Feather mites (Acariformes, Astigmata) from marine birds of the Barton Peninsula (King George Island, Antarctica), with descriptions of two new species Author Han, Yeong-Deok https://orcid.org/0000-0002-6625-8966 Department of Biological Sciences, Inha University, Incheon 22212, Republic of Korea & Restoration Assessment Team, Research Center for Endangered Species, National Institute of Ecology, Gowol-gil 23, Yeongyang-gun, 36531, Republic of Korea Author Mironov, Sergey V. Zoological Institute, Russian Academy of Sciences, Universitetskaya embankment 1, Saint-Petersburg, 199034, Russia Author Kim, Jeong-Hoon Korea Polar Research Institute, Yeonsu-gu, Incheon 21990, Republic of Korea jhkim94@kopri.re.kr Author Min, Gi-Sik Department of Biological Sciences, Inha University, Incheon 22212, Republic of Korea mingisik@inha.ac.kr text ZooKeys 2021 2021-10-04 1061 109 130 http://dx.doi.org/10.3897/zookeys.1061.71212 journal article http://dx.doi.org/10.3897/zookeys.1061.71212 1313-2970-1061-109 5239C96059FE4C04B8BF1D8FC33B4C75 621AC222512E581FAEE2DE9894D5E5D4 Alloptes (Alloptes) aschizurus Gaud, 1952 Alloptes aschizurus Gaud, 1952: 163-164, fig. 2; Atyeo and Peterson 1967 : 98; 1970 : 129. Alloptes (Alloptes) aschizurus : Gaud 1972 : 59. Material examined. 3 males and 3 females (NIBR No. NIBRIV0000887146-NIBRIV0000887151) from Chionis albus (Gmelin) ( Charadriiformes , Chionidae ), Antarctica , King George Island , Barton Peninsula , 62°14'16"S , 58°46'13"W , 8 January 2016 , coll. Han Y.-D. Remarks. Alloptes (Alloptes) aschizurus was initially described from specimens collected from the Black-faced Sheathbill, Chionis minor (Hartlaub) on Kerguelen Island ( Gaud 1952 ). Later, this mite species was found on the same host on Heard Island and on the Snowy Sheathbill, Ch. albus , on Greenwich Island and Gaston Islands ( Atyeo and Peterson 1967 ). As for all members of the subgenus Alloptes Alloptes s. str., this mite species is characterized by the following features: in both sexes, genual setae mG II are spiculiform; in males, the opisthosoma is shaped as an equilateral triangle with a strongly enlarged posterior end; in females, the posterior end of the opisthosoma is rounded, and the opisthosomal lobes are not developed ( Gaud 1972 ; Vasyukova and Mironov 1991 ; Mironov and Hernandes 2020 ). Alloptes (A.) aschizurus is distinguished from the closest species of the subgenus, A. (A.) tringae (Grube, 1859) [widely known under the junior synonym A. (A.) crassipes (Canestrini, 1878)] in having the following features. In both sexes, the length of the idiosoma is approximately 500 long (vs approximately 450 in A. tringae ), and trochanteral setae sR III are equal to or slightly longer than the trochanters III (vs distinctly shorter than the trochanters) ( Gaud 1952 ; Atyeo and Peterson 1967 ; Vasyukova and Mironov 1991 ; Mironov and Hernandes 2020 ). Molecular data. The COI sequences were obtained from two individuals and deposited in GenBank with accession numbers MZ489637 and MZ489638.