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A new genus and two new species of trypanorhynch cestodes (Tentaculariidae) from the sharks Carcharhinus sorrah (Müller & Henle) and Sphyrna lewini (Griffith & Smith) from off the coasts of Malaysia and Mexico

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Abstract

Two new tentaculariid species were found infecting carcharhiniform sharks from off the coasts of Malaysian Borneo and the southwestern coast of the Baja California Sur, Mexico. Both new species exhibit a homeoacanthous heteromorphous basal and a homeoacanthous homeomorphous metabasal armature. Since this hook arrangement is unique within the tentaculariids and the taxonomy in this group deeply depends on the tentacular armature, Reimeriella n. g. is erected to accommodate R. varioacantha n. sp. ex Carcharhinus sorrah (Müller & Henle) and R. mexicoensis n. sp. ex Sphyrna lewini (Griffith & Smith). Unlike R. mexicoensis n. sp., R. varioacantha n. sp. has a pars bothrialis not overlapping the pars bulbosa and the number of testes is higher. Reimeriella mexicoensis n. sp. possesses very large uncinate to falcate hooks in the basal armature, while in R. varioacantha n. sp. these hooks are almost the same in size as the remaining hooks in both the basal and metabasal armature. The latter species is the first tentaculariid species where the metabasal armature very closely resembles an eutetrarhynchid with a heteroacanthous typical homeomorphous metabasal armature and a high number of spiniform hooks per half spiral row (10–11 vs 6–7 in R. mexicoensis n. sp.) in the metabasal and apical armature. This pattern provides further morphological evidence for the close relationship of the Eutetrarhynchoidea and the Tentacularioidea. Reimeriella varioacantha n. sp. enriches the trypanorhynch fauna from off the coast of Malaysian Borneo while R. mexicoensis n. sp. is a novel record of a tentaculariid trypanorhynch from the Mexican Pacific.

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Acknowledgements

FGM thanks to the Instituto Politecnico Nacional, Mexico, for the Fellowships (COFAA, EDI). We also thank Professor Janine N. Caira and Professor Kirsten Jensen for collecting the specimens of Carcharhinus sorrah off Malaysia as well as isolating the material described in this paper.

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Authors and Affiliations

  1. Aquaculture and Sea-Ranching, Faculty of Agricultural and Environmental Sciences, University of Rostock, Justus-von-Liebig-Weg 6, 18059, Rostock, Germany

    Harry W. Palm

  2. Fishery Quality Control Centre, Ministry of Fisheries Wealth, P.O. Box 427, 100 Al Bustan, Masqat, Oman

    José Raúl Morales-Ávila

  3. Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas (CICIMAR), Ave. IPN s/n, Col. Playa Palo de Santa Rita, A.P. 592, C.P. 23096, La Paz, Baja California Sur, Mexico

    José Raúl Morales-Ávila & Felipe Galván-Magaña

  4. Department of Biology, Faculty of Sciences, University of Guilan, Rasht, Iran

    Mohammad Haseli

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  1. Harry W. Palm
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Correspondence to Mohammad Haseli.

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All applicable institutional, national and international guidelines for the care and use of animals were followed. Biological sampling in Mexico was carried out with funds supported by Project conacyt No. 253700 (Biología básica de las especies de tiburones y rayas de importancia comercial en la costa occidental de Baja California Sur), under permission: SADER, PPF/DGOPA-006/19.

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Palm, H.W., Morales-Ávila, J.R., Galván-Magaña, F. et al. A new genus and two new species of trypanorhynch cestodes (Tentaculariidae) from the sharks Carcharhinus sorrah (Müller & Henle) and Sphyrna lewini (Griffith & Smith) from off the coasts of Malaysia and Mexico . Syst Parasitol 97, 133–142 (2020). https://doi.org/10.1007/s11230-020-09904-w

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