A New Gyrodactylid (Monogenea) Genus on Gray Bichir, Polypterus senegalus (Polypteridae) from Senegal (West Africa)

Abstract

Diplogyrodactylus martini n. g. et sp., a viviparous monogenean, is described from the gills of gray bichir Polypterus senegalus Cuvier, 1829, in Senegal. This new genus can be readily distinguished from the other described viviparous genera based on the morphology of the attachment apparatus. The haptor is equipped with a pair of centrally positioned hamuli, a simple ventral bar without membrane and 8 pairs of marginal hooks of 2 types, 5 pairs of hooks with well-defined large falculate sickles, and 3 pairs of smaller hooks with well-articulated sickles. The new genus is unique in having a teardrop-shaped muscular tubular male copulatory organ which lacks spines. A partial sequence of the internal transcribed spacer (ITS rDNA) was obtained from 4 specimens of D. martini. The relationship among D. martini and other genera of the Gyrodactylidae is discussed based on the similarities of the attachment apparatus.

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

“…Marginal hook shafts long and flexible compared to species of Gyrodactylus. Presence of two muscular pads adjacent to the hamuli, similar to the 'muscular adhesive disks' observed by Přikrylová et al (2009) Table I) Measurements for whole specimens and body parts are presented in Table I. Further, there are 8 pharynx processes and the male copulatory organ (MCO) is positioned off centre to the mid-line of the parasite and posterior to posterior pharyngeal bulb; armed with a principal spine and a single row of 8-10 smaller spines.…”

“…The family Gyrodactylidae currently includes 31 genera (Bakke et al 2007, Vianna et al 2007, Přikrylová et al 2009) but of these, sequences are only available for 7 genera. Thus the haplotype of the unknown species was aligned with the following sequences from GenBank: Acanthoplacatus sp.…”

“…Within the family Gyrodactylidae, Diplogyrodactylus martini, Macrogyrodactylus simentiensis Přikrylová et Gelnar, 2008, Gyrodactylus chologastris Mizelle, Whittaker et McDougal, 1969 and Gyrodactylus heterodactylus Rogers et Wellborn, 1965 have been reported as having two types of marginal hook sickles (Rogers and Wellborn 1965;Mizelle et al 1969;Přikrylová and Gelnar 2008;Přikrylová et al 2009), whilst Gyrodactylus milleri Harris et Cable, 2000 possesses three different marginal hook sickle morphologies (Rubio-Godoy et al 2010). Gyreteroncus spp.…”

Ultrastructure of musculature of the marginal hooklets of Macrogyrodactylus congolensis, a monogenean skin parasite from the catfish Clarias gariepinus

“…The author also suggested that the marginal hooklets may prevent the hamuli turning about their longitudinal axis and tearing free of the host skin. In the gyrodactylid monogenean Diplogyrodactylus martini, Přikrylová et al (2009) recorded eight pairs of marginal hooks of two types, five pairs with well-defined large sickles (= blades) and the other three pairs of smaller hooks with well-articulated smaller sickles. The authors suggested that the smaller articulated hooks which are similar to those of Gyrodactylus spp.…”

Description of Afrogyrodactylus ardae sp. n. (Monogenea: Gyrodactylidae) from Rhabdalestes septentrionalis (Characiformes: Alestidae) in the Niokolo-Koba National Park, Senegal

“…Thirty-fi ve years later, Mormyrogyrodactylus Luus-Powell, Mashego et Khalil, 2003 was described from Marcusenius macrolepidotus (Peters) (Luus-Powell et al, 2003). Most recently species of the genus Diplogyrodactylus Přikrylová, Matějusová, Musilová, Gelnar et Harris, 2009 were described from P. senegalus and Citharodactylus Přikrylová, Shinn et Paladini, 2017 from Citharinus citharus (Geoffroy Saint-Hilaire) (Přikrylová et al, 2009(Přikrylová et al, , 2017. The most speciose genus of Gyrodactylidae parasitising African fi shes is the cosmopolitan Gyrodactylus von Nordmann, 1832, currently with 36 species described from this continent (Zahradníčková et al, 2016, Přikrylová et al, 2017.…”