Dichelyne (Cucullanellus) romani n. sp (Nematoda: Cucullanidae) in notacanthid fishes from the Northeast Atlantic and Western Mediterranean

A new cucullanid, Dichelyne (Cucullanellus) romani n. sp. (Nematoda: Cucullanidae), is described from the digestive tract of two notacanthid fishes, Notacanthus chemnitzii Bloch and N. bonaparte Risso (Notacanthiformes: Notacanthidae), from the Northeast Atlantic and Western Mediterranean. The prese...

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Bibliographic Details
Published in:Systematic Parasitology
Main Authors: Isbert, W., Esteban Montero, F., Carrasson, M., González-Solís, D. (David)
Format: Article in Journal/Newspaper
Language:English
Published: 2015
Subjects:
ribosomal dna
marine fishes
pisces
sea
Ascaridoidea
Sciaenidae
morphology
tornquist
parasites
Mexico
Bonaparte
Northeast Atlantic
Online Access:https://doi.org/10.1007/s11230-015-9556-1
http://hdl.handle.net/11104/0269907
Description
Summary:A new cucullanid, Dichelyne (Cucullanellus) romani n. sp. (Nematoda: Cucullanidae), is described from the digestive tract of two notacanthid fishes, Notacanthus chemnitzii Bloch and N. bonaparte Risso (Notacanthiformes: Notacanthidae), from the Northeast Atlantic and Western Mediterranean. The presence of a precloacal sucker and ten pairs of caudal papillae in males allocates it to the subgenus Cucullanellus Tornquist, 1931. The new species differs from other members of this subgenus in its larger body size, smaller spicule/body length ratio, the distribution of caudal papillae, and the position of deirids and excretory pore. Both notacanthid fishes act as definitive hosts with slightly larger nematode specimens detected in N. chemnitzii. A wide intraspecific variability was found in the distribution of caudal papillae, and in some specimens the position of deirids, excretory pore and length of intestinal caecum also varied. A complete list of all assigned species of the subgenus Cucullanellus is presented and discussed as there are several uncertainties regarding the validity and synonymy of some species. This is the first species of Dichelyne Jagerskiold, 1902 in a notacanthid fish and one of the only two records in deep-sea fish species.

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