Ding Manqing, Jacobus Luke M, Zhou Changfa
The Key Laboratory of Jiangsu Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China.
Division of Science, Indiana University Purdue University Columbus, 4601 Central Avenue, Columbus, IN 47203, USA.
Insects. 2022 Nov 4;13(11):1019. doi: 10.3390/insects13111019.
Species in the genus Serratella Edmunds, 1959 from China have never been compared and photographed systematically. Six valid Chinese Serratella species are recognized and revised in this paper. Among them, the imagos of S. brevicauda Jacobus et al., 2009 are unknown; the nymph of this species has a stout, strong body, with remarkably short caudal filaments and maxillary palpi. In contrast, only the imago stage of Serratella fusongensis (Su and You, 1988) (=Serratella longipennis Zhou et al., 1997, syn. nov.) is known; it has relatively long penes with small dorsal projections. The nymphs of S. setigera Bajkova, 1967 have small abdominal tergal spines but distinct, stout, blunt bristles on the spines, and the apexes of the male penes are round and shallowly divided. The fourth species, S. acutiformis sp. nov., which was collected from Western China, has sharp penial apexes (imagos) and large abdominal spines (nymphs). Unlike the former four species, S. ignita (Poda, 1761) and S. zapekinae Bajkova, 1967 has sub-quadrate penes without prominent dorsal projections. The nymph of S. ignita has lateral hair-like setae on the caudal filaments, while the nymph of S. zapekinae lacks such setae but has pairs of tubercles on the head and pronotum. Some characters used in the generic delineation of the genera Ephemerella Walsh, 1862 and Serratella, such as nymphal maxillary palpi and hair-like setae on caudal filaments as well as features of the imaginal penes and forelegs, are varied in Chinese species. However, all species in this paper have bifurcate ventral lamellae of gill VI. Our work highlights a need for further comparative systematic study of the genera Serratella, Ephemerella, and another related genus Torleya Lestage, 1917.
1959年埃德蒙兹（Edmunds）所定的锯形蜉属（Serratella）物种从未在中国进行过系统的比较和拍照。本文识别并修订了中国境内6个有效的锯形蜉属物种。其中，短尾锯形蜉（Serratella brevicauda）雅各布斯（Jacobus）等人，2009年的成虫未知；该物种的若虫身体粗壮、结实，尾丝和下颚须明显短。相比之下，抚松锯形蜉（Serratella fusongensis）（苏和尤，1988年）（=长翅锯形蜉（Serratella longipennis）周等人，1997年，新同物异名）仅成虫期已知；其阳茎相对较长，背侧有小的突起。1967年巴伊科娃（Bajkova）所定的刺锯形蜉（Serratella setigera）若虫腹部背板有小刺，但刺上有明显、粗壮、钝圆的刚毛，雄性阳茎顶端圆形且浅裂。第四个物种，新种尖形锯形蜉（S. acutiformis sp. nov.），采自中国西部，其阳茎顶端尖锐（成虫），腹部刺大（若虫）。与前四个物种不同，火锯形蜉（Serratella ignita）（波达（Poda），1761年）和扎佩基纳锯形蜉（S. zapekinae）巴伊科娃，1967年的阳茎近方形，无明显的背侧突起。火锯形蜉若虫的尾丝有侧生的毛状刚毛，而扎佩基纳锯形蜉若虫没有这种刚毛，但头部和前胸有一对瘤。用于划分埃蜉属（Ephemerella）沃尔什（Walsh），1862年和锯形蜉属的一些特征，如若虫的下颚须和尾丝上的毛状刚毛以及成虫阳茎和前腿的特征，在中国的物种中有所不同。然而，本文中的所有物种鳃VI的腹侧薄片都分叉。我们的工作强调需要对锯形蜉属、埃蜉属和另一个相关属托利蜉属（Torleya）莱斯塔热（Lestage），1917年进行进一步的比较系统研究。
