A New Species of Paramacrochiron (Copepoda: Cyclopoida: Macrochironidae) Associated with the Rhizostome Medusa Rhopilema hispidum Collected from the Gulf of Thailand, with a Phylogenetic Analysis of the Family Macrochironidae

Zoological Science Volume 29 Issue 2 Page 127-133 published_at 2012
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Title ( eng )
A New Species of Paramacrochiron (Copepoda: Cyclopoida: Macrochironidae) Associated with the Rhizostome Medusa Rhopilema hispidum Collected from the Gulf of Thailand, with a Phylogenetic Analysis of the Family Macrochironidae
Creator
Boxshall Geoffrey A.
Srinui Khwanruan
Source Title
Zoological Science
Volume 29
Issue 2
Start Page 127
End Page 133
Abstract
Paramacrochiron thailandicum n. sp. (Copepoda: Cyclopoida: Macrochironidae) is described from the rhizostome medusa Rhopilema hispidum occurring in the Gulf of Thailand. The new species is distinguishable from other congeners mainly by detailed features of the fourth legs and the urosome in both sexes. Copepodid and adult stages of the genus Paramacrochiron seem to be host-specific to rhizostome medusae, but may spend periods free in the plankton or benthos during the absence of the host. A cladistic analysis shows that the Macrochironidae comprises two main lineages. Paramacrochiron is recovered as a monophyletic group, located on one lineage together with Pseudomacrochiron, which appears as a paraphyletic taxon with the limited character set used. The other main lineage comprises the genera Macrochiron and Sewellochiron, but the sole species of the latter genus, Sewellochiron fidens, is nested within Macrochiron. This analysis provides little support for maintaining Sewellochiron as a separate genus.
Keywords
copepod
rhizostome medusa
Paramacrochiron
phylogeny
Rhopilema hispidum
symbiont
NDC
Biology [ 460 ]
Language
eng
Resource Type journal article
Publisher
公益社団法人日本動物学会
Date of Issued 2012
Rights
(c) 2012 Zoological Society of Japan
Publish Type Version of Record
Access Rights open access
Source Identifier
[ISSN] 0289-0003
[DOI] 10.2108/zsj.29.127
[NCID] AA10545874
[DOI] http://dx.doi.org/10.2108/zsj.29.127