Opercularia minima Kahl, 1935

Chаtterjee, Tаpаs, Dovgаl, Igor, Pešić, Vlаdimir & Zаwаl, Аndrzej, 2018, A checklist of epibiont suctorian and peritrich ciliates (Ciliophora) on halacarid and hydrachnid mites (Acari: Halacaridae & Hydrachnidia), Zootaxa 4457 (3), pp. 415-430 : 423-424

Opercularia minima Kahl, 1935

Records on hydrachnid mites: Kahl (1935) described the species, which found on legs of freshwater aquatic mites (without host identification) from Germany.

New finds: In the present paper we report the following new records of Opercularia minima :

Locality: Valley of Krąpiel river near Dalewo, Poland (53°23'01.1"N, 15°10'18.3"E); biotope: oxbow, 0.5 m depth, Glyceria sp.undergrowth; host species: Arrenurus bicuspidator Berlese, 1885 ; localization: legs; Intensity: 1 ciliate per host individual. Date of collection 15.10.2010, collector: А. Zawal.

Locality: Valley of Krąpiel river near Dalewo, Poland (53°23'01.1"N, 15°10'18.3"E); biotope: oxbow, 0.5 m depth, Glyceria sp.undergrowth; host species: Arrenurus cuspidator (Müller, 1776) ; localization: legs; Intensity: 5 ciliates per host individual. Date of collection 15.10.2010, collector: А. Zawal.

Locality : valley of Krąpiel river near Dalewo, Poland (53°23'01.1"N, 15°10'18.3"E); biotope: oxbow, 0.5 m depth, Glyceria sp.; host species: Arrenulus maculator (Müller, 1776); localization: legs; intensity: 20 ciliates per host individual. Date of collection 15.10.2010, collector: А. Zawal.

Locality : Valleyof Krąpiel river above Pęzino, Poland (53°27'52.4"N, 15°14'45.8"E); biotope: helocrene, mud and leaves on the bottom; host species: Arrenurus conicus Piersig, 1894 ; localization: legs; intensity: 10 ciliates per host individual. Date of collection 0 3.09.2011, collector: А. Zawal.

Locality : Valley of Krąpiel river above Pęzino, Poland (53°27'52.4"N, 15°14'45.8"E); biotope: helocrene, mud and leaves on the bottom; host species: Lebertia glabra Thor, 1897 ; localization: legs; Intensity: 20 ciliates per host individual. Date of collection 0 3.09.2011, collector: А. Zawal.

Locality : River Krąpiel near Pęzino, Poland (53°20'03.5"N, 15°11'11.2"E); biotope: fast flow of water, stones; host species: Hygrobates calliger Piersig, 1896 ; localization: legs; intensity: 20 ciliates per host individual. Date of collection 15.10.2010, collector: А. Zawal.

Locality : River Krąpiel near Sułkowo, Poland (53°19'53.3"N, 15°07'59.7"E); biotope: marginal pool, 0.2 m depth, sand and mud; host species: Lebertia porosa Thor, 1900 ; localization: legs; Intensity: 10 ciliates per host individual. Date of collection 13. 0 7. 2011, collector: А. Zawal.

Locality : River Krąpiel near Dalewo, Poland (53°20'03.5"N, 15°11'11.2"E); biotope: marginal pool, 0.2 m depth, sand; host species: Lebertia oblonga Koenike, 1911 ; localization: legs; intensity: 10 ciliates per host individual. Date of collection 12.09.2010, collector: А. Zawal.

Locality : River Krąpiel beneath Pęzino, Poland (53°20'09.7"N, 15°09'37.8"E); biotope: fast flow of water, 0.5 m depth, gravel; host species: Lebertia oblonga Koenike, 1911 ; localization: legs; intensity: 3 ciliates per host individual. Date of collection 0 5.11.2011, collector: А. Zawal.

Locality : River Szum, near Górecko Kościelne, Poland (50°30'06.7"N, 22°58'05.2"E); biotope: marginal pool, 0.2 m depth, sand; host species: Wettina podagrica (Koch, 1837) ; localization: legs; intensity: 5 ciliates per host individual. Date of collection 31.10.1974, collector: А. Zawal.

Locality : River Szum, near Górecko Kościelne, Poland (50°30'06.7"N, 22°58'05.2"E); biotope: marginal pool, 0.2 m depth, sand; host species: Wettina podagrica (Koch, 1837) ; localization: legs; intensity: 5 ciliates per host individual. Date of collection 31.10.1974, collector: А. Zawal.

Locality : Sękacz Lake, Poland (53°56'56.7"N, 17°09'56.9"E); biotope: 1 m depth, sand; host species: Arrenurus albator (Müller, 1776) ; localization: legs; intensity: 1 ciliate per host individual. Date of collection: 0 1.08.2014, collector: А. Zawal.

Locality : Graniczne Lake, Poland (52°05'26.0"N, 14°55'53.2"E); biotope: 1 m depth, stones; host species: Arrenurus albator (Müller, 1776) ; localization: legs; intensity: 1-3 ciliates per host individual. Date of collection 0 5.08.2014, collector: А. Zawal.

Locality: Somiko Lake, Poland (54°04'45.0"N, 17°52'47.2"E); biotope: 1 m depth, Phragmites sp. under growth; Host species: Hydrodroma pilosa Besseling, 1940 ; localization: legs; intensity: 2ciliates per host individual. Date of collection 31.07.2014, collector: А. Zawal.

Locality : Somiko Lake, Poland (54°04'45.0"N, 17°52'47.2"E); biotope: 3 m depth, mud; host species: Forelialiliacea (Müller, 1776); localization: legs; intensity: 6 ciliates per host individual. Date of collection 31.07.2014, collector: А. Zawal.

Remarks: This species was registered in activated sludge of a treatment facilities plant in Lublin and Świdnik ( Poland) ( Jaromin-Gleń et al. 2013; Babko et al. 2014).

This species was also reported by Safi et al. (2014) at artificial substrates (glass slides) deployed in Guaiba Lake in Brasilia, Brazil.