Systematic Parasitology

, Volume 15, Issue 1, pp 41–63 | Cite as

Some ascaridoid nematodes of fishes: Paranisakis and Mawsonascaris n. g.

  • J. F. A. Sprent


As a result of examination of type-material and other specimens representing species previously assigned to Paranisakis Baylis, 1923, it is proposed that this genus be reduced to one species, namely P. squatinae Baylis, 1923. The other species are distributed as follows: pastinacae Rudolphi, 1819, australis Johnston & Mawson, 1943 and laymani Mozgovoy, 1950 are assigned to a new genus Mawsonascaris. The main features differentiating Mawsonascaris from Paranisakis are: dentigerous ridges on the lips (absent in Paranisakis), digitiform extensions of the labial pulp (absent in Paranisakis), excretory pore posterior to the nerve-ring (anterior to the nerve-ring in Paranisakis) and long filiform spicules (short and stout in Paranisakis). The following new host records are reported: Rhinobatos cemiculus for P. squatinae; and Aptychotrema banksii, Rhinobatos batillum, Rhynchobatus dijddensis and Taeniura lymma for M. australis. Specimens were not available from teleosts. It is considered that the proposal of Yamaguti (1961) to raise the subgenus Ortoanisakis Mozgovoy, 1951 to full generic status be upheld provisionally, Ortoanisakis containing species from teleosts, formerly in Paranisakis, but described as having no dentigerous ridges and no gubernaculum. These include O. lophii (Yamaguti, 1935), O. halieutaeae (Yamaguti 1941), O. muraenesocis (Yamaguti, 1935), O. lophii hoplobrotulae (Yamaguti, 1941) and O. sciaenae Khan & Begum, 1971. The remaining species formerly in Paranisakis are relegated to the status of species inquirendae.


Excretory Pore Ejaculatory Duct Excretory System Intestinal Caecum Oesophageal Gland 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • J. F. A. Sprent
    • 1
  1. 1.Department of ParasitologyUniversity of QueenslandBrisbaneAustralia

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