Hysteromorpha triloba (Rudolphi, 1819) Lutz,

Kirjušina, Muza, Bricis, Reinis & ne, Inese Gavara, 2022, Metacercariae Of Trematoda In Fish Musculature From Latvian Water Bodies, Acta Biologica Universitatis Daugavpiliensis 22 (2), pp. 189-193 : 191

Hysteromorpha triloba (Rudolphi, 1819) Lutz,

1931

For the first time parasite has been reported by Reinsone in 1955 (a, b) as syn. Neascus musculicola (Waldenburg, 1860) . Hysteromorpha triloba is a type species of genus Hysteromorpha . Encyst metacercariae H. triloba were detected in back and abdominal musculature of six fish species – bream, white bream, roach, rudd, tench and zander from lakes. Prevalence of infection varied between 12.5% and 92.5% in different hosts and lakes. However, intensity of infection was low. More often roach was infected (P=70.0%). ( Kirjusina & Vismanis 2004).

First intermediate hosts of H. triloba are molluscs Gyraulus albus ( Klochkova 1982) , which have relatively frequent occurrence in freshwater environmental in Latvia (Rudzite et al. 2010). Adult trematode is a specific intestine parasite of fish­eating birds of the genera Phalacrocorax ( Hugghins 1954, Sudarikov 2022). Great Cormorants Phalacrocorax carbo L. were found across Latvia, at both inland and coastal sites ( Lindelu 1995, Millers 2014).