species of Acanthobothrium in Narcine entemedor (Rajiformes: Narcinidae) from the Northwest Coast of Guanacaste Peninsula, Costa Rica
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Abstract

This paper describes 2 new species of acanthobothrium collected in Narcine entemedor from Cuajiniquil, Guanacaste Province, Costa Rica (10° 57′N, 85°42′W). Acanthobothrium franus n. sp. averages 27 mm long, composed of 110 proglottides, has bothridial hooks 344-469 (µm long, and 24-56 testes per proglottis. This new species resembles Acanthobothrium colombianum, Acanthobothrium coquimbensis, Acanthobothrium dujardini, Acanthobothrium lineatum, Acanthobothrium lintoni, and Acanthobothrium paulum. The new species differs from these 6 species by having a relatively shorter cirrus sac length not reaching the middle region of the proglottis. Additionally, A. franus differs from these species by having longer bothridia (627-1,408 µm vs. 299-391 µm for A. colombianum, 312-480 µm for A. coquimbensis, 240-560 µm for A. dujardini, 275-624 µm for A. lineatum, 389-720 µm for A. lintoni, and 300-880 µm for A. paulum), and larger bothridial hooks (344-469 µm vs. 175-193 µm, 120-192 µm, 180-210 µm, 118-216 µm, 108-230 µm, and 104-229 µm, respectively). Acanthobothrium inbiorium n. sp. averages 59 mm long, composed of 198 proglottides, has bothridial hooks 95-120 µm long, and possesses 44-73 testes per proglottis. Among species of Acanthobothrium, the new species resembles Acanthobothrium electricolum, Acanthobothrium dasybati, Acanthobothrium dighaensis, Acanthobothrium icelandicum, A.canthobothrium indicum, Acanthobothrium microcephalum, and Acanthobothrium wedli. The new species closely resembles A. dasybati, but differs from that species in average strobila length and number of proglottides (58 µm long and 198 proglottides in A. inbiorium vs. 20 and 80 in A. dasybati, respectively). The new species can be distinguished from A. electricolum by having a wider scolex (450-900 µm vs. 189-252 µm), from A. dighaensis by having a narrower scolex (450-900 vs. 1,050-1,429), and from A. indicum by average strobilar length and number of proglottides (58 mm and 198 for A. inbiorium vs. 25 mm and 145 for A. indicum). Finally, A. inbiorium differs from A. icelandicum by having a shorter cirrus sac (122-285 for A. inbiorium vs. 380-410 for A. icelandicum), and A. microcephalum and A. wedli by having longer bothridia (an average of 603 µm vs. 447 µm for A. microcephalum and 350 µm for A. wedli), and fewer testes per proglottis (44-73 vs. 105-115 and 80-100, respectively). Morphological similarities suggest that some components of the eastern Pacific fauna of Acanthobothrium might share historical associations with the Caribbean and the western Pacific/Indian Ocean fauna.

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