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1

Monogenoidea (Dactylogyridae, Gyrodactylidae) from Red River Pupfish, Cyprinodon rubrofluviatilis (Cyprinodontiformes: Cyprinodontidae), from Kansas and Texas, USA

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McAllister C. T., Cloutman D. G., Robison H. W., Neely D. A.
Acta Parasitologica
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2019
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tom 64
|
nr 3
2

Gyrodactylus triglopsi n. sp. (Monogenea: Gyrodactylidae) from the gills of Triglops nybelini Jensen, 1944 (Teleostei: Cottidae) in the Barents Sea

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Hansen H., Alvestad A. H., MacKenzie K., Darrud M., Karlsbakk E., Hemmingsen W., Arneberg P.
Acta Parasitologica
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2020
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tom 65
|
nr 3
3

Occurrence and morphogenetic characteristics of Gyrodactylus (Monogenea: Gyrodactylidae) from a rainbow trout farm (Lake Ladoga, Russia)

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Ieshko E., Barskaya Y., Parskhukov A., Lumme J., Khlunov O.
Acta Parasitologica
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2016
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tom 61
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nr 1
4

Ekopasozyty ryb z rodzaju Gyrodactylus Nordmann, 1832 [Monogenea, Gyrodactylidae]: taksonomia, biologia i ewolucja

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Zietara M. S.
Przegląd Zoologiczny
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2004
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tom 48
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nr 3-4
127-140
5
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The biology and ecology of viviparous monogeneans of the genus Gyrodactylus Nordmann, 1832 in the light of recent knowledge

100%
Matejusova I., Gelnar M.
Wiadomości Parazytologiczne
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1998
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tom 44
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nr 3
6

Description of three new European cryptic species of Gyrodactylus Nordmann, 1832 supported by nuclear and mitochondrial phylogenetic characterization

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Kuusela J., Zietara M. S., Lumme J.
Acta Parasitologica
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2008
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tom 53
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nr 2
Three previously undescribed species of wageneri group of Gyrodactylus Nordmann, 1832 (subgenus Limnonephrotus, Gyrodactylidae, Monogenoidea) related to G. lavareti Malmberg, 1957 are described here. G. pomeraniae sp. nov. was found on roach (Rutilus rutilus) in Poland and Belgium, G. ouluensis sp. nov. on roach in Finland and G. salvelini sp. nov. on Arctic charr (Salvelinus alpinus) in the Lake Inari, Finland. A molecular redescription of G. lavareti on Coregonus lavaretus is also presented, and G. bliccensis on Alburnus alburnus from river Morava, Czech Republic is included in the phylogenetic analysis. In addition, a hybrid clone of maternal G. pomeraniae sp. nov. and paternal G. lavareti found on farmed rainbow trout (Oncorhynchus mykiss) is characterized. The molecular species description was based on the complete CO1 gene of the mitochondrial DNA, and on phylogenetic comparison of the internal transcribed spacer segment (ITS1-5.8S rDNA-ITS2) of nuclear ribosomal DNA. The species hosted by cyprinids were basal in the phylogeny rooted by numerous relatives of wageneri-species group.
7

Gyrodactylus malalai sp. nov. (Monogenea, Gyrodactylidae) from Nile tilapia, Oreochromis niloticus (L.) and Redbelly tilapia, Tilapia zillii (Gervais) (Teleostei, Cichlidae) in the Lake Turkana, Kenya

80%
Prikrylova I., Radim B., Gelnar M.
Acta Parasitologica
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2012
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tom 57
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nr 2
Gyrodactylus malalai sp. nov. is described from the fin surface of cichlid fishes Oreochromis niloticus (L.) and Tilapia zillii (Gervais) caught in Lake Turkana (Kenya). The new species morphologically resembles Gyrodactylus nyanzae Paperna, 1973, but can be readily distinguished by the shape of the marginal hook sickles and the size of its hamuli. The sequence data of rDNA spanning partial 18S, internal transcribe spacer 1 and 2 and the 5.8S gene is unique within GenBank. Genetically, as most similar Gyrodactylus ergensi Přikrylová, Matějusová, Musilová et Gelnar, 2009 was found (97.5%). Moreover, a specimen of G. cichlidarum from O. niloticus, and a specimen G. ergensi from Sarotherodon galilaeus (L.) were collected during sampling in Kenya. Likewise, additional sampling of O. niloticus from the Blue Nile in Sudan revealed the presence of the newly described species. These findings represent the first records of gyrodactylids in both African countries.
8

Ieredactylus rivuli gen. et sp. nov. (Monogenea, Gyrodactylidae) from Rivulus hartii (Cyprinodontiformes, Rivulidae) in Trinidad

80%
Schelkle B., Paladini G., Shinn A. P., King S., Johnson M., van Oosterhout C., Mohammed R. S., Cable J.
Acta Parasitologica
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2011
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tom 56
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nr 4
A new genus and species of Gyrodactylidae, Ieredactylus rivuli gen. et sp. nov. (Platyhelminthes, Monogenea), is described from the skin of Hart’s Rivulus (Rivulus hartii Boulenger), a cyprinodontiform fish collected from streams of the Caroni and Oropouche drainages and the Pitch Lake in Trinidad (prevalence all localities: 16.7–94.6%; mean parasite intensity 1–9 parasites/fish; range 1–34) with the holotype originating from a tributary of the Aripo River. This viviparous monogenean is distinctive from other genera of Gyrodactylidae by its split ventral bar membrane, the shape of its male copulatory organ, the presence of two conical accessory pieces associated with the hamulus root and two differently shaped marginal hook sickles. Its unique rDNA sequence shows the closest ITS2 similarity (70%) to Gyrodactyloides andriaschewii Bychowsky et Poljansky, 1953. The presence of I. rivuli gen. et sp. nov. in the Pitch Lake indicates an adaptation to extreme environmental conditions such as high temperatures and hydrocarbons and adverse pH. Guppies may potentially serve as temporary hosts. The parasite displays distinct behaviours, including a characteristic ‘swimming-like’ movement. The ecology and phylogeny of I. rivuli gen. et sp. nov. is discussed in relation to the diversity of other gyrodactylids in Trinidad.
9

Gyrodactylids [Gyrodactylidae, Monogenea] infecting Oreochromis niloticus niloticus [L.] and O. mossambicus [Peters] [Cichlidae]: A pan-global survey

80%
Garcia-Vasquez A., Hansen H., Christison K. W., Rubio-Godoy M., Bron J. E., Shinn A. P.
Acta Parasitologica
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2010
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tom 55
|
nr 3
215-229
Gyrodactylus infections in intensively-reared populations of Nile tilapia, Oreochromis niloticus niloticus, have been associated world-wide with high mortalities of juvenile fish. In this study, 26 populations of Gyrodactylus parasitising either O. n. niloticus or Mozambique tilapia, Oreochromis mossambicus, were sampled from fourteen countries and compared with type material of Gyrodactylus cichlidarum Paperna, 1968, Gyrodactylus niloticus (syn. of G. cichlidarum) and Gyrodactylus shariffi Cone, Arthur et Bondad-Reantaso, 1995. Representative specimens from each population were bisected, each half being used for morphological and molecular analyses. Principal component analyses (PCA) identified five distinct clusters: (1) a cluster representing G. cichlidarum collected from O. n. niloticus from 13 countries; (2) the G. shariffi paratype; (3) three specimens with pronounced ventral bar processes collected from two populations of Mexican O. n. niloticus (Gyrodactylus sp. 1); (4) four specimens collected from an Ethiopian population nominally identified as O. n. niloticus (Gyrodactylus sp. 2); (5) nine gyrodactylids from South African O. mossambicus (Gyrodactylus sp. 3). Molecular analyses comparing the sequence of the ribosomal transcribed spacer regions (ITS 1 and 2) and the 5.8S gene from the non-hook bearing half of worms representative for each population and for each cluster of parasites, confirmed the presence of G. cichlidarum in most samples analysed. Molecular data also confirmed that the DNA sequence of Gyrodactylus sp. 2 and Gyrodactylus sp. 3 (the morphologically-cryptic group of South African specimens from O. mossambicus) differed from that of G. cichlidarum and therefore represent new species; no sequences were obtained from Gyrodactylus sp. 1. The current study demonstrates that G. cichlidarum is the dominant species infecting O. n. niloticus, being found in 13 of the 15 countries sampled.
10

Swimming in Gyrodactylus rysavyi [Monogenea, Gyrodactylidae] from the Nile catfish, Clarias gariepinus

80%
El-Naggar M. M., El-Naggar A. A., Kearn G. C.
Acta Parasitologica
|
2004
|
tom 49
|
nr 2
Gyrodactylus rysavyi, a monogenean parasite of the skin, fins and gills of the Nile catfish, Ciarias gariepinus, is capable of directional swimming when detached from the host and released in open water. The parasite propels itself by vigorously bending the body into a loop and then unbending the body with equal vigour. A typical Swimming phase lasts for 2-6 sec, involves between 4 and 8 looping/unlooping actions per sec and propels the parasite in any direction, including vertically upwards or downwards, at speeds of 1.7-5 mm/sec. The parasite is capable of swimming upwards for a distance of at least 15 cm. At the end of each swimming phase, the parasite sinks slowly, performing while it does so twisting and turning movements. The duration of this resting phase is similar to that of the swimming phase. A unique feature of the haptor of G. rysavyi is a posterior shift in the position of the 16 hooklets relative to the two large hamuli. The long handles of the hooklets radiate outwards, and like ribs support the fan-shaped posterior region of the haptor. This arrangement may be a specialization related to the adoption of looping and unlooping swimming movements, since the hooklet-supported fan is likely to provide most of the propulsion during swimming. Consideration is given to the possible role of swimming and the twisting and turning behaviour of the passively sinking parasite in the dispersal and transmission of G. rysavyi. The gyrodactylids Macrogyrodactylus congolensis and M. clarii, which also parasitize C. gariepinus, do not swim when detached from the substrate.
11

The first record of Macrogyrodactylus species [Monogenea, Gyrodactylidae] on freshwater fishes in Senegal with the description of Macrogyrodactylus simentiensis sp.nov., a parasite of Polypterus senegalus Cuvier

80%
Prikrylova I., Gelnar M.
Acta Parasitologica
|
2008
|
tom 53
|
nr 1
The first record of monogenean parasites of the genus Macrogyrodactylus Malmberg, 1957 on freshwater fish in Senegal is presented. Macrogyrodactylus congolensis Prudhoe, 1957 from the skin and Macrogyrodactylus heterobranchii N’Douba et Lambert, 1999 from the gills of Clarias anguillaris L. were found, representing new host records for these parasites. On Polypterus senegalus Cuvier, three Macrogyrodactylus species were identified, Macrogyrodactylus polypteri Malmberg, 1957, Macrogyrodactylus simentiensis sp. nov. and Macrogyrodactylus sp. M. simentiensis sp. nov. can be readily distinguished from the other Macrogyrodactylus species by the size of its hamuli and the shape of its marginal hook sickles. The marginal hooks on the anterolateral lobes of M. simentiensis differ in size and shape from those on the posterior margin of the haptor. Measurements and drawings of the haptoral sclerites of all five identified species are provided.
12

Identification of Gyrodactylus ectoparasites in Polish salmonid farms by PCR-RFLP of the nuclear ITS segment of ribosomal DNA [Monogenea, Gyrodactylidae]

80%
Rokicka M., Lumme J., Zietara M. S.
Acta Parasitologica
|
2007
|
tom 52
|
nr 3
The Gyrodactylus fauna of 274 fish taken from ten salmonid farms in Poland was sampled in 2006. Four fish species were investigated: rainbow trout Oncorhynchus mykiss, brown trout Salmo trutta (morphs fario, lacustris, and trutta), grayling Thymallus thymallus and huchen Hucho hucho. No parasites were observed on huchen. No indications of gyrodactylosis were observed, but an unexpected parasite species diversity was found. A molecular species identification by polymerase chain reaction (PCR) and restriction fragment length polymorphism (RFLP) of ITS1 + 5.8S + ITS2 was utilized, with addition of morphometric methods. The most frequent parasite was a new record in Poland, G. teuchis. It was present in two molecular forms on brown trout and rainbow trout, which also carried G. derjavinoides and G. truttae. Three molecular forms of G. salaris/G. thymalli were found, the standard type ITS only on grayling. A heterozygous (or heterogenic) G. salaris type described earlier in Denmark was found in seven farms on rainbow trout, and a complementary homozygous clone which differs from the standard by three nucleotides, in two farms. This homozygous form has not been recorded earlier. The PCR-RFLP results were confirmed by sequencing ITS segment from representative specimens of each type and comparing them with all available salmonid-specific Gyrodactylus sequences in GenBank. The Polish fauna with seven different Gyrodactylus clones separated by PCR-RFLP was the most diverse reported in fish farms in any country so far.
13

Gyrodactylus derjavinoides sp.nov. [Monogenea, Platyhelminthes] on Salmo trutta trutta L. and G.derjavini Mikailov, 1975 on S.t. caspius Kessler, two different species of Gyrodactylus - combined morphological and molecular investigations

80%
Malmberg G., Collins C. M., Cunningham C. O., Jalali B. J.
Acta Parasitologica
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2007
|
tom 52
|
nr 2
The paper deals with two morphologically similar but molecularly clearly different species of Gyrodactylus: G. derjavinoides sp. nov. on Salmo trutta trutta L. in Western Europe and G. derjavini Mikailov. 1975 collected on Salmo trutta caspius Kessler in Iran. The new species is described and its opisthaptoral hard parts compared to those of G. derjavini. Our molecular analysis of G. derjavinoides and G. derjavini confirmed that the morphological differences between them are species differences and not intraspecific variations. Phylogenetic analysis using the ITS rDNA region placed both species within the subgenus G. (Limnonephrotus) and within the G. wageneri-group, quite in accordance with morphological results. The two species, however, did not cluster as sister taxa. The correspondence between molecular-based clades within G. (Limnonephrotus) and the morphological shapes of marginal hooks within these clades are discussed. The importance of combined molecular and morphological analyses when describing or redescribing Gyrodactylus species is stressed.
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