Two new species of Seira Lubbock, 1870 (Collembola: Entomobryidae: Seirinae) from Brazilian Caatinga Author Nunes, Rudy Camilo Laboratory of Collembola, Department of Botany and Zoology, Biosciences Center, Federal University of Rio Grande do Norte (UFRN), Highway BR- 101, Lagoa Nova, Campus Universitario, 59072 - 970, Natal, RN, Brazil. & Biodiversity and Biotechnology Research Group of North Center Piaui, Federal Institute of Education, Science and Technology of Piaui, Pedro II, Piaui, Brazil. Author Cipola, Nikolas Gioia 0000-0002-7594-9574 Laboratory of Soil Invertebrate Systematics and Ecology, National Institute of Amazonian Research-INPA, CPEN, Manaus, Brazil nikolasgc @ gmail. com; https: // orcid. org / 0000 - 0002 - 7594 - 9574 nikolasgc@gmail.com Author Bellini, Bruno Cavalcante 0000-0001-7881-9436 Laboratory of Collembola, Department of Botany and Zoology, Biosciences Center, Federal University of Rio Grande do Norte (UFRN), Highway BR- 101, Lagoa Nova, Campus Universitario, 59072 - 970, Natal, RN, Brazil. & entobellini @ gmail. com; https: // orcid. org / 0000 - 0001 - 7881 - 9436 entobellini@gmail.com text Zootaxa 2021 2021-10-05 5048 1 1 30 journal article 10.11646/zootaxa.5048.1.1 1175-5326 5549080 D8D39DE7-B270-4D1D-8CB3-25286966F751 Genus Seira Lubbock, 1870 Diagnosis. Antennae shorter than body. Coarsely ribbed and ciliated scales, oval or elongated and apically rounded (rarely truncate, pointed or irregular) present on dorsal body, ventral head and appendages. Apically strongly ciliated macrochaetae, apically foot-shaped or acuminate, present on dorsal body. Dorsal chaetotaxy moderately plurimacrochaetotic. Eyes 8+8. Four prelabral chaetae ciliated, rarely smooth; labral formula as 4 ( a1–2 ), 5 ( m0–2 ), 5 ( p0–2 ) smooth chaetae. Four labral papillae (inner and outer) present. Th. II normal, not projected anteriorly. Th. II–Abd. V with ms and sens formulae as 1,0|1,0,1,0,0 and 1,1|0,2,2,+,3, respectively; Abd. II–IV bothriotricha formula as: 2 ( a5 , m2 ), 3 ( a5 , m2 , m5 ), 3 ( T2 , T4 , D3 ) (except in S. rowani Yosii, 1959 , with 2 bothriotricha on Abd. IV); bothriotricha with spear-shaped accessory chaetae. Males of few species with sexual dimorphism consisting in the presence of a stout spiny mac on femur I and tibiotarsus I (Palearctic species). Ungues lateral teeth normal, rarely enlarged. Pretarsus with a small smooth chaeta in anterior and posterior faces. Manubrial plate and dorsal dens devoid of modified blunt macrochaetae. Falcate mucro, without the basal spine (adapted from Cipola et al. 2018 ; Godeiro et al. 2020 ).