Haemogamasus ivanovi Bregetova, 1955: 271, 282, figs 511–515, 555–557.
Haemogamasus ivanovi.— Bregetova, 1956a: 143, 153, figs 298, 300–303, 336–338; Bregetova, 1956b: 1649, fig. 3, 4; Strandtmann & Wharton, 1958: 133; Allred, 1969: 109, fig. L-12; Zemskaya, 1973: 119; Bregetova, 1977: 570, figs 453 (1, 2), 454 (4, 5); Goncharova et al., 1991: 56; Fyodorova & Kharadov, 2012: 276, 277.
Type locality. Tajikistan, Gissar Ridge, Kondara gorge, Kvak locality.
Syntypes. ZIN (the holotype has been not designated).
Type hosts. The Turkestan rat, Rattus turkestanicus (Satunin, 1903) = R. pyctoris (Hodson, 1845), and the Carruthers’ vole, Microtus carruthersi Thomas, 1909.
Host range. Haemogamasus ivanovi has been collected from 10–12 species of hosts, including various species and genera of voles (Arvicolinae). Possibly, voles of the genus Microtus may be considered as main hosts of this species.
Distribution. Northern and Central Asia, Pakistan (Allred, 1969; Nikulina, 2004). An anecdotal recording of Hg. ivanovi from Switzerland (Airoldi et al., 1989) based on a single specimen has been dismissed by Mašán & Fend’a (2010) as doubtful. Its probable presence in some regions of European Russia (Nikulina, 2004) should be checked as well. In Asiatic Russia, Hg. ivanovi is known from southern Siberia (Altai Mts. eastward to Transbaikalia) as well as from Yakutia (Nikulina, 2004).
Remarks. Three species names (Haemogamasus ivanovi, Hg. nidiformis, Hg. zachvatkini) appeared for the first time in Bregetova (1955), without indication that they were new. Later, Bregetova (1956b) published these three names again as “species nova”. However, her publication of 1955 contains verbal description of characters needed to distinguish the three species from other species of Haemogamasus, which makes these names available with authorship Bregetova, 1955 (according to Article 13.1 of the International Code of Zoological Nomenclature).