Mudworm Polydora lingshuiensis sp. n is a new species that inhabits both shell burrows and mudtubes.
Mudworm Polydora lingshuiensis sp. n is a new species that inhabits both shell burrows and mudtubes.
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陵水泥虫 Polydora lingshuiensis sp.
DOI：
10.11646/zootaxa.3986.1.4
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发表时间：
2015
期刊：
影响因子：
0.9
通讯作者：
Jiangyong Wang
中科院分区：
文献类型：
--
作者：
Lingtong Ye;Bin Tang;Kaichang Wu;Youlu Su;Ruixuan Wang;Ziniu Yu;Jiangyong Wang
本文记述了一新种--陵水聚伞属一新种。N.，不仅发现于珍珠贝壳洞穴(钻壳型)，也存在于珍珠牡蛎笼(筒居型)表面的泥管中，用光学显微镜、扫描电子显微镜和分子系统学方法进行了描述。陵水华山松与其他近缘种的形态和分子差异表明，陵水华山松是一个有效的新种。陵水松卵聚集在一个中空圆柱体内的繁殖特征是证实它确实是一个有效的新物种的又一证据。基于核18S rDNA、28S rDNA和线粒体16S rDNA的序列比较表明，钻壳型菌株与管居型菌株的序列同源性高达99.9%~100%。这一发现明显表明，这些物种类型是同种的。我们还发现，线粒体16S rDNA序列的比较可以提供比核18S rDNA更高的分辨率，因为前者具有更高的种间/种内差异比率。基于18S rDNA序列的系统发育分析表明，陵水松属的所有样本聚在一起，形成了一个新的姐妹支系，与远志属聚在一起，属于远志属/远志属的分支。
A new polydorin species, Polydora lingshuiensis sp. n., which is found not only in burrows of pearl oyster shells (shell-boring type) but also in mudtubes on the surface of pearl oyster cages (tube-dwelling type), is described with the use of light microscopy, scanning electron microscopy, and molecular phylogeny. Morphological and molecular distinctions between P. lingshuiensis and other related species reveal that P. lingshuiensis is a valid new species. The reproduction characteristic that the eggs of P. lingshuiensis are gathered together in one hollow cylinder is another piece of evidence confirming that it is indeed a valid new species. Sequence comparisons based on nuclear 18S rDNA, 28S rDNA, and mitochondrial 16S rDNA show that strains of the shell-boring type possess as high as 99.9% to 100% sequence identity relative to those of the tube-dwelling type. This finding evidently indicates that these species types are conspecific. We also find that a comparison of mitochondrial 16S rDNA sequences can provide a higher resolution of polydorin species than those of the nuclear 18S rDNA because the former has a higher interspecific/intraspecific difference ratio. Phylogenetic analyses based on 18S rDNA sequences indicate that all P. lingshuiensis samples group together to forming a sister clade to Polydora uncinata and thus fall within Polydora aura/P. uncinata clade.