On the taxonomy of chigger mites (Acariformes: Trombiculidae) parasitizing birds in Thailand and Malaysia, with the description of a new species Author K, Sirikamon Koosakulnirand Author RajasegaranK, Praveena Tropical Infectious Diseases Research and Education Centre, Universiti Malaya, Kuala Lumpur, & Institute for Advanced Studies, Universiti Malaya, Kuala Lumpur, Malaysia. Author Alkathiry K, Hadil A. Author ChaisiriK, Kittipong Department of Helminthology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand. Author RoundK, Philip D. Department of Biology, Faculty of Science, Mahidol University, Bangkok, Thailand. Author Eiamampai, Krairat Department of National Park Wildlife and Plant Conservation, Ministry of Natural Resources and Author Ahmad KhusainiK, Mohd K. S. Wildlife Conservation Division, Department of Wildlife and National Parks Peninsular Malaysia, Author RamjiK, Mohamad Fizl Sidq Faculty of Resources Science and Technology, University Malaysia Sarawak, Kota Samarahan, Sarawak, Author AbubakarK, Sazaly Tropical Infectious Diseases Research and Education Centre, Universiti Malaya, Kuala Lumpur, Author Ya’cobK, Zubaidah Tropical Infectious Diseases Research and Education Centre, Universiti Malaya, Kuala Lumpur, Author Stekolnikov K, Alexandr A. Laboratory of Parasitic Arthropods, Zoological Institute of the Russian Academy of Sciences, Saint Author Makepeace K, Benjamin L. Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, UK. text Acarologia 2023 2023-11-06 63 4 1109 1138 http://dx.doi.org/10.24349/yt89-g1ei journal article 10.24349/yt89-g1ei 2107-7207 10785781 Ericotrombidium cosmetopode ( Vercammen-Grandjean & Langston, 1971 ) ( Fig. 6 ) Diagnosis — SIF = 7BS-B-3-2111.0000; fPp = B/B/NNB; fCx = 1.1.1; fSt = 2.2; PL> AL > AM (PL> AM ≥ AL); fD = 2H-8-6-6-4-2 (8-6-6-4-4-2); DS = 28 – 32; V = 27 – 28; NDV = 55 – 60; Ip = 666 – 770; dorsal idiosomal setae tetrapectinate, with thin barbs; scutum with large puncta, with bilobate posterior margin; SB at level of PL; sensilla with cilia in medial part and ca. 13 branches in distal third; 1 fdistal to S 1 , f 2 distal to S 2 ; S 2 thin, pointed. Standard measurements are given in Table 8 . Distribution and hosts — This species was described from free larvae found in a ground hole, Malaysia , Selangor State , Ulu Langat Forest Reserve. Pellorneum ruficeps is the first known host of this species. Material examined — One larva ( ZIN 17937) ex Pellorneum ruficeps , MALAYSIA , Pahang State , Fraser’s Hill, 3.725630°N , 101.716365°E , 22 October 2021 , coll. P. Rajasegaran. Remarks — As compared with the original description, our specimen has longer legs and a slightly reduced number of idiosomal setae ( Table 8 ).