Attachment structures in Rhizotrochus (Scleractinia): macro- to microscopic traits and their evolutionary significance
Attachment structures in Rhizotrochus (Scleractinia): macro- to microscopic traits and their evolutionary significance
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根轮属（Scleractinia）的附着结构：宏观到微观特征及其进化意义
DOI：
10.1111/let.12013
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发表时间：
2013
期刊：
影响因子：
1.5
通讯作者：
Tokuda Yuki and Ezaki Yoichi
中科院分区：
文献类型：
--
作者：
Mibe K;Kawamoto T;Tokuda Yuki and Ezaki Yoichi
生活在坚硬基质上的海洋无底栖生物进化出了多种附着策略。根曲珊瑚是偶氮黄藻类单生硬核珊瑚的代表，地理分布广泛，附着结构独特；它通过从珊瑚壁延伸出来的许多管状小根牢牢地附着在坚硬的基质上，而大多数无根珊瑚是通过珊瑚基部的体体增强结构附着在坚硬的基质上。细根本身的详细形态和结构特征，以及它们的进化意义，还没有完全解决。根茎中毛羽和小根的生长发育过程是同源的，它们都是从壁的生长边缘发育而来，是由壁结构的转变形成的，它们的骨骼微结构具有相似的特征，如快速增生和增厚沉积的模式。从分子系统发育和化石记录来看，软腹动物的根状根是由一个共同的自由生活祖先进化而来的，它们利用了适应软基质环境的刺状根侵入硬基质栖息地。
Marine sessile benthic organisms living on hard substrates have evolved a variety of attachment strategies.Rhizotrochus(Scleractinia, Flabellidae) is a representative azooxanthellate solitary scleractinian coral with a wide geographical distribution and unique attachment structures; it firmly attaches to hard substrates using numerous tube-like rootlets, which are extended from a corallum wall, whereas most sessile corals are attached by stereome-reinforced structures at their corallite bases. Detailed morphological and constructional traits of the rootlets themselves, along with their evolutionary significance, have not yet been fully resolved. Growth and developmental processes of spines inTruncatoflabellumand rootlets inRhizotrochussuggest that these structures are homologous, as they both develop from the growth edges of walls and are formed by transformation of wall structures and their skeletal microstructures possess similar characteristics, such as patterns of rapid accretion and thickening deposits. Taking molecular phylogeny and fossil records of flabellids into consideration,Rhizotrochusevolved from a common free-living ancestor and invaded hard-substrate habitats by exploiting rootlets of spines origin, which were adaptive for soft-substrate environments.