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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 PLoS+One
2015 ; 10
(10
): e0139463
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When Ontogeny Matters: A New Japanese Species of Brittle Star Illustrates the
Importance of Considering both Adult and Juvenile Characters in Taxonomic
Practice
#MMPMID26509273
Martynov A
; Ishida Y
; Irimura S
; Tajiri R
; O'Hara T
; Fujita T
PLoS One
2015[]; 10
(10
): e0139463
PMID26509273
show ga
Current taxonomy offers numerous approaches and methods for species delimitation
and description. However, most of them are based on the adult characters and
rarely suggest a dynamic representation of developmental transformations of
taxonomically important features. Here we show how the underestimation of
ontogenetic changes may result in long term lack of recognition of a new species
of one of the most common ophiacanthid brittle stars (Echinodermata: Ophiuroidea)
from the North Pacific. Based on vast material collected predominantly by various
Japanese expeditions in the course of more than 50 years, and thorough study of
appropriate type material, we revise the complex of three common species of the
ophiuroid genus Ophiacantha which have been persistently confused with each
other. The present study thus reveals the previously unrecognized new species
Ophiacantha kokusai sp.nov. which is commonly distributed off the Pacific coast
of Japan. The new species shows developmental differentiation from the closely
related species Ophiacantha rhachophora H. L. Clark, 1911 and retains clearly
expressed early juvenile features in the adult morphology. Another species,
Ophiacantha clypeata Kyte, 1977, which had been separated from O. rhachophora, is
in turn shown to be just a juvenile stage of another North Pacific species,
Ophiacantha trachybactra H.L. Clark, 1911. For every species, detailed
morphological data from both adult and juvenile specimens based on scanning
electron microscopy are presented. A special grinding method showing complex
internal features has been utilized for the first time. For all three species in
this complex, a clear bathymetric differentiation is revealed: O. rhachophora
predominantly inhabits shallow waters, 0-250 m, the new species O. kokusai lives
deeper, at 250-600 m, and the third species, O. trachybactra, is found at
500-2,000 m. The present case clearly highlights the importance of considering
developmental transformations, not only for a limited number of model organisms,
but as part of the taxonomic process.