Empria formosana sp. n. from Taiwan with notes on E. wui species group (Hymenoptera, Tenthredinidae)

Empria formosana Prous & Heidemaa, sp. n. is described from the mountains of Taiwan. The record is the first of this genus from Taiwan and one of the southernmost occurrences of the Empria species in the Palaearctic. The new species appears to be close to E. wui Wei & Nie, 1998 and some other species from China and Japan with incomplete vein 2A+3A in forewing (unique among Empria). Remarkably, E. formosana shows considerable intraspecific variation for this character. The mitochondrial (COI) and nuclear (ITS1 and ITS2) sequences of three undescribed species morphologically closest to E. formosana and E. wui indicate that most likely they all form a monophyletic group within Empria, defined here as E. wui species group.

台湾广背叶蜂（Empria formosana Prous & Heidemaa，新种）采自中国台湾山区。该记录为广背叶蜂属（Empria）在台湾地区的首次报道，同时也是古北界范围内分布最靠南的广背叶蜂属物种之一。本新种与吴炜广背叶蜂（E. wui Wei & Nie, 1998）以及产自中国、日本的其他部分类群亲缘关系相近，这类类群的前翅2A+3A翅脉缺失，该特征在广背叶蜂属中具有唯一性。值得注意的是，台湾广背叶蜂在该翅脉特征上存在显著的种内变异。对3个形态上与台湾广背叶蜂和吴炜广背叶蜂最为相近的未描述物种的线粒体COI基因以及核ITS1、ITS2序列进行分析后表明，这些物种极有可能共同构成广背叶蜂属内的一个单系群，本文将其界定为吴炜广背叶蜂种团（E. wui species group）。