Redescription d’Acanthocheilus rotundatus(Ascaridoidea, Nematoda), parasite de requins (Pleurotremata, Selachii). Considérations sur les affinités du genreAcanthocheiluset conclusions taxonomiques

Ribosomal DNA and Phylogeny of the Ascaridoidea (Nemata: Secernentea): Implications for Morphological Evolution and Classification

“…Nematodes of the superfamily Ascaridoidea (Secernentea: Ascaridida) have been studied extensively with respect to alpha-taxonomy (e.g., Davey, 1971;Sprent, 1977Sprent, , 1978Sprent, , 1979Overstreet, 1979, 1981;Fagerholm and Gibson, 1987;Bruce and Cannon, 1990;Petter et al, 1991;Bruce et al, 1994), morphology (Snyder, 1985(Snyder, , 1989Fagerholm, 1989Fagerholm, , 1991Hugot et al, 1991;De and Dey, 1992), life cycles (Huizinga, 1967;Klöser et al, 1992;Køie and Fagerholm, 1995), geographic and host distribution (Fagerholm, 1988;Brattey and Ni, 1992;Bristow and Berland, 1992;Jensen et al, 1994), population genetic structure (Paggi et al, 1991;Anderson et al, 1993;Nascetti et al, 1993;Nadler, 1996), and host pathogenesis (Deardorff and Overstreet, 1980;Overstreet and Meyer, 1981). Many species, as juveniles or adults, are potential causative agents of disease in humans, domesticated animals, and wildlife (Beaver, 1956;Norris and Overstreet, 1976;Kazacos, 1986).…”

Metazoan parasite community as a potential biological indicator in juveniles of the starry smooth-houndMustelus asteriasCloquet, 1819 (Carcharhiniformes Triakidae)

“…Excepted for Myxozoa (myxosporean cysts), all the 609 metazoan parasites found were numbered per organ and per fish, and then morphologically identified. Morphological identification referred to Price (1942) for Monogenea; Curran and Overstreet (2000) and Gibson et al (2001) for Digenea; Barker et al (1984), Khalil et al (1994), Ruhnke (2011), Palm and Walter (2000), Ruhnke and Caira (2009), Schaeffner (2014) and Bernot et al (2016) for Cestoda; Petter et al (1991), Moravec et al (2002) and Anderson et al (2009) for Nematoda; Lom and Dyková (2006) for Myxozoa; and Isawa (2008) for Copepoda. Some nematode specimens (i.e., Achanthocheilus rotundatus and Proleptus obtusus) were preserved in 70% ethanol for molecular identification to validate morphological identification (see below).…”

“…(Ruhnke, 2011); Symcallio leuckarti (Bernot et al, 2016). The other parasite taxa are a priori new records for M. asterias, previously registered in the closely related M. mustelus (Acanthocheilus rotundatus, Eutetrarhynchus sp., Ptychogonimus megastomum) (Petter et al, 1991;Gračan et al, 2014) and Mustelus manazo (Orygmatobothrium sp.) (Yamaguchi et al, 2003), apart from the unknown Myxosporea.…”

“…The most prevalent species (75%) is the nematode A. rotundatus, which is a priori a first record for M. asterias. This dominant species is widely distributed (North Sea, Adriatic Sea, Mediterranean Sea, North Pacific Ocean) and occurred in closely related species such as M. mustelus, Mustelus griseus, M. manazo and G. galeus (Diaz, 1971;Petter et al, 1991;Moravec and Nagasawa, 2000;Yamaguchi et al, 2003). The two-host life cycle comprises the hermit crab Pagurus prideauxi as intermediate host ingested by the elasmobranch definitive host (Diaz, 1971).…”