Table 1 in Three new Achnanthidium (Bacillariophyceae) species from Lake Salda (Anatolia, Turkey), a deep soda lake

Table 1. Comparison of morphological characteristics of Achnanthidium barlasii sp. nov., A. dumlupinarii sp. nov., and morphologically similar taxa. Achnanthidium barlasii sp. nov.Achnanthidium dumlupinarii sp. nov.Achnanthidium minutissimumAchnanthidium polonicumAchnanthidium ertziiAchnanthidium sieminskiaeAchnanthidium tropicocatenatumValve length (μm)12.0-21.515.0-26.08.8-17.411.4-21.518-2211-1810.3-23.9Valve width (μm)2.0-3.02.5-3.52.2-4.12.6-4.02.2-2.62-32.7-3.5Valve outlinelinear with parallel margins and lanceolatelinear-lanceolate to linear-rhombic, and clearly inflated in central portionlinear-elliptic to linear-lanceolatenarrow clearly lanceolate with convex marginslinear-lanceolate with convex marginslinear-lanceolatelinear-lanceolate, slightly inflated in the central portionValve apicesprotractedsubcapitate to capitaterostrate to subcapitate protracted or as a rectangular fasciasubcapitateclearly capitateprotracted and capitateprotracted, subcapitate to capitateStriation patternstrongly radiate, throughout the valve and denser near the apicesstrongly radiate throughout the valve, denser towards the apicesstrongly radiate and denser near the apicesradiate throughout the valve and more strongly radiate near the apices-radiate throughout, strongly radiate near apicesradiate throughout the valve, denser towards the apicesRaphe valveCentral areaslightly rhombic with 1-2 spaced striae composed of 3, rounded rectangular areolaesmall bordered by 1-3 widely spaced stria both sidesalmost absent, slightly rounded or as a rectangular fascia (more rarely)rectangular fascia, in some valves with one shortened striae near the valve marginsrounded, never forming a fascia due to presence of several shortened spaced central striaeirregular, 1-2 shortened striaesmall rounded, bordered by one more widely spaced stria on one or both sidesStriae (in 10 μm)27-3027-2830 (up to 35 near the apices)33-34 (up to 35-38 near the apices)28-3030-3236-40 (up to 45 near the apices)Number of areolae (per striae)3 (1-2 at the apices)4 at the central area, 3-4 at the apices3-4 (rarely 2)3-52-33-43-6Rapheless valveCentral areaabsentabsent or slightly rhombicweakly elliptical and almost absentsmall, never forming a fascia with striae slightly more spaced than the striae located towards the apicesalmost non-existing, discernable due to several more widely spaced striaeirregular, 1-2 shortened striaeindistinct or narrow lanceolateStriae (in 10 μm)27-3028-2935 (up to 40 near apices)28-30 (35-38 up to near the apices)28-3430-3238-40Number of areolae (per striae)4 (2-3 at the apices)4-5 at the central area, 3-4 at the apices3-53-52-33-53-6ReferenceThis studyThis studyNovais (2015)Wojtal et al. (2011)Van de Vijver et al. (2011)Witkowski et al. (2012)Marquart et al. (2017)表1 巴氏曲壳藻（Achnanthidium barlasii）新种、杜姆卢皮纳里曲壳藻（Achnanthidium dumlupinarii）新种与形态近似类群的形态特征比较 | 特征 | 巴氏曲壳藻（Achnanthidium barlasii）新种 | 杜姆卢皮纳里曲壳藻（Achnanthidium dumlupinarii）新种 | 极小曲壳藻（Achnanthidium minutissimum） | 波兰曲壳藻（Achnanthidium polonicum） | 埃尔茨曲壳藻（Achnanthidium ertzii） | 谢明斯卡曲壳藻（Achnanthidium sieminskiae） | 热带链状曲壳藻（Achnanthidium tropicocatenatum） | | --- | --- | --- | --- | --- | --- | --- | --- | | 壳面长度（μm） | 12.0-21.5 | 15.0-26.0 | 8.8-17.4 | 11.4-21.5 | 18-22 | 11-18 | 10.3-23.9 | | 壳面宽度（μm） | 2.0-3.0 | 2.5-3.5 | 2.2-4.1 | 2.6-4.0 | 2.2-2.6 | 2-3 | 2.7-3.5 | | 壳面轮廓 | 边缘平行的线形，呈披针形 | 线状披针形至线状菱形，中部明显膨大 | 线状椭圆形至线状披针形 | 狭披针形，边缘微凸 | 线状披针形，边缘微凸 | 线状披针形 | 线状披针形，中部略膨大 | | 壳面顶端 | 延长 | 亚头状至头状喙状 | 喙状至亚头状，延长或具矩形带 | 亚头状 | 明显头状 | 延长且头状 | 延长，亚头状至头状 | | 纹式 | 全壳纹强烈放射状，顶端纹更密集 | 全壳纹强烈放射状，向顶端渐密 | 纹强烈放射状，顶端纹更密集 | 全壳放射状，顶端纹更强烈 | - | 全壳放射状，顶端纹强烈放射 | 全壳纹放射状，向顶端渐密 | | 壳缝壳面中央区 | 略呈菱形，具1-2条间距宽的纹，每条纹由3个圆角矩形的点纹组成 | 小型，两侧具1-3条间距宽的纹 | 几不可见，略呈圆形或矩形带（极少数情况） | 矩形带，部分壳面边缘具1条缩短的纹 | 圆形，因具多条间距宽的中央缩短纹，从不形成带 | 不规则，具1-2条缩短的纹 | 小型圆形，单侧或双侧具1条间距更宽的纹 | | 每10μm内的纹数 | 27-30 | 27-28 | 30（顶端可达35） | 33-34（顶端可达35-38） | 28-30 | 30-32 | 36-40（顶端可达45） | | 每条纹的点纹数 | 3（顶端为1-2） | 中央区为4，顶端为3-4 | 3-4（极少数为2） | 3-5 | 2-3 | 3-4 | 3-6 | | 无壳缝壳面 | | | | | | | | | 中央区 | 无 | 无或略呈菱形 | 弱椭圆形，几不可见 | 小型，从不形成带，中央纹较顶端纹间距更宽 | 几不可见，因具多条间距更宽的纹可辨识 | 不规则，具1-2条缩短的纹 | 不明显或狭披针形 | | 每10μm内的纹数 | 27-30 | 28-29 | 35（顶端可达40） | 28-30（顶端可达35-38） | 28-34 | 30-32 | 38-40 | | 每条纹的点纹数 | 4（顶端为2-3） | 中央区为4-5，顶端为3-4 | 3-5（极少数为2） | 3-5 | 2-3 | 3-5 | 3-6 | | 参考文献 | 本研究 | 本研究 | Novais (2015) | Wojtal et al. (2011) | Van de Vijver et al. (2011) | Witkowski et al. (2012) | Marquart et al. (2017) |