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Two new species of dicyemid mesozoans (Dicyemida: Dicyemidae) from Octopus maya Voss & Solis-Ramirez (Octopodidae) off Yucatan, Mexico

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Abstract

Two new dicyemid species are described from the endemic cephalopod Octopus maya Voss & Solis-Ramirez collected off Yucatan, Mexico. The renal sacs of 40 juvenile and adult octopuses from four localities were examined. Dicyema hochbergi n. sp. is a medium-sized species that reaches 2,245 µm in length. The vermiform stages consist of 18–24 peripheral cells, a conical calotte and the extension of the axial cell between the base and middle of the metapolar cells. Infusoriform embryos consist of 39 cells with urn cell containing one germinal cell, two nuclei and solid refringent bodies. Dicyema mexcayae n. sp. is a relatively small species that reaches 1,114 µm in length. The vermiform stages are constituted by 14–16 peripheral cells, an elongate calotte and the axial cell extending forward to the middle of the metapolar cells. The infusoriform embryos consist of 37 cells, two solid refringent bodies and urn cells with two nuclei each. The present study represents the first description of a dicyemid species from O. maya and increases the number of described species from Mexican waters to 11.

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Acknowledgements

The authors thank Gregory Arjona, Francisco Puc, Sergio Herrera Peraza (Cooperativa Pulperos Costeños) and Isidro Puerto Esquivel for their help in collecting and processing samples. During this work SCM was funded by a postdoctoral fellowship of the National Council for Science and Technology.

Funding

This study was partly supported by the Aquatic Animal Health Committee from Campeche, L’Oréal-UNESCO for Women in Science Fellowship and grants from Grants-in-Aid for Scientific Research of the Japan Society for the Promotion of Science (research grant no. 26440216).

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  1. Sheila Castellanos-Martinez

    Present address: Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California (IIO-UABC), Carretera Ensenada-Tijuana No. 3917, Fraccionamiento Playitas, C.P. 22860, Ensenada, Baja California, Mexico

Authors and Affiliations

  1. Laboratorio de Patología Acuática, Centro de Investigación y Estudios Avanzados Unidad Mérida, Carretera Antigua a Progreso Km. 6, C.P. 97310, Mérida, Yucatán, Mexico

    Sheila Castellanos-Martinez & M. Leopoldina Aguirre-Macedo

  2. Department of Biology, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka, 560-0043, Japan

    Hidetaka Furuya

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  1. Sheila Castellanos-Martinez
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Correspondence to Sheila Castellanos-Martinez.

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Castellanos-Martinez, S., Aguirre-Macedo, M.L. & Furuya, H. Two new species of dicyemid mesozoans (Dicyemida: Dicyemidae) from Octopus maya Voss & Solis-Ramirez (Octopodidae) off Yucatan, Mexico. Syst Parasitol 93, 551–564 (2016). https://doi.org/10.1007/s11230-016-9644-x

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