Vietnamella chebalingensis, a new species of the family Vietnamellidae (Ephemeroptera) from China based on morphological and molecular data Author Luo, Yanping 0000-0001-5077-3245 Department of Entomology, College of Plant Protection, South China Agricultural University, Guangzhou 510642, Guangdong, China Chebaling National Nature Reserve, Shixing, Guangdong, China & ypluo @ stu. scau. edu. cn; https: // orcid. org / 0000 - 0001 - 5077 - 3245 ypluo@stu.scau.edu.cn Author Jiang, Jian 0000-0002-1246-4457 Department of Entomology, College of Plant Protection, South China Agricultural University, Guangzhou 510642, Guangdong, China Chebaling National Nature Reserve, Shixing, Guangdong, China & 2387225193 @ qq. com; https: // orcid. org / 0000 - 0002 - 1246 - 4457 2387225193@qq.com Author Wang, Lili 0000-0002-8104-9564 Department of Entomology, College of Plant Protection, South China Agricultural University, Guangzhou 510642, Guangdong, China Chebaling National Nature Reserve, Shixing, Guangdong, China & 492918181 @ qq. com; https: // orcid. org / 0000 - 0002 - 8104 - 9564 492918181@qq.com Author Shu, Zufei 0000-0001-7069-5408 410541683 @ qq. com; https: // orcid. org / 0000 - 0001 - 7069 - 5408 410541683@qq.com Author Tong, Xiaoli Department of Entomology, College of Plant Protection, South China Agricultural University, Guangzhou 510642, Guangdong, China Chebaling National Nature Reserve, Shixing, Guangdong, China text Zootaxa 2020 2020-10-27 4868 2 208 220 journal article 8888 10.11646/zootaxa.4868.2.2 23166e4c-7f7d-4832-8bdd-c589af7fe546 1175-5326 4417564 CF101A75-C662-4ACA-8C7C-127840D33DD8 Key to known larvae of Vietnamella (Excluding V. ornata which is known only from the subimago) 1. Outer pair of cephalic projections with serration............................................................. 2 - Outer pair of cephalic projections smooth without serration.................................................... 3 2 Length ratio from basal to apical segments of maxillary palp = 1:0.9:0.7; pairs of projections on posterior margins of abdominal tergites I–X....................................................................... Vietnamella sp. A [ India ] - Length ratio from basal to apical segments of maxillary palp = 1.3:1:1.1; pairs of projections on posterior margins of abdominal tergites II–VI and VIII–X, tergite VII with a single projection............................ Vietnamella sp. B [ Thailand ] 3 Body, especially legs usually with mottled color pattern....................................................... 4 - Body and legs usually unicolor.......................................................................... 6 4 Length ratio of outer cephalic projection to the inner about 2:1; length ratio from basal to apical segments of maxillary palp =1:1.3:1; pairs of projections on posterior margins of abdominal tergites I–VI and VIII–X, tergite VII with only a single posterior projection.................................................................... V. chebalingensis sp. nov. - Length ratio of outer cephalic projection to the inner at least 3:1; pairs of projections on posterior margins of abdominal tergites I–X................................................................................................ 5 5 Length ratio from basal to apical segments of maxillary palp =1:1.3:1; transverse ridge of fore femur with spatulate setae............................................................................................... V. nanensis - Length ratio from basal to apical segments of maxillary palp =1.3:1.2:1; transverse ridge of fore femur with small rounded setae...................................................................................... V. maculosa 6 Length of basal segment of maxillary palp nearly equal to length of the second segment, posterior margin of tergite X with a pair of weakly developed projections................................................................ V. thani - Length of basal segment of maxillary palp shorter than length of the second segment, posterior margin of tergite X with a pair of apparent pointed projections.................................................................. V. sinensis