Four new species of Mesomyzostoma (Myzostomida: Annelida)
Rouse, G.W.; Lanterbecq, D.; Summers, M.M.; Eeckhaut, I. (2016). Four new species of Mesomyzostoma (Myzostomida: Annelida). J. Nat. Hist. 50(1-2): 1-23. https://dx.doi.org/10.1080/00222933.2015.1056266
In: Journal of Natural History. Taylor & Francis: London. ISSN 0022-2933; e-ISSN 1464-5262, more
Mesomyzostoma Remscheid, 1918 currently includes three described species that live in the coelom and/or gonads of comatulid crinoids: Mesomyzostoma reichenspergeri Remscheid, 1918, Mesomyzostomakatoi Okada, 1933 and Mesomyzostomalanterbecqae Summers and Rouse, 2014 in Summers, Al-Hakim et al. 2014. Here we describe four new species of Mesomyzostoma and assess their phylogenetic relationships using 18S rRNA, cytochrome oxidase subunit I and 16S rRNA sequence data. We also designate a neotype for M. katoi as the original types appear to be lost. We record M. reichenspergeri from the Australian Great Barrier Reef and from northern Papua New Guinea, but samples from the type locality (Aru Islands, Indonesia) and previously recorded host are needed for confirmation. The new species of Mesomyzostoma are one Japanese species: Mesomyzostomaokadai sp. nov., and three Australian species: Mesomyzostomalobus sp. nov., Mesomyzostomaleukos sp. nov. and Mesomyzostomabotulus sp. nov. The first infects the coelom of crinoid arms and pinnules, and the other three are found in crinoid oral discs. We also record M. leukos sp. nov. and M. botulus sp. nov. from Papua New Guinea. Phylogenetic analyses suggest that M. okadai sp. nov. is the sister group to all other Mesomyzostoma.
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