Spathebothriidea: survey of species, scolex and egg morphology, and interrelationships of a non-segmented, relictual tapeworm group (Platyhelminthes: Cestoda)&lt;sup&gt;*&lt;/sup&gt;

Kuchta, Roman; Pearson, Rebecca; Scholz, Tomáš; Ditrich, Oleg; Olson, Peter D.

doi:10.14411/fp.2014.040

Cited by 9 publications

(8 citation statements)

References 46 publications

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“…In contrast, these molecular phylogenetic studies show that at least three Archigetes species are members of the most recently diverging caryophyllidean lineage, which comprises almost entirely Nearctic caryophyllideans [ 50 ]. The available data thus support the hypothesis that the monoxenic life cycle of Archigetes is a secondary abbreviation of the developmental cycle, similar to some spathebothriideans, such as Cyathocephalus truncatus (Pallas, 1781), Diplocotyle olrikii Krabbe, 1874 or Spathebothrium simplex Linton, 1922, whose maturation and egg production may occur in gammarid amphipods as their intermediate host [ 20 , 35 , 46 ].…”

Section: Introductionsupporting

confidence: 55%

Archigetes Leuckart, 1878 (Cestoda, Caryophyllidea): diversity of enigmatic fish tapeworms with monoxenic life cycles

et al. 2022

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The caryophyllidean genus Archigetes Leuckart, 1878 is unique among all tapeworms in that its species can mature in invertebrate hosts (Oligochaeta), i.e., have a monoxenic (direct) life cycle. All five species were described as progenetic plerocercoids in oligochaetes and two of them also as adults from cypriniform fishes. Two species, A. sieboldi Leuckart, 1878 and A. iowensis Calentine, 1962, were found in North America in non-native common carp (Cyprinus carpio). A molecular study of caryophyllideans from the southern United States has revealed the occurrence of three new species in native freshwater fishes (Catostomidae, Ictiobinae): Archigetes loculotruncatus n. sp. from Ictiobus bubalus, I. niger and Carpiodes cyprinus is the largest representative of the genus and differs by a loculotruncate scolex. Archigetes megacephalus n. sp. from Ictiobus niger, I. bubalus and I. cyprinellus is characterised by a prominent, bothrioloculodiscate scolex. Archigetes vadosus n. sp. from I. bubalus is typified by a globular scolex with very shallow loculi; it differs from the closely related A. sieboldi in the shape of the body, with a distinct neck region and a scolex wider than the remaining body. Archigetes iowensis Calentine, 1962 becomes a junior synonym of Paraglaridacris limnodrili (Yamaguti, 1934). The generic diagnosis of Archigetes is amended and a key to identification of North American taxa is provided. Species of Archigetes and Paraglaridacris differ from each other most conspicuously in the structure of the ovary, which is follicular in Archigetes versus compact in Paraglaridacris.

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Section: Introductionsupporting

confidence: 55%

Archigetes Leuckart, 1878 (Cestoda, Caryophyllidea): diversity of enigmatic fish tapeworms with monoxenic life cycles

et al. 2022

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“…The present study has shown that the anterior suckerlike organ of the Gyrocotylidea is a closed muscular invagination of the body tegument with an apical pore and somewhat resembles the anterior attachment organ of the spathebothriidean C. truncatus and the diphyllobothriidean S. bisulcatus, which belongs among the earliest derived branched of 'true' tapeworms (Eucestoda) (Waechenbach et al 2012, Kuchta et al 2014. If the gyrocotylidean anterior sucker-like organ is an indication of the previous presence of a digestive system in ancient ancestors of the Gyrocotylidea, such an organ may have been modified into a sucker-like attachment organ of the Eucestoda during cestode evolution.…”

Section: Phylogenetic Remarksmentioning

confidence: 72%

“…Bandoni and Brooks (1987) compared the anterior end of species of Gyrocotyle with the mouth of monogeneans that is rarely encircled by an oral sucker unlike that of digeneans (Fried and Haseeb 1991). The anterior organ (or acetabulum, or anterior pit) of species of Gyrocotyle looks like the mouth of monogeneans or an attachment sucker-like organ of some evolutionary early divergent tapeworms that possess a single apical anterior sucker-like organ (Riggenbach 1899, Fried and Haseeb 1991, Olson and Caira 2001, Kuchta et al 2014.…”

Section: Anterior Organ Of the Gyrocotylideamentioning

confidence: 99%

“…Interestingly, an apical attachment sucker-like organ is also present in species of some cestode orders, such as the spathebothriidean Cyathocephalus truncatus (Pallas, 1781) from freshwater teleosts, the diphyllobothriidean Scyphocephalus bisulcatus Riggenbach, 1899 from reptiles, and, species of the order Lithobothriidea, parasites of elasmobranchs (Riggenbach 1899, Olson and Caira 2001, Kuchta et al 2014.…”

Section: Anterior Organ Of the Gyrocotylideamentioning

confidence: 99%

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Ultrastructure of the anterior organ and posterior funnel-shaped canal of Gyrocotyle urna Wagener, 1852 (Cestoda: Gyrocotylidea)

Poddubnaya¹,

Kuchta²,

Bristow³

et al. 2015

Folia Parasitologica

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Using scanning and transmission electron microscopy, ultrastructure of the anterior organ and posterior funnel-shaped canal of Gyrocotyle urna Wagener, 1852 (Cestoda: Gyrocotylidea) from ratfish, Chimaera monstrosa (Holocephali), was studied for the first time. The proper anterior organ is localised at a short distance (about 170 µm) from an apical pore surrounded by a receptor field, whereas its distal end is marked by a muscular sphincter. The tegumental surface of this organ is covered with short filitriches of irregular length; large area of muscle layers traverse beneath the tegumental layer. The funnel-shaped canal of G. urna (2.5-3.0 mm long) is a specialised, muscular part of the posterior attachment organ; it opens on the rounded elevation on the dorsal body surface. The tegumental layer bears conical sclerite-like structures (up to 1.5 µm long). It produces electron-dense bodies that are transported into a canal lumen and surrounded thick muscle area mixed with numerous nerve fibres. The present ultrastructural study of G. urna indicates that gyrocotylideans share some ultrastructural characters of the anterior organ with spathebothriidean cestodes with a single anterior attachment sucker-like organ. In contrast, the unique posterior rosette attachment organ with funnel-shaped canal of the Gyrocotylidea resembles the haptor of polyopisthocotylean monogeneans in its position at the posterior end of the body and presumed origin. The above-mentioned features add more clarity to support the basal position of the Gyrocotylidea Poche, 1926 among cestodes. In addition, they also indicate a possible relationship of gyrocotylidean ancestors with monogeneans.

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“…Phylogenetic interrelationships have been studied by Kuchta et al . (2014), and the most basal species seems to be the marine Spathebothrium simplex with a simple scolex without specialized attachment organs.…”

Section: Remarkable Achievementsmentioning

confidence: 99%

Fish tapeworms (Cestoda) in the molecular era: achievements, gaps and prospects

Scholz

Kuchta

2022

Parasitology

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The tapeworms of fishes (Chondrichthyes and Actinopterygii) account one-third (1670 from around 5000) of the total tapeworm (Platyhelminthes: Cestoda) species diversity. In total 1186 species from 9 orders occur as adults in elasmobranchs (sharks, rays and chimaeras), and 484 species from 8 orders mature in ray-finned fishes (referred to here as teleosts). Teleost tapeworms are dominated by freshwater species (78%), but only 3% of elasmobranch tapeworms are known from freshwater rays of South America and Asia (Borneo). In the last 2 decades, vast progress has been made in understanding species diversity, host associations and interrelationships among fish tapeworms. In total, 172 new species have been described since 2017 (149 from elasmobranchs and 23 from teleosts; invalidly described taxa are not included, especially those from the Oriental region). Molecular data, however, largely limited to a few molecular markers (mainly 28S rDNA, but also 18S and cox1), are available for about 40% of fish tapeworm species. They allowed us to significantly improve our understanding of their interrelationships, including proposals of a new, more natural classification at the higher-taxonomy level (orders and families) as well as at the lower-taxonomy level (genera). In this review, we summarize the main advances and provide perspectives for future research.

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Spathebothriidea: survey of species, scolex and egg morphology, and interrelationships of a non-segmented, relictual tapeworm group (Platyhelminthes: Cestoda)<sup>*</sup>

Cited by 9 publications

References 46 publications

Archigetes Leuckart, 1878 (Cestoda, Caryophyllidea): diversity of enigmatic fish tapeworms with monoxenic life cycles

Archigetes Leuckart, 1878 (Cestoda, Caryophyllidea): diversity of enigmatic fish tapeworms with monoxenic life cycles

Ultrastructure of the anterior organ and posterior funnel-shaped canal of Gyrocotyle urna Wagener, 1852 (Cestoda: Gyrocotylidea)

Fish tapeworms (Cestoda) in the molecular era: achievements, gaps and prospects

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