Four new species of Guimaraesiella (Phthiraptera: Ischnocera: Brueelia-complex) from China Author Gustafsson, Daniel R. 0000-0001-8868-8310 Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Library of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Sciences, 105 Xingang West Road, Haizhu District, Guangzhou, 510260, Guangdong Province, China. & https: // orcid. org / 0000 - 0001 - 8868 - 8310 Author Tian, Chunpo 0000-0001-8681-4475 Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Library of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Sciences, 105 Xingang West Road, Haizhu District, Guangzhou, 510260, Guangdong Province, China. & https: // orcid. org / 0000 - 0001 - 8681 - 4475 Author Ren, Mengjiao 0000-0002-0108-6104 Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Library of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Sciences, 105 Xingang West Road, Haizhu District, Guangzhou, 510260, Guangdong Province, China. & College of Biology and Environmental Science, Jishou University, 120 Renmin Road, Jishou, 416000, Hunan Province, China. & https: // orcid. org / 0000 - 0002 - 0108 - 6104 Author Liu, Zhixiao 0000-0002-1151-1864 College of Biology and Environmental Science, Jishou University, 120 Renmin Road, Jishou, 416000, Hunan Province, China. & https: // orcid. org / 0000 - 0002 - 1151 - 1864 Author Yu, Xiaoping 0000-0002-6744-5595 College of Life Sciences, Shaanxi Normal University, 620 West Chang’an Street, Chang’an District, Xi’an City, 710119, Shaanxi Province, China. & https: // orcid. org / 0000 - 0002 - 6744 - 5595 Author Zou, Fasheng 0000-0002-8913-5651 Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Library of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Sciences, 105 Xingang West Road, Haizhu District, Guangzhou, 510260, Guangdong Province, China. & https: // orcid. org / 0000 - 0002 - 8913 - 5651 text Zootaxa 2021 2021-11-01 5060 3 333 352 journal article 3750 10.11646/zootaxa.5060.3.2 c8c02a66-7a09-4629-ae97-dc01e565f4cf 1175-5326 5635813 A9780904-16FA-4006-A8DE-E301D40294F0 Guimaraesiella ( Cicchinella ) citreisoma new species ( Figs 13–20 ) Type host: Leiothrix lutea kwangtungensis Whistler, 1943 – red-billed leiothrix ( Leiothrichidae ). Type locality: Gaijingliang Village , Daping Township , Malipo County , Wenshan Prefecture , Yunnan Province , China . Diagnosis. Guimaraesiella citreisoma keys out to Guimaraesiella hampuslybecki Gustafsson et al ., 2019a , in the key of Gustafsson et al . (2019a) . These two species can be separated by the following characters: dorsal preantennal suture reaches lateral margin of head in G. ( C. ) citreisoma ( Fig. 15 ), but not in G. ( C. ) hampuslybecki ; female abdominal segments IV–V each with 2 ps on each side in G. ( C. ) citreisoma ( Fig. 14 ), but with 3 ps on each side of G. ( C. ) hampuslybecki ; proximal mesosome smaller and more rectangular in G. ( C. ) citreisoma ( Fig. 19 ) than in G. ( C. ) hampuslybecki ; mesosomal lobes with distally convergent posterior margins and small lateral concavity in G. ( C. ) citreisoma ( Fig. 19 ), but with more or less flat posterior margins and proportionately larger lateral concavity in G. ( C. ) hampuslybecki ; gonopore and structure around gonopore different between the two species ( Fig. 19 ); female subgenital plate proportionately longer and slender, and clear reticulation more extensive in G. ( C. ) citreisoma ( Fig. 20 ) than in G. ( C. ) hampuslybecki . Description. Both sexes. Head trapezoidal ( Fig. 15 ), lateral margins of preantennal area slightly convex, frons deeply concave. Dorsal preantennal suture reaches dsms, ads and lateral margin of head, where is extends posteriorly along margin of head (this is difficult to see in many specimens, depending on mounting). Marginal carina broad, with irregular median margin; preantennal nodi large, bulging. Head chaetotaxy as in Fig. 15 . Antennae slightly sexually dimorphic ( Figs 15–16 ). Pre-ocular nodi much larger than post-ocular nodi. Marginal temporal carina relatively narrow, of rather equal width throughout. Gular plate distally pointed. Thoracic, abdominal segments and chaetotaxy as in Figs 13–14 . Measurements as in Table 1 . Male. Genitalia with basal apodeme broad, with concave lateral margins ( Fig. 17 ). Proximal mesosome roughly rectangular, with slightly concave lateral margins. Ventral sclerite slender, finger-like, shaped as in Fig. 19 , almost reaching anterior margin of mesosome. Mesosomal lobes with distally convergent lateral margins; marginal thickening continuous with more anterior nodi; lateral concavity small with proximal pmes situated in concavity and posterior pmes situated posterior to concavity. Gonopore roughly triangular; ames not associated with gonopore. Parameral heads of irregular shape ( Fig. 18 ), parameral blades rather stout, slightly elongated; pst1–2 as in Fig. 17 . Female. Subgenital plate rather long and slender, with extensive reticulation covering most of central plate ( Fig. 20 ); connection to cross-piece broad. Vulval margin gently rounded, with 2–3 short, slender vms and 5–8 short, thorn-like vss on each side; 4 short, slender vos on each side of subgenital plate; distal 1 vos on each side median to vss . Etymology. The species epithet is formed by citreus , Latin for “lemon”, and soma , Greek for “body”, referring to the pale yellow colour of this species. Type material. Ex Leiothrix lutea kwangtungensis : Holotype ♂ , Gaijingliang Village , Daping Township , Malipo County , Wenshan Prefecture , Yunnan Province , China , 20 Jun. 2016 , Yuchun Wu & Xingzhi Chu , bird ID J3177, GD-PHTH-00413 ( IZGAS ). Paratypes : 1♂ , 6♀ , same data as holotype, GD-PHTH-00414–00420 ( IZ- GAS ) . Non-types: 1♂ , 4♀ , Tongle Provincial Nature Reserve , Guangdong Province , China , 25 Jul. 2015 , Yanyan Zhao & Wenming Xu , bird ID J2742, GD-PHTH-00421–00423 ( IZGAS ) . Remarks. The genitalia of the only male examined from Guangdong Province are partially obscured by gut content, so it cannot be conclusively established that they are the same as those of the holotype . No other visible characters contradict the assumption that the specimens from these two provinces are conspecific, and we tentatively treat them as such until more samples are collected and studied.