New Geographical Records of Three Gill Monogeneans (Platyhelminthes) Parasitic on &lt;i&gt;Pseudorasbora parva&lt;/i&gt; (Cypriniformes: Cyprinidae) in Japan

Masato Nitta,Kazuya Nagasawa

doi:10.12782/sd.21.1.001

Abstract

Three species of monogenean, Dactylogyrus squameus Gussev, 1955, Ancyrocephalus pseudorasborae Achmerow, 1952, and Bivaginogyrus obscurus (Gussev, 1955), were collected from the gills of the cyprinid Pseudorasbora parva (Temminck and Schlegel, 1846) in Japan. Dactylogyrus squameus and A. pseudorasborae were collected in Nara, Tottori, and Ibaraki prefectures, and in Ibaraki and Okayama prefectures, respectively, and are redescribed as new country records from Japan. Bivaginogyrus obscurus has been reported from only Ibaraki and Nagano prefectures, and its discovery in Nara and Okayama prefectures as represents as new locality records. Although D. squameus and B. obscurus are known as alien parasites in Europe, all three monogeneans found in this study are considered to be native to Japan.

Highlights

Pseudorasbora parva (Temminck and Schlegel, 1846)(Cypriniformes: Cyprinidae) is natively distributed in FarEast Asia, from south-eastern Russia and regions west of the Kantō District of Honshū, Japan, in the north to northern Vietnam in the south (Hosoya 2013)
The monogenean fauna of this fish is poorly known in Japan, where only B. obscurus has been reported from Ibaraki Prefecture (Nitta and Nagasawa 2014)
Two of the three monogeneans found in this study, Dactylogyrus squameus and Ancyrocephalus pseudorasborae, were collected from Pseudorasbora parva in the native habitats of this fish in Japan

Summary

Introduction

Pseudorasbora parva (Temminck and Schlegel, 1846)(Cypriniformes: Cyprinidae) is natively distributed in FarEast Asia, from south-eastern Russia and regions west of the Kantō District of Honshū, Japan, in the north to northern Vietnam in the south (Hosoya 2013). The fish has spread into Europe as an invasive species along with two dactylogyrid monogeneans, Dactylogyrus squameus Gussev, 1955 and Bivaginogyrus obscurus (Gussev, 1955) (Ondračkova et al.2004; Galli et al 2007; Gozlan et al 2010; Anonymous 2012). The monogenean fauna of this fish is poorly known in Japan, where only B. obscurus has been reported from Ibaraki Prefecture (Nitta and Nagasawa 2014). We examined Pseudorasbora parva collected from natural habitats in. Japan and report Dactylogyrus squameus and Ancyrocephalus pseudorasborae Achmerow, 1952 as new country records and Bivaginogyrus obscurus as new prefectural records

Methods

Results

Conclusion