Planothidium sheathii, a new monoraphid diatom species from rivers in California, USA

被引:11
|
作者
Stancheva, Rosalina [1 ]
机构
[1] Calif State Univ San Marcos, Dept Biol Sci, San Marcos, TX 92096 USA
关键词
Planothidium; Bacillariophyta; rivers; California; new species; electron microscopy; SP-NOV BACILLARIOPHYTA; SP; NOV; STREAMS; ZYGNEMATOPHYCEAE; ACHNANTHIDIACEAE; LANCEOLATUM; CHAROPHYTA; TAXONOMY;
D O I
10.11646/phytotaxa.393.2.4
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Planothidium sheathii sp. nov., a new species from rivers in California, USA, is described based on light and scanning electron microscopy. P. sheathii has broadly lanceolate to elliptic valves with obtusely rounded apices and a unique combination of morphological features, as follows: 1) cavum with broad hood aperture that flares out at the valve margin with open borders fused with the neighboring virgae on SV, 2) multiseriate striae, composed of five to six rows of same sized areolae on both valves, interrupted at valve mantle junction, and 3) areolae groups on valve mantle, with rounded areolae on RV, and rounded and elongated areolae on SV. Valve morphology of P sheathii is discussed in comparison with similar freshwater taxa, from which the new species is clearly distinct.
引用
收藏
页码:131 / 140
页数:10
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