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Four Myxobolus spp. (Myxosporea: Bivalvulida) from the gill lamellae of common carp (Cyprinus carpio) and Japanese silver crucian carp (Carassius langsdorfii) in the western part of Japan, with the description of three new species (M. tanakai n. sp., M. paratoyamai n. sp., and M. ginbuna n. sp.)
Approximately three dozen Myxobolus spp. (Myxozoa: Myxosporea: Bivalvulida) have been described to parasitize the gills of carp of the genera Cyprinus and Carassius . Hitherto, these fish were often introduced to temperate waters worldwide as food and ornamental fish from Asia, their place of origin...
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Published in: | Parasitology research (1987) 2017-09, Vol.116 (9), p.2427-2441 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Approximately three dozen
Myxobolus
spp. (Myxozoa: Myxosporea: Bivalvulida) have been described to parasitize the gills of carp of the genera
Cyprinus
and
Carassius
. Hitherto, these fish were often introduced to temperate waters worldwide as food and ornamental fish from Asia, their place of origin. The present study examined the myxosporean infection of seven common carp (
Cyprinus carpio
) and seven Japanese silver crucian carp (
Carassius langsdorfii
) collected from the Fushinogawa River around the university in Yamaguchi City, Japan, during the period April 2015 to October 2016. In total, four
Myxobolus
spp. were detected in the gill lamellae of
Cy. carpio
and
Ca
.
langsdorfii
, i.e., two species in each species of fish. The four species were characterized morphologically and genetically based on the 18S ribosomal RNA gene (rDNA). A new species,
Myxobolus tanakai
n. sp., from four individuals of
Cy. carpio
had an elongated pyriform spore (15.4–18.6 μm by 6.3–8.4 μm), resembling the spore shape of
Myxobolus koi
from
Cy. carpio
or
Carassius auratus
in Japan, China, and the USA, but bigger than it (13.2–15.6 μm by 6.6–7.8 μm). The new species formed a clade with
M. koi
but was distinct from any of the isolates of this species (nucleotide identities less than 98.6%). The second new species,
Myxobolus paratoyamai
n. sp., from a single
Cy. carpio
with its one prominent and one rudimentary polar capsule closely resembled the spore morphology of
Myxobolus toyamai
from
Cy. carpio
or
Carassius gibelio
in Japan, China, and the USA. However, the isolate formed a clade with
Myxobolus longisporus
from
Cy. rubrofuscus
in China rather than with
M. toyamai
isolates (nucleotide identities less than 97.9% with known species). Another new species,
Myxobolus ginbuna
n. sp., from two individuals of
Ca
.
langsdorfii
had similar-shaped spores to
Myxobolus wulii
, but the dimensions were smaller (11.7–13.9 μm by 8.5–9.8 μm vs. 17.6–18.5 μm by 8.9–10.0 μm). This new species formed a clade with
M. wulii
but was distinct from any of the
M. wulii
isolates from
Ca
.
gibelio
in China (nucleotide identities less than 99.1%). An additional species,
Myxobolus pyramidis
, from six individuals of
Ca
.
langsdorfii
was morphologically and genetically similar to the previous record from
Ca
.
gibelio
in China (99.6% nucleotide identity of the 18S rDNA). Two of these six individuals were mix-infected with
M. ginbuna
n. sp. This is a new host and geographical distribution record for
M. pyram |
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ISSN: | 0932-0113 1432-1955 |
DOI: | 10.1007/s00436-017-5545-4 |