Unrecorded species of Korean invertebrates discovered through the project of ‘ Discovery of Korean Indigenous Species’ II Author Ji, Su-Jung Department of Biological Sciences and Bioengineering, Inha University, Incheon 22212, Republic of Korea Author Jung, Chuleui Department of Plant Medicals, Andong National University, Andong 36729, Republic of Korea Author Bang, Hyun Woo Division of Biomedical Engineering & Biotechnology, College of Science & Technology, Mokwon University, Author Song, Min Ok Department of Biology, Gangneung-Wonju National University, Gangneung 25457, Republic of Korea Author Jung, Jongwoo Department of Science Education, Ewha Womans University, Seoul 03760, Republic of Korea Author Yoon, Seong Myeong Department of Biology, Chosun University, Gwangju 61452, Republic of Korea Author Lee, Seunghwan Insect Biosystematics Laboratory, Department of Agricultural Biotechnology, College of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea Author Keum, Seoyoung Department of Plant Medicals, Andong National University, Andong 36729, Republic of Korea & Silkworm and Insect Management Center, Agricultural Resource Management Institute, Gyeongbuk Provincial Government, Sangju 37110, Republic of Korea Author Yang, Hee-Min Department of Biological Sciences and Bioengineering, Inha University, Incheon 22212, Republic of Korea Author Lee, Dongmin Department of Parasitology, Parasite Research Center and International Parasite Resource Bank, School of Medicine, Chungbuk National University, Cheongju 28644, Republic of Korea Author Lee, Geon Hyeok Department of Biological Sciences and Bioengineering, Inha University, Incheon 22212, Republic of Korea & Department of Biology, Chosun University, Gwangju 61452, Republic of Korea Author Oh, Jaeseok Insect Biosystematics Laboratory, Department of Agricultural Biotechnology, College of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea Author Kim, Kichoon Department of Life Science, College of Natural Sciences, Hanyang University, Seoul 04763, Republic of Korea Author Park, Hansol Department of Parasitology, Parasite Research Center and International Parasite Resource Bank, School of Medicine, Chungbuk National University, Cheongju 28644, Republic of Korea Author Moon, Heejin Division of Biomedical Engineering & Biotechnology, College of Science & Technology, Mokwon University, Author Joharchi, Omid Department of Plant Medicals, Andong National University, Andong 36729, Republic of Korea Author Kang, Yeseul Department of Parasitology, Parasite Research Center and International Parasite Resource Bank, School of Medicine, Chungbuk National University, Cheongju 28644, Republic of Korea Author Eom, Keeseon S. Department of Parasitology, Parasite Research Center and International Parasite Resource Bank, School of Medicine, Chungbuk National University, Cheongju 28644, Republic of Korea Author Lee, Kyung Jin Animal Resources Division, National Institute of Biological Resources, Incheon 22689, Republic of Korea Author Eun, Ye Animal Resources Division, National Institute of Biological Resources, Incheon 22689, Republic of Korea Author Kim, Taeho Animal Resources Division, National Institute of Biological Resources, Incheon 22689, Republic of Korea Author Karanovic, Ivana Department of Life Science, College of Natural Sciences, Hanyang University, Seoul 04763, Republic of Korea ivana@hanyang.ac.kr Author Lee, Jeounghee The Division of EcoCreative, Ewha Womans University, Seoul 03760, Republic of Korea & Marine Biological Resource Institute, Sahmyook University, Seoul 01795, Republic of Korea ivana@hanyang.ac.kr Author Choe, Seongjun Department of Parasitology, Parasite Research Center and International Parasite Resource Bank, School of Medicine, Chungbuk National University, Cheongju 28644, Republic of Korea ivana@hanyang.ac.kr Author Min, Gi-Sik Department of Biological Sciences and Bioengineering, Inha University, Incheon 22212, Republic of Korea ivana@hanyang.ac.kr text Journal of Species Research 2023 2023-02-28 12 1 68 89 journal article 10.12651/JSR.2023.12.1.068 2713-8615 12753339 21. Gaeolaelaps debilis (Ma, 1996) ( Fig. 21 ) ƞġșṻṄ응j ( ṵAE ) Hypoaspis debilis Ma, 1996 . Hypoaspis debilis Ma, 2004 . Gaeolaelaps debilis Beaulieu, 2009 , Yan et al. , 2018: 261. Material examined. Taehwa River ( 35°53′83″N , 129°31′ 13″E ), Ulsan-si , Korea ; Soil; collected by SY Keum on 3 June 2015 . Deposition. NIBRIV0000835092. World distribution. China , Iran , Russia far east and Korea . Diagnosis. Body size much larger (539 - 575 long, 288 - 315 wide) and leg I shorter than idiosoma, anal shield longer than wide, post-stigmatic section well developed after stigma. Presternal area sclerotized, with lineate reticulation and bearing st1. Sternal shield with almost smooth, with two pairs of simple and subequal sternal setae, st1 off the shield, genito-ventral shield narrower and longer, its posterior end reaches to the level of JV2, anal shield longer than wide and the peritreme extended to the middle of coxa I. Remarks. This species is associated with nests of squirrel or ants, and phoretic but not parasitic. This can be free-living predators of smaller arthropods (Kafi et al. , 2020). Gaeolaelaps debilis has the unusual character state of setae st1 off sternal shield. Sternal shield in Gaeolaelaps usually bears three pairs of setae, rarely setae st1 off shield in the presternal region. This only occurs in eight species of Gaeolaelaps (Beaulieu, 2009; Kazemi et al. , 2014; Joharchi et al. , 2019a - c). However, seta st1 being off the sternal shield in the presternal region can be difficult to discern. In particular, in some of the aforementioned species, seta st1 could be borne on paired anterior extensions of the shield, as in G. jondishapouri . Family Pachylaelapidae Berlese, 1913 ĩ÷응jň Genus Onchodellus Masan and Halliday, 2014 ǖĩ÷응jṧ Material examined. Uiseong-gun ( 36°27′29″N , 128°23′ 36″E ), Korea ; collected by SY Keum on 23 April 2012 . Deposition. N. A. World distribution. Japan and Korea . Diagnosis. Dorsum. Dorsal shield entire, weakly reticulated, 30 pairs of simple setae. Setae i4 as long as the distance between bases of setae j4 and z2. Tritosternum well developed. Sternal shield fused with four pair of simple setae and five pair of pores. Genito-ventral shield wider than long. Peritreme extending anteriorly beyond coxae I and base of seta r1. Epistome median denticulate bifurcate process. Corniculi short. Tarsus II with a short stout spur. Remarks. The species is bigger (length: 0.65 mm ) than Pachylaelaps ishizuchiensis and was regrouped from the genus Pachylaelaps to the genus Onchodellus by Masan and Halliday (2014).