Morphology and molecular phylogeny of epizoic araphid diatoms on marine zooplankton, including Pseudofalcula hyalina gen. & comb. nov (Fragilariophyceae, Bacillariophyta)
Morphology and molecular phylogeny of epizoic araphid diatoms on marine zooplankton, including Pseudofalcula hyalina gen. & comb. nov (Fragilariophyceae, Bacillariophyta)
复制标题
海洋浮游动物（包括伪镰刀藻属）上生代蜘蛛纲硅藻的形态学和分子系统发育。
DOI：
10.1111/jpy.12760
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发表时间：
2018
影响因子：
2.9
通讯作者：
Lin Senjie
中科院分区：
文献类型：
--
作者：
Gómez Fern;o;Wang Lu;Lin Senjie
一些硅藻能够作为附着生物在它们潜在的浮游动物捕食者身上定居。本文报道了寄生在桡足类革蜱上的太平洋拟扁甲虫（Pseudohimantidiumpacificum）、寄生在短角水蚤上的大西洋原蚜（Protoraphisatlanticum）、寄生在藤壶的鲤形幼体上的胡氏原蚜（Protoraphishustedtiana）和寄生在桡足类纺锤水蚤（Acartililljeborcus）上的透明镰孢虫（Falculahyalina）的新发现。在培养条件下，表生硅藻可以自由生长，太平洋拟半甲藻（Pseudohimantidium pacificum）和大西洋拟半甲藻（P. atlantica）是从底栖硅藻祖先衍生最多的物种。这些物种的菌株的粘液垫或柄表现出重要的形态学差异时，与他们的epizoic形式相比。藤壶幼体在定居前会探索底栖环境，附着生物作用是藤壶利用宿主行为进行底栖种群扩散的一个例子。基于SSU rRNA和RuBisCO大亚基（rbcL）基因序列的分子生物学研究显示，透明镰孢是脆壁目（Tabularia，Catacombas等）内的一个独立谱系，与其在眼缘中的低行数（≤6）的形态学差异以及其他特征一致。我们建议将F. hyalinatogenusPseudofalculagen。nov.分子生物发生学表明，圆藻目和原蚜目的成员是一个单一的目的，而在海洋浮游动物上的蚜虫硅藻的epibioses已经独立获得了几次。这些分支是由epizoic和epiphytic/epilithic形式，证据最近收购的epizoic方式vivendi。
Some diatoms are able to colonize as epibionts on their potential zooplankton predators. Here, we reportPseudohimantidium pacificumliving on the copepodCorycaeus giesbrechtiand as a new finding onOithona nana,Protoraphis atlanticaliving on the copepodPontellopsis brevis,Protoraphis hustedtianaon the cypris larvae of barnacles, andFalcula hyalinaon the copepodAcartia lilljeborgii. The epizoic diatoms were able to grow as free‐living forms under culture conditions.Pseudohimantidium pacificumandP. atlanticaappeared as the most derived species from their benthic diatom ancestors. The mucilage pad or stalk of the strains of these species showed important morphological distinction when compared with their epizoic forms. Barnacle larvae explore benthic habitats before settlement, and epibiosis on them is an example whereP. hustedtianaprofits from the host behavior for dispersal of its benthic populations. Molecular phylogenies based on the SSU rRNA and RuBisCO large subunit (rbcL) gene sequences revealedF. hyalinaas an independent lineage within the Fragilariales (Tabularia,Catacombas,and others), consistent with its morphological distinction in the low number of rows (≤6) in the ocellulimbus, among other features. We propose the transfer ofF. hyalinato the genusPseudofalculagen. nov. Molecular phylogeny suggests a single order for the members of the Cyclophorales and the Protoraphidales, and that the epibioses of araphid diatoms on marine zooplankton have been independently acquired several times. These clades are constituted of both epizoic and epiphytic/epilithic forms that evidence a recent acquisition of the epizoic modus vivendi.