New Record of Aspidogaster ijimai Kawamura, 1913 (Trematoda: Aspidogastridae) from Cyprinus carpio in Korea

Abstract

Aspidogastrid trematodes (Subclass Aspidogastrea) are a relatively small group with a characteristic adhesive disc and parasitize in a variety of cold-blooded hosts. Until now, only 2 species in the genus Cotylaspis, i.e., C. coreensis and C. sinensis, have been reported as the aspidogastrid trematode in the Republic of Korea (=Korea). In the present study, we intended to describe a species of aspidogastrids collected from the small intestine of the common carp, Cypri-nus carpio, in a faunistic point of view. Total 51 specimens were collected from a carp caught in Nakdong-gang (River) on May 2015. Some of them were prepared as the specimens for light microscopic observations, and some others were prepared for SEM. They were slightly elongated without head lobes, 2,432×840 μm in average size, and had characteristic adhesive discs with 4 rows and 46 alveoli in average. The ovary was reniform and was located in the posterior-upper part of the body. The single testis was larger than the ovary and was located below the ovary. The uterus was coiled containing numerous eggs and distributed in the posterior 2/3 of the body. The vitellaria were follicular, and distributed from the mid-level of testis to near the posterior end. The morphological characters with dimensions of our specimens were closely identical with those of Aspidogaster ijimai previously described. A new aspidogastrid is added among the Korean trematode fauna by the present study.

Redescription of Aspidogaster limacoides Diesing, 1834 (Aspidogastrea: Aspidogastridae) from freshwater fishes of northern Germany

“… a Present study; b Gao et al ( 2003 ); c Atopkin et al ( 2017 ); d Popiołek et al ( 2007 ); e Bychowsky and Bychowsky ( 1934 ); f Reimer ( 2002 ); g Lee et al ( 2017 ); h Sokolov et al ( 2019 ); i Bakker and Diegenbach ( 1974 ); j Halton and Lyness ( 1971 ) …”

“…In the present study, the number of alveoli in A. limacoides varied from 54 to 58 based on SEM, and 58 and 62 alveoli have been reported for this species by Atopkin et al ( 2017 ) and Popiołek et al ( 2007 ), respectively. The number of alveoli in A. ijimai was 46 based on the figure provided by Lee et al ( 2017 ) and Sokolov et al ( 2019 ), whereas in A. conchicola , 114 alveoli were counted based on the figure provided by Atopkin et al ( 2017 ) and 110 as reported by Bakker and Diegenbach ( 1974 ).…”

“…The number of alveoli in A. ijimai was 46 based on the figure provided by Lee et al ( 2017 ) and Sokolov et al ( 2019 ), whereas in A. conchicola , 114 alveoli were counted based on the figure provided by Atopkin et al ( 2017 ) and 110 as reported by Bakker and Diegenbach ( 1974 ).…”

“…On the other hand, they have a much more complex nervous system and sensory receptors compared with other groups of Platyhelminthes (Rohde 1994 ). So far, these parasitic flatworms have not been reported to cause any disease in humans nor have been found to be a significant problem for aquaculture, fisheries and other seafood industries (Lee et al 2017 ). However, Aspidogaster conchicola Baer, 1826 and A. limacoides have been reported to cause pathological problems in clams and fish ( Rutilus frisii ), respectively (Pauley and Becker 1968 ; Rahanandeh et al 2016 ).…”

“…Detailed studies on the members of the genus Aspidogaster Baer, 1826 including SEM are scarce and focused on only two species, namely, A. ijimai Kawamura, 1913 and A. conchicola Baer, 1826 (Gao et al 2003 ; Halton and Lyness 1971 ). Aspidogaster ijimai was recently studied using SEM by Lee et al ( 2017 ).…”