Taxonomic revision of Saundersella (Ectocarpales s.l., Phaeophyceae) with description of Saundersella crassa sp. nov. and transfer of Heterosaundersella hattoriana to Saundersella
Taxonomic revision of Saundersella (Ectocarpales s.l., Phaeophyceae) with description of Saundersella crassa sp. nov. and transfer of Heterosaundersella hattoriana to Saundersella
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Saundersella (Ectocarpales s.l., Phaeophyceae) 的分类学修订以及 Saundersella crassa sp 的描述。
DOI：
10.1080/00318884.2021.1916859
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发表时间：
2021
期刊：
影响因子：
1.6
通讯作者：
Hanyuda Takeaki
中科院分区：
文献类型：
--
作者：
Kawai Hiroshi;Watanabe Yuki;Hanyuda Takeaki
粗厚Saundersella crassa sp. nov.（Ectocarpaless.l.，Phaeophyceae）是产于日本和北方太平洋冷水区的新记录种。单形属（属型），已鉴定为S.在该地区，该菌的菌体较长、较粗，但生长在不同的基生植物上（S. Chordariaspp vsS. simpleexonAnalcusspp），并且在拟南芥3和叶绿体的pB、psaA、psbA和rbcL DNA序列中是遗传上不同的。S.粗柄简单，丝状，柔软，凝胶状，幼时实心，以后中空，呈条索状，基部变细，柄不明显，有时扭曲，淡黄色至橄榄棕色，长50（-90）cm，宽5 mm。直立的菌体由多轴向的无色中心髓丝和2 - 6个细胞的色素同化丝组成。同化丝顶端细胞大而肿胀，呈球形或倒卵形。单室带状囊体无柄，倒卵形或不规则形，形成于髓细胞末端或同化丝基部的直立叶状体上。在分子系统学上，Heterosaundersella，H.哈托里安娜是S的妹妹crassaand嵌套在由S.单纯形和S. crassa，不管他们的差异，在习惯和发生的基础匍匐叶状体形成多室zoidangia。因此，我们提出了新的组合S。hattoriana comb. nov.哈托里安娜。Heterosaundersellathus成为Saundersella的分类异名。
Saundersella crassa sp. nov. (Ectocarpaless.l., Phaeophyceae) is newly described from cold-water regions of Japan and the northern Pacific.Saundersella crassais similar toS. simplex(generitype) in morphology and has been identified asS. simplexin the area, but it has longer and thicker thalli, grows on different basiphytes (S. crassaonChordariaspp vsS. simplexonAnalipusspp) and is genetically distinct in the mitochondrialcox3 and chloroplastatpB,psaA,psbA andrbcL DNA sequences. The erect thalli ofS. crassawere simple, filiform, soft and gelatinous, solid when young but later becoming hollow, cord-shaped, attenuated at the base to an indistinct stipe, at times twisted, yellowish to olive brown, and up to 50(–90) cm long and 5 mm wide. The erect thalli were composed of multiaxial colourless central medullary filaments and pigmented assimilatory filaments of 2–6 cells. Terminal cells of the assimilatory filaments were large and swollen, spherical or obovate. Unilocular zoidangia were sessile and obovate or irregular in shape, and were formed on erect thalli at the end of medullary cells or at the base of assimilatory filaments. In the molecular phylogeny, the type of the genusHeterosaundersella, H. hattoriana, was sister toS. crassaand was nested in the clade composed ofS. simplexandS. crassa, irrespective of their differences in the habit and occurrence of basal prostrate thalli forming plurilocular zoidangia. Therefore, we propose the new combinationS. hattoriana comb. nov. forH. hattoriana. Heterosaundersellathus becomes a taxonomic synonym ofSaundersella.