Berger H (1999) Monograph of the Oxytrichidae (Ciliophora, Hypotrichia). Monogr Biol 78: 1-1080 
Berger H (2006) Monograph of the Urostyloidea (Ciliophora, Hypotricha). Monogr Biol 85: 1-1304 
Berger H (2008) Monograph of the Amphisiellidae and Trachelostylidae (Ciliophora, Hypotricha). Monogr Biol 88: 1-737 
Berger H (2011) Monograph of the Gonostomatidae and Kahliellidae (Ciliophora, Hypotricha). Monogr Biol 90: 1-741 
Blatterer H, Foissner W (1988) Beitrag zur terricolen Ciliatenfauna (Protozoa: Ciliophora) Australiens. Stapfia 17: 1-84 
Chen LY, Dong JY, Wu WN, Xin YY, Warren A, Ning YZ, Zhao Y (2020) Morphology and molecular phylogeny of a new hypotrich ciliate, Anteholosticha songi nov. spec., and an American population of Holosticha pullaster (Müller, 1773) Foissner et al., 1991 (Ciliophora, Hypotrichia). Eur J Protistol 72: 125646
Dong JY, Li LF, Fan XP, Ma HG, Warren A (2020) Two Urosoma species (Ciliophora, Hypotrichia): a multidisciplinary approach provides new insights into their ultrastructure and systematics. Eur J Protistol 72: 125661 doi: 10.1016/j.ejop.2019.125661
Foissner W (1987) Miscellanea nomenclatorica ciliatea (Protozoa: Ciliophora). Arch Protistenkd 133: 219-235 doi: 10.1016/S0003-9365(87)80054-4
Foissner W (2016) Terrestrial and semiterrestrial ciliates (Protozoa, Ciliophora) from Venezuela and Galápagos. Denisia 35: 1-912 
Foissner W, Agatha S, Berger H (2002) Soil ciliates (Protozoa, Ciliophora) from Namibia (Southwest Africa), with emphasis on two contrasting environments, the Etosha region and the Namib Desert. Part Ⅰ. Text and line drawings. Denisia 5: 1-1459 
Heber D, Stoeck T, Foissner W (2014) Morphology and ontogenesis of Psilotrichides hawaiiensis nov. gen. , nov. spec. and molecular phylogeny of the Psilotrichidae (Ciliophora, Hypotrichia). J Eukaryot Microbiol 61: 260-277 doi: 10.1111/jeu.12104
Hu XZ, Lin XF, Song WB (2019) Ciliates atlas: species found in the South China Sea. Science Press, Beijing
Jung JH, Berger H (2019) Monographic treatment of Paraholosticha muscicola (Ciliophora, Keronopsidae), including morphological and molecular biological characterization of a brackish water population from Korea. Eur J Protistol 68: 48-67 doi: 10.1016/j.ejop.2018.12.004
Kaur H, Negi SRK, Kamra K (2019) Morphological and molecular characterization of Neogastrostyla aqua nov. gen. , nov. spec. (Ciliophora, Hypotrichia) from River Yamuna, Delhi; comparison with Gastrostyla-like genera. Eur J Protistol 68: 68-79 doi: 10.1016/j.ejop.2019.01.002
Kim KS, Min GS (2015) New record of two soil ciliates (Ciliophora: Stichotrichia) from Korea. Korean J Environ Biol 33: 383-389 doi: 10.11626/KJEB.2015.33.4.383
Kim KS, Min GS (2019) Morphology and molecular phylogeny of Oxytricha seokmoensis sp. nov. (Hypotrichia: Oxytrichidae), with notes on its morphogenesis. Eur J Protistol 71: 125641 doi: 10.1016/j.ejop.2019.125641
Kumar S, Foissner W (2015) Biogeographic specializations of two large hypotrich ciliates: Australocirrus shii and A. australis and proposed synonymy of Australocirrus and Cyrtohymenides. Eur J Protistol 51: 210-228 doi: 10.1016/j.ejop.2015.02.002
Luo XT, Yan Y, Shao C, Al-Farraj SA, Bourland WA, Song WB (2018) Morphological, ontogenetic and molecular data support strongylidiids as being closely related to Dorsomarginalia (Protozoa, Ciliophora) and reactivation of the family Strongylidiidae Fauré-Fremiet, 1961. Zool J Linn Soc 184: 237-254 doi: 10.1093/zoolinnean/zly001
Luo XT, Huang JA, Li LF, Song WB, Bourland WA (2019) Phylogeny of the ciliate family Psilotrichidae (Protista, Ciliophora), a curious and poorly-known taxon, with notes on two algae-bearing psilotrichids from Guam, USA. BMC Evol Biol 19: 125 doi: 10.1186/s12862-019-1450-z
Lyu Z, Wang JY, Huang J, Warren A, Shao C (2018) Multigene-based phylogeny of Urostylida (Ciliophora, Hypotrichia), with establishment of a novel family. Zool Scr 47: 243-254 doi: 10.1111/zsc.12267
Paiva T da S (2020) Systematic redefinition of the Hypotricha (Alveolata, Ciliophora) based on combined analyses of morphological and molecular characters. Protist 171: 125755 doi: 10.1016/j.protis.2020.125755
Pan XM, Bourland W, Song WB (2013) Protargol synthesis: an in-house protocol. J Eukaryot Microbiol 60: 609-614 doi: 10.1111/jeu.12067
Park KM, Jung JH, Jeong HK, Min GS, Kim S (2020) Morphology, morphogenesis, and molecular phylogeny of a new freshwater ciliate, Gonostomum jangbogoensis n. sp. (Ciliophora, Hypotricha), from Victoria Land, Antarctica. Eur J Protistol 73: 125669 doi: 10.1016/j.ejop.2019.125669
Shao C, Hu CX, Fan YB, Warren A, Lin XF (2019) Morphology, morphogenesis and molecular phylogeny of a freshwater ciliate, Monomicrocaryon euglenivorum euglenivorum (Ciliophora, Oxytrichidae). Eur J Protistol 68: 25-36 doi: 10.1016/j.ejop.2019.01.001
Shao C, Chen XM, Jiang JM (2020) Hypotrichous ciliates in China. Science Press, Beijing, p 429
Singh J, Kamra K (2013) Paraurosomoida indiensis gen. nov. , sp. nov. , an oxytrichid (Ciliophora, Hypotricha) from Kyongnosla Alpine Sanctuary, including note on non-oxytrichid Dorsomarginalia. Eur J Protistol 49: 600-610 doi: 10.1016/j.ejop.2013.04.001
Song WB, Shao C (2017) Ontogenetic patterns of hypotrichs ciliates. Science Press, Beijing, pp 1-497
Song WB, Wilbert N (1989) Taxonomische Untersuchungen an Aufwuchsciliaten (Protozoa, Ciliophora) im Poppelsdorfer Weiher, Bonn. Lauterbornia 3: 2-221 
Wang JY, Li JB, Shao C (2020a) Morphology, morphogenesis, and molecular phylogeny of a novel saline soil ciliate, Heterourosomoida sinica n. sp. (Ciliophora, Hypotrichia). Eur J Protistol 73: 125666 doi: 10.1016/j.ejop.2019.125666
Wang JY, Zhao Y, Lu XT, Lyu Z, Warren A, Shao C (2020b) Does the Gonostomum-patterned oral apparatus in hypotrichia carry a phylogenetic signal? Evidence from morphological and molecular data based on extended taxon sampling using three nuclear genes (Ciliophora, Spirotrichea). Sci China Life Sci. doi: 10.1007/s11427-020-1667-3
Warren A, Fyda J, Song WB (2002) The morphology of the poorly-known freshwater urostylid ciliate Neokeronopsis spectabilis (Kahl, 1932) nov. gen. nov. comb. , (Ciliophora: Urostylidae), with notes on its morphogenesis. Eur J Protistol 38: 195-206 doi: 10.1078/0932-4739-00820
Weisse T, Moser M, Scheffel U, Stadler P, Berendonk T, Weithoff G, Berger H (2013) Systematics and species-specific response to pH of Oxytricha acidotolerans sp. nov. and Urosomoida sp. (Ciliophora, Hypotricha) from acid mining lakes. Eur J Protistol 49: 255-271 doi: 10.1016/j.ejop.2012.08.001
Wilbert N (1975) Eine verbesserte Technik der Protargolimprägnation für Ciliaten. Mikrokosmos 64: 171-179 
Zhang TY, Qi HL, Zhang TT, Sheng YL, Warren A, Shao C (2019) Morphology, morphogenesis and molecular phylogeny of a new brackish water subspecies, Neourostylopsis flava paraflava nov. subsp. (Ciliophora, Hypotrichia, Urostylidae), with redefinition of the genus Neourostylopsis. Eur J Protistol 66: 48-62 
Zhang TY, Dong JY, Cheng T, Duan LL, Shao C (2020) Reconsideration of the taxonomy of the marine ciliate Neobakuella aenigmatica Moon et al., 2019 (Protozoa, Ciliophora, Hypotrichia). Mar Life Sci Technol 2: 97-108