Paragyrodactylus variegatus n. sp. (Monogenea: Gyrodactylidae) is described from the fins and body surface of Homatula variegata (Dabry de Thiersant, 1874) living in cold-water streams in the Qinling Mountains of central China. It represents the third known species in the genus, with all species parasitizing Asian river loaches (Cypriniformes: Nemacheilidae). The new species resembles most closely Paragyrodactylus iliensis Gvosdev and Martechov, 1953 , but is diagnosed by its marginal hooks being longer than 19 μm, a sickle longer than 4 μm, a sickle aperture shorter than the sickle distal width, and absence of a ventromedial indentation in the haptoral accessory hard part. Scanning electron microscopy reveals a central foramen in the haptoral accessory hard part, and small knob-like protuberances on the heel and toe of the marginal hook sickle. A partial 18S (448 bp) and complete ITS-1, 5.8S, and ITS-2 (1,139 bp) rDNA sequences are provided. A preliminary phylogenetic analysis based on the partial 18S gene, which included all sequenced genera of the Gyrodactylidae, suggests P. variegatus n. sp. is basal within Gyrodactylus sensu lato. It is proposed that the genus is a relict freshwater lineage parasitizing river loaches in the mountain plateaus of central Asia.
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http://dx.doi.org/10.1645/13-257.1 | DOI Listing |
PLoS One
June 2020
College of Life Sciences, Shaanxi Normal University, Xi'an, Shaanxi, China.
In this study, two parasites on the fins of Homatula variegata were recorded from March to September 2016. A dissection mirror was used to examine the distribution and quantity of the ectoparasitic Gyrodactylus sp. and Paragyrodactylus variegatus on the host Homatula variegata in different seasons.
View Article and Find Full Text PDFParasit Vectors
May 2016
Laboratório de Ecologia Molecular e Parasitologia Evolutiva-LEMPE, Universidade, Federal do Paraná-UFPR, Curitiba, Brazil.
Background: The rather species-poor oviparous gyrodactylids are restricted to South America. It was suggested that they have a basal position within the otherwise viviparous Gyrodactylidae. Accordingly, it was proposed that the species-rich viviparous gyrodactylids diversified and dispersed from there.
View Article and Find Full Text PDFParasit Vectors
August 2014
Co-Innovation Center for Qinba regions' sustainable development, College of Life Science, Shaanxi Normal University, Xi'an 710062, China.
Background: Paragyrodactylus Gvosdev and Martechov, 1953, a viviparous genus of ectoparasite within the Gyrodactylidae, contains three nominal species all of which infect Asian river loaches. The group is suspected to be a basal lineage within Gyrodactylus Nordmann, 1832 sensu lato although this remains unclear. Further molecular study, beyond characterization of the standard Internal Transcribed Spacer region, is needed to clarify the evolutionary relationships within the family and the placement of this genus.
View Article and Find Full Text PDFJ Parasitol
June 2014
College of Life Science, Shaanxi Normal University, Xi'an, 710062, China.
Paragyrodactylus variegatus n. sp. (Monogenea: Gyrodactylidae) is described from the fins and body surface of Homatula variegata (Dabry de Thiersant, 1874) living in cold-water streams in the Qinling Mountains of central China.
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