Wednesday, April 22, 2020

[Invertebrate • 2020] Pseudorhabdosynochus kasetsartensis (Monogenea: Diplectanidae) from the Cloudy Grouper Epinephelus erythrurus (Valenciennes) (Perciformes: Serranidae) in the lower Gulf of Thailand

Pseudorhabdosynochus kasetsartensis 
Saengpheng & Purivirojkul, 2020

Pseudorhabdosynochus kasetsartensis n. sp. is described from the gills of the cloudy grouper Epinephelus erythrurus (Valenciennes) caught in the lower Gulf of Thailand. The new species is distinguished from other species assigned to the genus by the structure of its sclerotised vagina which has a wide and prominent sclerotised trumpet, long, thin, coiled or curved primary canal, short secondary canal, and primary and secondary chambers that are blind extremities of the primary and secondary canals, respectively. This is the first species of Pseudorhabdosynochus Yamaguti, 1958 described from E. erythrurus and the first record of a species of Pseudorhabdosynochus in Thailand.

Pseudorhabdosynochus kasetsartensis n. sp.
A, Composite drawing (mainly from the holotype), ventral view; B, Male quadriloculate organ, ventral view; C, Sclerotised vagina, ventral view; D, Dorsal hamulus; E, Ventral hamulus; F, Dorsal bar; G, Ventral bar; H, Squamodisc.
 Scale-bars: A, 200 µm; B–H, 50 µm

Pseudorhabdosynochus kasetsartensis n. sp.

Type-host: Epinephelus erythrurus (Valenciennes) (Perciformes: Serranidae).

Type-locality: The lower Gulf of Thailand (...), October 2018.

Site in host: Gills.

Prevalence and intensity: 100% (30/30); mean intensity: 38 individuals/fish (1,140/30).

Etymology: The species name honors Kasetsart University and the Kasetsart University Research and Development Institute, the institute that has funded our aquatic parasitology studies for many years.

Chompunooch Saengpheng and Watchariya Purivirojkul. 2020. Pseudorhabdosynochus kasetsartensis n. sp. (Monogenea: Diplectanidae) from the Cloudy Grouper Epinephelus erythrurus (Valenciennes) (Perciformes: Serranidae) in the lower Gulf of Thailand. Systematic Parasitology. 97(1); 99–106.  DOI:  10.1007/s11230-019-09899-z