Laelaps agilis Koch, 1836: 19.
Records in Baltic States: Estonia (Daiter 1961b; Daiter & Kuzhilnij 1961; Arzamasov 1968), Latvia (Lapina 1959; 1988; Grinbergs 1960; 1961a; 1961b; 1961d; 1964; 1982b; Andersone 1963; Arzamasov 1968; Salmane 2001), Lithuania (Likevičienė 1957; Podėnaitė 1960; 1979; Jezerskienė 1974; Kadytė & Jezerskienė 1986; Arnastauskienė et al. 1989; Kaminskienė et al. 2017; 2020; Kitrytė et al. 2022; current study).
Hosts: S. araneus (LV, LT), A. agrarius (EE, LV, LT), A. flavicollis (EE, LV, LT), A. sylvaticus (LV, LT), M. minutus (LV, LT), M. musculus (LV), R. norvegicus (EE, LV), R. rattus (LV), A. oeconomus (LT), A. amphibius (EE, LV), C. glareolus (EE, LV, LT), M. arvalis (EE, LV, LT).
Host specificity: highly specific parasite of A. flavicollis ( S i = 0.98).
European distribution: Austria, Belarus, Bulgaria, Czech Republic, Finland, France, Germany, Greece, Hungary, Iceland, Italy, Moldova, the Netherlands, Norway, Poland, Romania, Russia, Serbia, Slovakia, Spain, Sweden, Switzerland, Ukraine, the United Kingdom (Schweizer 1922; Bregetova et al. 1955; Bregetova 1956; Pirjanik 1962; Evans & Till 1966; Edler 1969; 1972; Shcherbak & Dudarenko 1970; Mahnert 1971a; Zapatero Ramos et al. 1978; Mehl 1979; Haitlinger 1980; 1993; 2011; 2015; Bengtson et al. 1986; Ambros 1987; Schmölzer & Neudorf 1995; Carrió et al. 1997; Chikilevskaya et al. 1998; Bernini et al. 2003; Beron 2007; Mašán & Fenďa 2010; Huhta 2015; Maaz et al. 2018; Siepel et al. 2018; Nazarizadeh et al. 2022).