Presence of Genital Spines in a Male Corynosoma cetaceum Johnston and Best, 1942 (Acanthocephala)

Aznar, Francisco Javier; Beron-Vera, B.; Crespo, E. A.; Raga, J. A.

doi:10.2307/3285597

Cited by 2 publications

(4 citation statements)

References 8 publications

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“…In a recent paper, Aznar et al (2002a) found one of 80 males of C. cetaceum from two specimens of D. delphis off Patagonia as having two small spines adjacent to the genital pore and isolated from the somatic spines; they stated that this finding confirmed the reassignment of C. cetaceum to Corynosoma (see Aznar et al, 1999a). However, the presence of only one male having genital spines in over 3,000 males examined from different host in several regions (Aznar et al, 2002a) suggests that it cannot be taken as a reliable diagnostic feature at the generic level. This, however, does not preclude C. cetaceum from Corynosoma, because some species from marine mammals, which lack genital spines in both sexes, are included within Corynosoma, e.g.…”

Section: Locusmentioning

confidence: 73%

“…cetaceum has commonly been reported as a parasite of the franciscana Pontoporia blainvillei Gervais & D'Orbigny off the Uruguayan (Schmidt & Dailey, 1971;Kagei et al, 1976;Aznar et al, 1994a) and Argentinian coasts (Aznar et al, 1994a, b), and from the short beaked common dolphin Delphinus delphis Linnaeus off Argentina (Aznar et al, 2002a). Unidentified species of this genus have also been reported from P. blainvillei (see Dailey & Brownell, 1972).…”

Section: Introductionmentioning

confidence: 94%

“…Therefore, using a less restricted definition of a genital spine, P. cetaceum was retained as C. cetaceum by Aznar et al (1999a) and sustained by Aznar et al (2002a). This problem appears to arise from the definition of a genital spine based only on its position relative to the genital opening (see Aznar et al, 1999a) and without consideration of genital and somatic spine morphology.…”

Section: Locusmentioning

confidence: 99%

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Corynosoma australe Johnston, 1937 and C. cetaceum Johnston & Best, 1942 (Acanthocephala: Polymorphidae) from marine mammals and fishes in Argentinian waters: allozyme markers and taxonomic status

et al. 2005

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Genetic and morphological studies were carried out on acanthocephalans belonging to Corynosoma Lühe, 1904 and referable to the species C. cetaceum Johnston & Best, 1942 and C. australe Johnston, 1937, which were recovered from both definitive and intermediate hosts in Argentinian waters. The aims were to estimate the level of genetic differentiation between the two taxa at any stage of their life-cycle, to provide genetic (allozyme) markers for their recognition and to analyse the systematic status of both taxa. Acanthocephalans were collected from the stomach and intestine of Arctocephalus australis (Zimmerman), the intestine of Mirounga leonina (Linnaeus) and the stomach of Pontoporia blainvillei Gervais & D'Orbigny (definitive hosts) in Argentinian waters. Alternative alleles at all the 13 enzymatic loci studied were observed for C. australe and C. cetaceum. The specimens from the stomach of both P. blainvillei and A. australis were identified, on the basis of the great number of diagnostic loci found, as C. cetaceum; those from intestine of both A. australis and M. leonina as C. australe. A high level of genetic differentiation (D(Nei)=infinity: I(Nei)=0.00) between the two taxa was found, suggesting a generic distinction between the two species. Cystacanths of the two species from the body-cavity of the fish Cynoscion guatucupa (Cuvier) collected from the same geographical area were identified genetically. Morphological patterns, such as the number of hooks and hook rows on the proboscis, the distribution of somatic and genital armature, and other morphometric and meristic differences, in addition to ecological data, enabled the identification of these two species at cystacanth, juvenile and adult stages. However, a number of morphological and morphometric features of the Argentinian material were different to those of C. australe and C. cetaceum described from other regions of the world.

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Section: Locusmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 94%

Section: Locusmentioning

confidence: 99%

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Corynosoma australe Johnston, 1937 and C. cetaceum Johnston & Best, 1942 (Acanthocephala: Polymorphidae) from marine mammals and fishes in Argentinian waters: allozyme markers and taxonomic status

et al. 2005

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“…The fact that a member of Corynosoma is unable to mature in pinnipeds is rather exceptional (Aznar et al , 2006), and adds to the long-standing controversy as to the generic status of C. cetaceum . Morphological data strongly suggest that C. cetaceum is a member of Corynosoma (Aznar et al , 1999, 2002, 2006), whereas molecular data raise the possibility that it may belong to another genus (García-Varela et al , 2005; Sardella et al , 2005).…”

Section: Discussionmentioning

confidence: 99%

Assessing host–parasite specificity through coprological analysis: a case study with species of Corynosoma (Acanthocephala: Polymorphidae) from marine mammals

et al. 2011

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In this paper we report an investigation of the utility of coprological analysis as an alternative technique to study parasite specificity whenever host sampling is problematic; acanthocephalans from marine mammals were used as a model. A total of 252 scats from the South American sea lion, Otaria flavescens, and rectal faeces from 43 franciscanas, Pontoporia blainvillei, from Buenos Aires Province, were examined for acanthocephalans. Specimens of two species, i.e. Corynosoma australe and C. cetaceum, were collected from both host species. In sea lions, 78 out of 145 (37.9%) females of C. australe were gravid and the sex ratio was strongly female-biased. However, none of the 168 females of C. cetaceum collected was gravid and the sex ratio was not female-biased. Conversely, in franciscanas, 14 out of 17 (82.4%) females of C. cetaceum were gravid, but none of 139 females of C. australe was, and the sex ratio of C. cetaceum, but not that of C. australe, was female-biased. In putative non-hosts, the size of worms was similar to that from specimens collected from prey. Results suggest that both acanthocephalans contact sea lions and franciscanas regularly. However, C. australe and C. cetaceum cannot apparently reproduce, nor even grow, in franciscanas and sea lions, respectively. Coprological analysis may represent a useful supplementary method to investigate parasite specificity, particularly when host carcasses are difficult to obtain.

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Presence of Genital Spines in a Male Corynosoma cetaceum Johnston and Best, 1942 (Acanthocephala)

Cited by 2 publications

References 8 publications

Corynosoma australe Johnston, 1937 and C. cetaceum Johnston & Best, 1942 (Acanthocephala: Polymorphidae) from marine mammals and fishes in Argentinian waters: allozyme markers and taxonomic status

Corynosoma australe Johnston, 1937 and C. cetaceum Johnston & Best, 1942 (Acanthocephala: Polymorphidae) from marine mammals and fishes in Argentinian waters: allozyme markers and taxonomic status

Assessing host–parasite specificity through coprological analysis: a case study with species of Corynosoma (Acanthocephala: Polymorphidae) from marine mammals

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