Moscow State Pedagogical University, Kibalchicha str., 6, korp. 3, Moscow, 129278, Russia. .
2Severtsov Institute of Ecology & Evolution, Russian Academy of Sciences, Leninski pr. 33, Moscow 119071, Russia. .
Zootaxa. 2022 Sep 20;5188(4):383-395. doi: 10.11646/zootaxa.5188.4.6.
Two new species with forehead processes are described from the east of the European part and Western Siberia. Megalothorax processus sp. nov. has a long cuticular process extended at the tip. The cuticular process in M. roseus sp. nov. is formed by a group of four papillae. Two other species, M. potapovi Schneider, Porco & Deharveng, 2016 and M. sanctistephani Christian, 1998, with a "nose" in the frontal part of the head are known from the Far East of Russia and West Europe, respectively. The «noses» probably arise independently in the four species; their function is unclear. Apart from the form of the forehead processes M. processus sp. nov. differs from M. roseus sp. nov. by the shape of sensilla within sensory fields (flame-shaped vs. globular) and the absence of chaeta а0 (vs. present in M. roseus sp. nov.). Chaetotaxy of the frontal part of the head and abdomen is reduced in both species.
描述了来自欧洲东部和西西伯利亚东部的两种具有额突的新种。长额突巨胸切叶蚁 Megalothorax processus sp. nov. 具有延伸至尖端的长角质突起。在 M. roseus sp. nov. 中，角质突起由一组四个乳突形成。另外两个种，M. potapovi Schneider、Porco & Deharveng, 2016 和 M. sanctistephani Christian, 1998，在俄罗斯远东和西欧分别具有头部前部长“鼻子”。这些“鼻子”可能在四个物种中独立出现；其功能尚不清楚。除了额突的形式外，新种 M. processus sp. nov. 在感觉域内感觉器的形状（火焰状与球形）和无 а0 刚毛（与 M. roseus sp. nov. 中的存在不同）方面与 M. roseus sp. nov. 不同。两个物种的头部和腹部的额突的触角数量都减少了。
