Morphological observation of Epithemia ocellata (Ehr.) Kütz. (Bacillariophyceae) from China

The species of Epithemia ocellata (Ehr.) Kütz. from Northeastern China were observed by scanning electron microscopy (SEM). The studies on silica valve formation in different stages were made. At the early stage, a Y-shaped raphe sternum was found. Areolae were made from virgae and vimines. In immature valves, the canal formation before the raphe fissure is visible. The raphe system, virgae and vimines (areolae) might be the early siliceous elements of the valve during morphogenesis. The formations of virgae and vimines are similar to that of Gephyria media W. Arnott. Rows of silica papillae formed gradually on the face of the valve. After the areolae were covered with silica and form rows of papillae, the outer valve surface could become mature. Details of the internal costae were observed in mature valves.     

新发现的红拟石首鱼溃疡病病原海藻施万氏菌的分离和分子鉴定

首次从患溃疡病的养殖红抉石首鱼（Scinenops ocellata)病灶和肠、肝、肾等处分离到多株细菌，发现其中两析经注射和创伤感染后，能引起体表溃疡，肠道积水等症状，与自然发病表现类似。经过生理生化鉴定为弧菌科（Vibrionacea)篱万氏菌属（Shewanella)，进一步用16S rDNA扩增测序鉴定该菌为海藻施万氏菌（Shewanella algae)，其主要特征为：革兰氏阴性，TCBS生长，产硫化氢，嗜盐，不利用葡萄糖产酸或产气，也不发酵其他糖类产酸；蛋白酶，硝酸盐还原酶，氧化酶阳性；具有较强的溶血活性。利用作者研制出的PCR检测试剂盒，对海藻施万氏菌进行了快速的分子鉴定。     

Morphological observation of Epithemia ocellata （Ehr.） Kuetz. （Bacillariophyceae） from China

The species of Epithemia ocellata （Ehr.） Kuetz. from Northeastern China were observed by scanning electron microscopy （SEM）. The studies on silica valve formation in different stages were made. At the early stage, a Y-shaped raphe sternum was found. Areolae were made from virgae and vimines. In immature valves, the canal formation before the raphe fissure is visible. The raphe system, virgae and vimines （areolae） might be the early siliceous elements of the valve during morphogenesis. The formations of virgae and vimines are similar to that of Gephyria media W. Arnott. Rows of silica papillae formed gradually on the face of the valve. After the areolae were covered with silica and form rows of papillae, the outer valve surface could become mature. Details of the internal costae were observed in mature valves.     

中国大陆沿海鲆科新记录属——线鳍鲆属(Taeniopsetta)和新纪录种——眼斑线鳍鲆(Taeniopsetta ocellata)*

2016年10月采自北部湾海域的1尾鱼类标本经鉴定为线鳍鲆属Taeniopsetta Gilbert, 1905的眼斑线鳍鲆Taeniopsetta ocellata(Günther, 1880), 隶属于鲽形目Pleuronectiformes鲆科Bothidae, 这是该属和种首次在中国大陆海域的报道。线鳍鲆属的主要形态特征包括: 体长卵圆形; 双眼位于头左侧; 口小; 有眼侧和无眼侧均有1行小尖牙; 鳞细小, 仅体左侧有1条侧线; 雄鱼有1枚强吻棘和2或3枚眼棘, 雌鱼吻棘和眼棘很钝或无; 无眼侧腹鳍始于有眼侧第2根腹鳍鳍条基部右侧; 腹鳍基较短; 背鳍和臀鳍的部分鳍条延长成丝状。眼斑线鳍鲆的主要形态特征为: 两侧胸鳍不等长; 雄鱼背鳍的第13~17根鳍条及臀鳍的第1~6根鳍条延长成丝状; 体左侧背腹缘分别有2~4个不规则的“V”形或半圆形中空黑色斑块, 斑块内部具一黄色圆斑。