Suppression of the tapeworm order Pseudophyllidea (Platyhelminthes: Eucestoda) and the proposal of two new orders, Bothriocephalidea and Diphyllobothriidea

Kuchta, Roman; Scholz, Tomáš; Brabec, Jan; Bray, Rodney A.

doi:10.1016/j.ijpara.2007.08.005

Cited by 121 publications

(96 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Moreover, in some of these cyclophyllideans, such as Gallegoides arfaai and Mosgovoyia ctenoides, the electron-dense structures associated with centrioles are still present when the axonemes are already formed , Eira et al 2006. On the other hand, in the caryophyllideans, spathebothriideans and former "pseudophyllideans", recently subdivided into Bothriocephalidea and Diphyllobothriidea (Kuchta et al 2008), the electron-dense material is present only during the initial stages of spermiogenesis. According to BruÁanská and Poddubnaya (2006), this feature can be regarded as characteristic of the basal or "lower" cestode orders.…”

Section: Discussionmentioning

confidence: 99%

Ultrastructure of spermiogenesis in the caryophyllidean cestode Wenyonia virilis Woodland, 1923, with re-assessment of flagellar rotation in Glaridacris catostomi Cooper, 1920

Miquel

Świderski²,

Mackiewicz

et al. 2008

Acta Parasitologica

View full text Add to dashboard Cite

The ultrastructure of spermiogenesis in Wenyonia virilis Woodland, 1923, a caryophyllaeid cestode from the silurid Nile fish Synodontis schall (Bloch et Schneider, 1801), is described by means of transmission electron microscopy (TEM) for the first time. Spermiogenesis follows the characteristic caryophyllidean type and is initiated by the formation of a differentiation zone. This area, delimited at its base by a ring of arching membranes and bordered by cortical microtubules, contains two centrioles associated with typical striated rootlets with a reduced intercentriolar body between them. The apical area of the differentiation zone exhibits electron-dense material that is present only during the early stages of spermiogenesis. Only one of the centrioles develops into a free flagellum that grows at an angle of >90° in relation to the cytoplasmic extension. Spermiogenesis is also characterized by a flagellar rotation and a proximodistal fusion of the flagellum with the cytoplasmic extension. The most interesting features observed in W. virilis are the presence of a reduced, very narrow intercentriolar body and the unique type of flagellar rotation >90°. Results are compared with those described in two caryophyllideans, Glaridacris catostomi Cooper, 1920 and Khawia armeniaca (Cholodkovski, 1915). Contrary to the original report of OEwiderski and Mackiewicz (2002), that flagellar rotation has never been observed in spermiogenesis of G. catostomi, re-assessment of their description and illustrations leads us to conclude that flagellar rotation must logically occur in that species. The value of various morphological features of sperm in phylogenetic inference is discussed.

show abstract

Section: Discussionmentioning

confidence: 99%

Ultrastructure of spermiogenesis in the caryophyllidean cestode Wenyonia virilis Woodland, 1923, with re-assessment of flagellar rotation in Glaridacris catostomi Cooper, 1920

Miquel

Świderski²,

Mackiewicz

et al. 2008

Acta Parasitologica

View full text Add to dashboard Cite

show abstract

“…Photomicrographs were obtained in an Axiophot Zeiss bright field microscope. The taxonomic classification was based on Andersen and Gibson (1989) and Kuchta et al (2008), and the parasitological indexes were according to Bush et al (1997). A representative specimen of the cestode was deposited in the Coleção Helmintológica do Instituto Oswaldo Cruz (CHIOC), Rio de Janeiro, RJ.…”

Section: Diphyllobothriideamentioning

confidence: 99%

Cestodes Diphyllobothriidea parasitizing blackfin goosefish, Lophius gastrophysus Miranda-Ribeiro, 1915

Knoff¹,

Clemente

Fonseca³

et al. 2011

Arq. Bras. Med. Vet. Zootec.

View full text Add to dashboard Cite

show abstract

“…The genus Clestobothrium is included in the recent tapeworm order Bothriocephalidea, which had formerly been included in the suppressed order "Pseudophyllidea" (Kuchta et al 2008a). In their study Kuchta et al (2008a) showed that the order Pseudophyllidea consists of two unrelated clades using molecular, morphological, and ecological approaches.…”

Section: Introductionmentioning

confidence: 99%

“…In their study Kuchta et al (2008a) showed that the order Pseudophyllidea consists of two unrelated clades using molecular, morphological, and ecological approaches. The ultrastructural spermatological data available to date support these results and confirm the existence of important ultrastructural differences between the species of both orders (Levron et al 2005(Levron et al , 2006a(Levron et al ,b,c, 2009Bâ et al 2007;Šípková et al 2010.…”

Section: Introductionmentioning

confidence: 99%

Spermiogenesis and spermatozoon ultrastructure of the bothriocephalidean cestode Clestobothrium crassiceps (Rudolphi, 1819), a parasite of the teleost fish Merluccius merluccius (Gadiformes: Merlucciidae)

et al. 2011

View full text Add to dashboard Cite

Spermiogenesis and the ultrastructure of the spermatozoon of the bothriocephalidean cestode Clestobothrium crassiceps (Rudolphi, 1819), a parasite of the teleost fish Merluccius merluccius (Linnaeus, 1758), have been studied by means of transmission electron microscopy. Spermiogenesis involves firstly the formation of a differentiation zone. It is characterized by the presence of two centrioles associated with striated rootlets, an intercentriolar body and an electron-dense material in the apical region of this zone. Later, two flagella develop from the centrioles, growing orthogonally in relation to the median cytoplasmic process. Flagella then undergo a rotation of 90° until they become parallel to the median cytoplasmic process, followed by the proximodistal fusion of the flagella with the median cytoplasmic process. The nucleus elongates and afterwards it migrates along the spermatid body. Spermiogenesis finishes with the appearance of the apical cone surrounded by the single helical crested body at the base of the spermatid. Finally, the narrowing of the ring of arched membranes detaches the fully formed spermatozoon. The mature spermatozoon of C. crassiceps is filiform and contains two axonemes of the 9+"1" trepaxonematan pattern, a parallel nucleus, parallel cortical microtubules and electron-dense granules of glycogen. The anterior extremity of the gamete exhibits a short electron-dense apical cone and one crested body, which turns once around the sperm cell. The first axoneme is surrounded by a ring of thick cortical microtubules that persist until the appearance of the second axoneme. Later, these thick cortical microtubules disappear and thus, the mature spermatozoon exhibits two bundles of thin cortical microtubules. The posterior extremity of the male gamete presents only the nucleus. Results are discussed and compared particularly with the available ultrastructural data on the former "pseudophyllideans". Two differences can be stablished between spermatozoa of Bothriocephalidea and Diphyllobothriidea, the type of spermatozoon (II vs I) and the presence/absence of the ring of cortical microtubules.

show abstract

Suppression of the tapeworm order Pseudophyllidea (Platyhelminthes: Eucestoda) and the proposal of two new orders, Bothriocephalidea and Diphyllobothriidea

Cited by 121 publications

References 19 publications

Ultrastructure of spermiogenesis in the caryophyllidean cestode Wenyonia virilis Woodland, 1923, with re-assessment of flagellar rotation in Glaridacris catostomi Cooper, 1920

Ultrastructure of spermiogenesis in the caryophyllidean cestode Wenyonia virilis Woodland, 1923, with re-assessment of flagellar rotation in Glaridacris catostomi Cooper, 1920

Cestodes Diphyllobothriidea parasitizing blackfin goosefish, Lophius gastrophysus Miranda-Ribeiro, 1915

Spermiogenesis and spermatozoon ultrastructure of the bothriocephalidean cestode Clestobothrium crassiceps (Rudolphi, 1819), a parasite of the teleost fish Merluccius merluccius (Gadiformes: Merlucciidae)

Contact Info

Product

Resources

About