A New Genus of Tapeworm (Cestoda: Onchoproteocephalidea) from Sawfish (Elasmobranchii: Pristidae)

Caira, Janine N.; Jensen, Kirsten; Fyler, C. A.

doi:10.1645/17-165

Cited by 6 publications

(3 citation statements)

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“…in adults of Ligula intestinalis (Linnaeus, 1758), Diphyllobothrium lanceolatum (Krabbe, 1865) and on cirrus of D. latus [17, 20]. Uncinate spinitriches were observed on the cirrus of Matticestus anneae Caira, Jensen & Fyler, 2018 (Onchoproteocephalidae) [25] and on the apical part of plerocercoids (but not in adults) of Diphyllobothrium tetrapterum (von Siebold, 1848) by Hernández-Orts et al [24]. We can speculate which types were captured by Grammeltvedt [26], Kuperman [27] and Mustafina & Biserova [28] on plerocercoids of D. latus , D. dendriticus and Pyramicocephalus phocarum (Fabricius, 1780).…”

Section: Discussionmentioning

confidence: 99%

Complex insight on microanatomy of larval “human broad tapeworm” Dibothriocephalus latus (Cestoda: Diphyllobothriidea)

et al. 2019

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Background In Europe, the tapeworm Dibothriocephalus latus (syn. Diphyllobothrium latum ) is a well-known etiological agent of human diphyllobothriosis, which spreads by the consumption of raw fish flesh infected by plerocercoids (tapeworm’s larval stage). However, the process of parasite establishment in both intermediate and definitive hosts is poorly understood. This study was targeted mainly on the scolex (anterior part) of the plerocercoid of this species, which facilitates penetration of the parasite in intermediate paratenic fish hosts, and subsequently its attachment to the intestine of the definitive host. Methods Plerocercoids were isolated from the musculature of European perch ( Perca fluviatilis ) caught in Italian alpine lakes. Parasites were examined using confocal microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Immunofluorescence tagging was held on whole mount larvae. Results The organisation of the central and peripheral nervous system was captured in D. latus plerocercoids, including the ultrastructure of the nerve cells possessing large dense neurosecretory granules. Two types of nerve fibres run from the body surface toward the nerve plexus located in the parenchyma on each side of bothria. One type of these fibres was found to be serotoninergic and possessed large subtegumental nerve cell bodies. A well-developed gland apparatus, found throughout the plerocercoid parenchyma, produced heterogeneous granules with lucent core packed in a dense layer. Three different types of microtriches occurred on the scolex and body surface of plerocercoids of D. latus : (i) uncinate spinitriches; (ii) coniform spinitriches; and (iii) capilliform filitriches. Non-ciliated sensory receptors were observed between the distal cytoplasm of the tegument and the underlying musculature. Conclusions Confocal laser scanning microscopy and electron microscopy (SEM and TEM) showed the detailed microanatomy of the nervous system in the scolex of plerocercoids, and also several differences in the larval stages compared with adult D. latus. These features, i.e. well-developed glandular system and massive hook-shaped uncinate spinitriches, are thus probably required for plerocercoids inhabiting fish hosts and also for their post-infection attachment in the human intestine. Electronic supplementary material The online version of this article (10.1186/s13071-019-3664-8) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 99%

Complex insight on microanatomy of larval “human broad tapeworm” Dibothriocephalus latus (Cestoda: Diphyllobothriidea)

et al. 2019

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“…To date, the Onchoproteocephalidea II consists of 12 valid genera, with an estimated diversity of more than 1,154 species Jensen 2017, Caira et al 2018). Members of this order are known to exhibit an oioxenous host specificity, with each species infecting a single definitive host species (Caira et al 2018). They are, however, hosted by a wide range of elasmobranch groups, with the majority of species described to parasitise stingrays (Campbell and Beveridge 2002, Ivanov 2005, Fyler 2011, Maleki et al 2015.…”

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confidence: 99%

“…Although having a cosmopolitan distribution, the majority of records of onchoproteocephalideans from elasmobranchs were derived from species of Acanthobothrium van Beneden, 1849 in tropical and subtropical waters (Caira and Jensen 2014). Acanthobothrium is the species-richest genus of all elasmobranch-infecting cestode genera (Maleki et al 2015, Caira et al 2018. The genus is characterised by a scolex with four bothridia, each containing one pair of bi-pronged hooks.…”

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confidence: 99%

Four new species of Acanthobothrium van Beneden, 1849 (Cestoda: Onchoproteocephalidea) from the spotted skate, Raja straeleni Poll, off the Western Cape, South Africa

Spuy¹,

Smit²,

Schaeffner³

2020

FOLIA PARASIT

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Morphological and molecular identification of metacestodes infecting teleost fishes of Moreton Bay, Australia

Cutmore,

Bennett,

Cribb

2024

Syst Parasitol

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In a parasitological survey of fishes from Moreton Bay (southeastern Queensland, Australia), 169 teleost fishes, representing 54 species from 28 families, were examined for larval cestodes. Of these 54 species, 36 were found to be infected by metacestodes. Metacestodes were characterised by morphological and molecular data (the D1-D3 region of the 28S rDNA gene); these data were analysed in parallel to inform larval type allocation. Metacestodes collected represented eight morphological types, seven previously reported (Types I, II, IV, V, VI, VII, and X) and one novel type (Type XVI). Phylogenetic analyses were conducted to genetically match larval types to adult cestodes. Six of the eight larval types found were matched to adult forms: Type I metacestodes matched species of Phoreiobothrium Linton, 1889 (Onchobothriidae); Type II metacestodes matched species of Acanthobothrium van Beneden, 1849 (Onchobothriidae); Type IV metacestodes matched species of Scyphophyllidium Woodland, 1927 and Alexandercestus Ruhnke & Workman, 2013 (Phyllobothriidae); Type VI metacestodes matched species of Anthobothrium van Beneden, 1850 (Tetraphyllidea incertae sedis); Type X metacestodes matched species of Ambitalveolus Caira & Jensen, 2022 (Tetraphyllidea incertae sedis); and Type XVI metacestodes matched species of Platybothrium Linton, 1890 (Onchobothriidae). Based on phylogenetic topology, Type V metacestodes are inferred to match Pedibothrium Linton, 1909 (Balanobothriidae) and Type VII metacestodes are inferred to match Spongiobothrium Linton, 1889 (Rhinebothriidae). These findings support and extend the unified morphological type system proposed previously, but suggest that morphological types will ultimately be informative to identify metacestodes to a group of related genera rather than any distinct genus.

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A New Genus of Tapeworm (Cestoda: Onchoproteocephalidea) from Sawfish (Elasmobranchii: Pristidae)

Cited by 6 publications

References 23 publications

Complex insight on microanatomy of larval “human broad tapeworm” Dibothriocephalus latus (Cestoda: Diphyllobothriidea)

Complex insight on microanatomy of larval “human broad tapeworm” Dibothriocephalus latus (Cestoda: Diphyllobothriidea)

Four new species of Acanthobothrium van Beneden, 1849 (Cestoda: Onchoproteocephalidea) from the spotted skate, Raja straeleni Poll, off the Western Cape, South Africa

Morphological and molecular identification of metacestodes infecting teleost fishes of Moreton Bay, Australia

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