English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Four long-spined sea urchin species in the genus  Diadema  are known to occur around the Japanese Archipelago. Three species ( D. savignyi ,  D. setosum , and  D. paucispinum ) are widely distributed in the Indo-Pacific Ocean. The fourth species was detected by DNA analysis among samples originally collected as  D. savignyi  or  D. setosum  in Japan and the Marshall Islands and tentatively designated as  Diadema  -sp, remaining an undescribed species. We analyzed nucleotide sequences of the cytochrome oxidase I (COI) gene in the “ D. savignyi -like” samples, and found all 17 individuals collected in the mainland of Japan (Sagami Bay and Kyushu) to be  Diadema -sp, but all nine in the Ryukyu Archipelago (Okinawa and Ishigaki Islands) to be  D. savignyi , with large nucleotide sequence difference between them (11.0%±1.7 SE).  Diadema -sp and  D. savignyi  shared Y-shaped blue lines of iridophores along the interambulacrals, but individuals of  Diadema -sp typically exhibited a conspicuous white streak at the fork of the Y-shaped blue iridophore lines, while this feature was absent in  D. savignyi . Also, the central axis of the Y-shaped blue lines of iridophores was approximately twice as long as the V-component in  D. savignyi  whereas it was of similar length in  Diadema -sp. Two parallel lines were observed to constitute the central axis of the Y-shaped blue lines in both species, but these were considerably narrower in  Diadema -sp. Despite marked morphological and genetic differences, it appears that  Diadema -sp has been mis-identified as  D. savignyi  for more than half a century.

On the Fourth Diadema Species (Diadema-sp) from Japan