The use of isozymes to identify specimens of Pomphorhynchus (Acanthocephala) in flounder, Platichthys flesus from the Baltic Sea

Chibani, M.; Glaiewska, I.; Rokicki, Jerzy

doi:10.1017/s0025315404009142h

Cited by 1 publication

(2 citation statements)

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“…A number of ecological, behavioural and biochemical studies have been carried out using the common Palaearctic species Pomphorhynchus laevis (Zoega in Müller, 1776) as a model, because it exhibits a broad geographical distribution and range of fish definitive hosts. However, a rather high morphological and physiological intraspecific variability has been reported in this species both in the British Islands (Kennedy et al, 1978;Kennedy, 1984;Brown, 1987;Guillén-Hernández & Whitfield, 2001;O'Mahony et al, 2004) and in continental Europe (Dudiňák & Šnábel, 2001;Chibani et al, 2004;Perrot-Minnot, 2004). These data have been then supplemented by the information on genetic characters, which indicated the existence of a cryptic species within the P. laevis species complex, notwithstanding the final fish host and/or geographic origin (Dudiňák & Šnábel, 2001;Králová-Hromadová et al, 2003;Perrot-Minnot, 2004, Bombarová et al, 2007.…”

Section: Introductionmentioning

confidence: 85%

“…Due to the fact that the most important differential featurethe shape of the hook bases -is visible only in live worms and due to the overall similarity of P. laevis and P. tereticollis, all acanthocephalans found in freshwater and brackish fishes throughout the Palaearctic region were considered to be the former species for a long time (e.g. Moravec & Scholz, 1991;Chibani et al, 2004;Kennedy, 2006). However, the present data allows us to confirm the (Køie, 1999;Køie, pers.…”

Section: Discussionmentioning

confidence: 99%

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Resurrection of Pomphorhynchus tereticollis (Rudolphi, 1809) (Acanthocephala: Pomphorhynchidae) based on new morphological and molecular data

2011

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Pomphorhynchus tereticollis (Rudolphi, 1809) is here redescribed on the basis of Rudolphi’s material, deposited in the Museum für Naturkunde Berlin, and on acanthocephalans recently collected from the type host Platichthys flessus (L.) and the region embodying the type locality. Out of the paratypes of P. tereticollis, the lectotype and paralectotypes have been designated. Their morphology fits well with that of newly collected material of P. tereticollis dissected from the type fish host from the Baltic coast near Stralsund. The resurrection of P. tereticollis, previously considered a synonym of Pomphorhynchus laevis (Zoega in Müller, 1779), is supported by several morphological features distinguishing the two Pomphorhynchus species: 1. The basal parts of the proboscis hooks located on the posterior proboscis half possess proximal projections in P. tereticollis but not in P. laevis. This shape of the hook bases is clearly visible only in unfixed fresh worms; 2. The last hooks are situated at the anterior part of the bulbus or rarely at the posterior-most end of the proboscis in P. tereticollis, while they lie anterior to the end of the proboscis in P. laevis; 3. The proboscis hooks No. 5 or 6 are markedly stout (robust) and clearly distinct in comparison with the surrounding hooks in P. tereticollis, while less robust and more similar to the hooks in P. laevis. In addition, genetic divergence between P. tereticollis and P. laevis based on ITS1, ITS2 and COI sequencing supports the existence of two distinct species and reveals that some isolates previously identified as P. laevis were actually P. tereticollis. Previous and present morphological and genetic data show that both Pomphorhynchus species occur in freshwaters throughout Europe and may infect the same fish hosts, such as chub and barbel, and also several species of isopods (Gammaridae). This study also provides morphological evidence that Pomphorhynchus intermedius Engelbrecht, 1957 is a synonym of P. tereticollis, because the only discrimination character of the former species, the “existing but small proximal projections of basal parts of the proboscis hooks located on the posterior proboscis half” are present also in P. tereticollis.

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