Systematic Parasitology

, Volume 91, Issue 3, pp 191–201 | Cite as

Acanthocercodes n. g. (Monogenoidea: Diplectanidae) for species parasitising threadfins (Perciformes: Polynemidae), with description of Acanthocercodes bullardi n. sp. from the Atlantic threadfin Polydactylus octonemus (Girard) and reassignment of three species of Diplectanum Monticelli, 1903 from the Indo-Pacific Ocean

  • Delane C. Kritsky
  • Ben K. Diggles


Acanthocercodes n. g. (Diplectanidae) is proposed for Acanthocercodes bullardi n. sp. and three previously described species of Diplectanum all parasites of the gill lamellae of threadfins (Perciformes: Polynemidae). The new genus is characterised by species having peduncular spines composed of an anteriorly directed point and a flattened base from which an anterior root arises. Members of the genus lack auxiliary spinous or sucker-like structures in the haptor. Acanthocercodes bullardi n. sp. is described from the Atlantic threadfin, Polydactylus octonemus (Girard), in the Gulf of Mexico off Louisiana, USA. Diplectanum polynemus Tripathi, 1957 is redescribed and transferred to Acanthocercodes as A. polynemus (Tripathi, 1957) n. comb. based on specimens collected from the fourfinger threadfin, Eleutheronema tetradactylum (Shaw), from the mouth of the River Adelaide, Northern Territory, Australia. Diplectanum spinosum (Maillard & Vala, 1980) (= Pseudodiplectanum spinosum Maillard & Vala, 1980) and Diplectanum megacirrus (Maillard & Vala, 1980) (= Pseudodiplectanum megacirrus Maillard & Vala, 1980) from the lesser African threadfin, Galeoides decadactylus (Bloch), are transferred to Acanthocercodes as A. spinosum (Maillard & Vala, 1980) n. comb. and A. megacirrus (Maillard & Vala, 1980) n. comb., respectively.


Male Copulatory Organ Body Midline Intestinal Caecum Queensland Museum Ventral Anchor 
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Sincere gratitude is extended to Dr. Stephen A. (Ash) Bullard, Auburn University, for allowing the senior author to accompany collecting excursions during his field ichthyology course offered at the Gulf Coast Research Laboratory during August, 2011; Dr. Robin Overstreet, Gulf Coast Research Laboratory, for providing living quarters and some supplies for the senior author during the visit; Dr. Jean-Lou Justine, Muséum national d’Histoire naturelle, Paris, France, for allowing the examination of the type-specimens of P. megacirrus and P. spinosum; and Dr. Walter A. Boeger, Universidade Federal do Paraná, Curitiba, Paraná, Brazil, for frequent consultation concerning the taxonomic position of Acanthocercodes bullardi within the Diplectanidae. The authors gratefully acknowledge the following for assistance during field collections: Kate Hutson, School of Marine and Tropical Biology, James Cook University, Townsville, Queensland; Will Macbeth, Lachlan Barnes, and other field staff from Cardno; and Quentin Allsop, Wayne Baldwin, Chris Errity, and other field staff from the Northern Territory Fisheries. Field sampling for the polynemid and its helminths from the Adelaide River, Australia, was undertaken by DigsFish Services under contract to Cardno as part of the Nearshore Environmental Monitoring Program for the Ichthys LNG Project.

Conflict of interest

The authors declare that they have no conflict of interest.

Compliance with ethical standards

All applicable institutional, national and international guidelines for the care and use of animals were followed.


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© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  1. 1.Health Education Program, School of Health Professions, Campus Box 8090Idaho State UniversityPocatelloUSA
  2. 2.DigsFish Services Pty Ltd.Banksia BeachAustralia

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